Newport City Council
Newport Local Flood Risk Management
Flood Risk Management Plan
Issue | 14 December 2015
This report takes into account the particular
instructions and requirements of our client.
It is not intended for and should not be relied
upon by any third party and no responsibility
is undertaken to any third party.
Job number 244494-00
4 Pierhead Street
Capital Waterside
Cardiff CF10 4QP
United Kingdom
www.arup.com
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Document Verification
Job title Newport Local Flood Risk Management Job number
244494-00
Document title Flood Risk Management Plan File reference
4-50
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Revision Date Filename Newport FRMP Draft Report.docx
Draft 1 17 Jul
2015
Description First draft, circulated for comment.
Prepared by Checked by Approved by
Name Jenna Beckett Robin Campbell David Hetherington
Signature
Draft 2 9 Oct
2015
Filename Newport FRMP Draft Report.docx Description Updated Section 7 onwards, and additional information
provided by Newport City Council for Sections 1 – 6, draft
circulated for comment.
Prepared by Checked by Approved by
Name Rosemary Cripps Robin Campbell Catherine Wenger
Signature
Draft 3 9 Oct
2015
Filename Newport FRMP Draft Report Draft 3.docx Description Updated to reflect Newport City Council’s and Dŵr Cymru
Welsh Water’s comments.
Prepared by Checked by Approved by
Name Rosemary Cripps Robin Campbell Catherine Wenger
Signature
Issue 14 Dec
2015 Filename Newport FRMP Draft Report_Issue for Consultation.docx
Description Issue for stakeholder consultation
Prepared by Checked by Approved by
Name Rosemary Cripps Robin Campbell Catherine Wenger
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Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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Contents
Page
List of Acronyms 5
Synopsis 6
1 Introduction 7
2 Purpose of Flood Risk Management Plans in managing flood risk 8
2.1 What is a Flood Risk Management Plan? 8
2.2 What is included in this Plan? 8
2.3 Legislative Context 10
3 Study area 14
3.1 Administrative area 14
3.2 Local flood risk in Newport 21
3.3 Approach to high-level costing of measures 25
4 How Newport City Council currently manages flood risk 26
4.2 How Newport City Council prioritises their work 29
4.3 Who Newport City Council works with to manage flood risk 30
4.4 How this FRMP has been coordinated 31
4.5 Measures already underway to manage flood risk 32
5 Coordination with the Severn River Basin Management Plans 34
6 Newport Flood Risk Management Plan objectives 38
7 How Newport City Council will manage flood risk at a local level 40
7.1 Overview of local flood risk 40
7.2 Common local flood risk management measures 51
7.3 Allt-Yr-Yn Ward 56
7.4 Alway Ward 61
7.5 Beechwood Ward 66
7.6 Bettws Ward 71
7.7 Caerleon Ward 76
7.8 Gaer Ward 81
7.9 Graig Ward 86
7.10 Langstone Ward 91
7.11 Liswerry Ward 97
7.12 Llanwern Ward 102
7.13 Malpas Ward 107
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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7.14 Marshfield Ward 112
7.15 Pillgwenlly Ward 117
7.16 Ringland Ward 121
7.17 Rogerstone Ward 126
7.18 Shaftesbury Ward 131
7.19 St Julians Ward 137
7.20 Stow Hill Ward 142
7.21 Tredegar Park Ward 147
7.22 Victoria Ward 152
8 Implementation and Delivery 157
8.1 Summary of Measures 157
8.2 Implementation Programme 157
8.3 Measure justification 158
8.4 Funding for Local Flood Risk Management 158
8.5 Environmental Influences on Measures 161
9 Public Consultation 164
9.1 Consultation on the Draft Local Flood Risk Management Plan 164
9.2 Further Consultation 165
10 Monitoring and review 166
Tables
Table 1 – Summary of relevant plans and lead RMAs
Table 2 – Definition of ‘non-residential’ and ‘essential service’ property type
Table 2 - Total counts of features in NCC
Table 3 - NCC Local Flood Risk Management Strategy Measures
Table 4 - Table outlining the primary roles of RMAs operating within Newport.
Table 5 – Definitions of measures, used for reporting within the Floods Directive.
Table 6 – Mapping interdependencies between Management Plan measures.
Table 7 - Objectives of the National FRM Strategy and the NCC LFRMS
Table 8 – Top five ranked wards, by proportion of properties at predicted flood risk (depth>0.2m)
Table 9 – Summary of the predicted risk from surface water to a range of receptors.
Table 10 - Estimated residents in areas at risk of flooding depth >0.0m
Table 11 - Residential Properties at risk of internal flooding depth >0.2m
Table 12 – Total features at high risk of surface water flooding (greater than a 1 in 30 chance of flooding in any year)
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Table 13 - Total features at medium risk of surface water flooding (between 1 in 30 and 1 in 100 chance of flooding in any year)
Table 14 - Total features at low risk of surface water flooding (between 1 in 100 and 1 in 1000 chance of flooding in any year)
Table 15 – Summary of Borough-wide Measures
Table 16 – Recorded historic local flooding in Allt-yr-yn
Table 17 – Flood risk map counts for Allt-yr-yn
Table 18 – Local flood risk management measures for Allt-yr-yn
Table 19 – Recorded historic local flooding in Alway
Table 20 – Flood Risk Map counts for Alway
Table 21 - Local Flood Risk Management measures for Alway
Table 22 – Recorded historic local flood events in Beechwood
Table 23 – Flood Risk Mapping counts for Beechwood
Table 24 - Local Flood Risk Management measures for Beechwood
Table 25 – Recorded historic flooding in Bettws
Table 26 – Flood Risk Map counts for Bettws
Table 27 – Local Flood Risk Management measures for Bettws.
Table 28 – Recorded historic ordinary watercourse flooding in Caerleon
Table 29 – Recorded historic surface water flooding in Caerleon
Table 30 - Flood Risk Map counts for Caerleon
Table 31 - Local Flood Risk Management measures for Caerleon
Table 32 - Flood Risk Map counts for Gaer
Table 33 – Local Flood Risk Management measures identified for Gaer
Table 34 - Flood Risk Map counts for Graig
Table 35 – Local flood risk management measures for Graig
Table 36 – Flood Risk Map counts for Langstone.
Table 37 – Local flood risk management measures for Langstone.
Table 38 – Flood Risk Map counts for Liswerry
Table 39 – Local Flood Risk Management measures for Liswerry
Table 40 – Flood Risk Map counts for Llanwern
Table 41 – Local Flood Risk Management measures for Llandwern
Table 42 – Flood Risk Map counts for Malpas
Table 43 – Local Flood Risk Management measures for Malpas
Table 44 – Flood Risk Map counts for Marshfield.
Table 45 – Local Flood Risk Management measures for Marshfield
Table 46 – Flood Risk Map counts for Pillgwenlly
Table 47 – Local Flood Risk Management measures for Pillgwenlly
Table 48 – Flood Risk Map counts for Ringland
Table 49 – Local Flood Risk Management measures for Ringland
Table 50 – Flood Risk Map counts for Rogerstone
Table 51 – Local Flood Risk Management measures for Rogerstone
Table 52 – Flood Risk Map counts for Shaftesbury
Table 53 – Local Flood Risk Management measures for Shaftesbury
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Table 54 – Flood Risk Map counts for St Julians
Table 55 – Local Flood Risk Management measures for St Julians
Table 56 – Flood Risk Map counts for Stow Hill
Table 57 – Local Flood Risk Management measures for Stow Hill
Table 58 – Flood Risk Map counts for Tredegar Park
Table 59 – Local Flood Risk Management measures for Tredegar Park
Table 60 – Flood Risk Map counts for Victoria
Table 61 – Local Flood Risk Management measures for Victoria
Table 62 – Summary of local flood risk management proposed measures across NCC
Appendices
Appendix A
Historic Local Flood Events
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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List of Acronyms
CIL Community Infrastructure Levy
DCWW Dŵr Cymru Welsh Water
Defra Department for Environment, Food and Rural Affairs
EC European Commission
ERDF European Regional Development Fund
EU European Union
FCERM Flood and Coastal Erosion Risk Management
FDGiA Flood Defence Grant in Aid
FWMA Flood and Water Management Act 2010
FTE Full Time Equivalent
GIS Geographical Information Systems
HRA Habitat Regulations Assessment
IDB Internal Drainage Board
LFRMP Local Flood Risk Management Plan
LFRMS Local Flood Risk Management Strategy
LLFA Lead Local Flood Authority
LRF Local Resilience Forum
NCC Newport City Council
NFM Natural Flood Management
PFRA Preliminary Flood Risk Assessment
RBMP River Basin Management Plan
RMA Risk Management Authorities
SEA Strategic Environmental Assessment
SFCA Strategic Flood Consequences Assessment
SMP Shoreline Management Plan
TAN Technical Advice Note
WCMC Wales Coastal Monitoring Centre
WFD Water Framework Directive
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Synopsis
Newport City Council (NCC) is a designated Lead Local Flood Authority (LLFA)
under the Flood and Water Management Act (FWMA) 2010. NCC has joined all
the LLFAs across Wales in opting to prepare a Flood Risk Management Plan
(FRMP) to ensure a consistent approach.
Surface water flooding is not a significant flooding mechanism for many parts of
Newport as fluvial and/or tidal flooding presents a more significant risk. However
it presents a residual risk and, often exacerbated by blockages, localised surface
water flooding in a few locations is relatively frequent. Notable historic surface
water flooding includes the City Centre in 1997, Gaer Vale in 2000 and across the
Borough in 2014. Surface water drainage issues can be exacerbated by high tides
in the Severn and Usk Estuary causing river or drainage systems to back up and
occasionally flood. This is a particular issue on the low-lying Caldicot and
Wentlooge levels. The wards with the highest proportion of properties at predicted
surface water flood risk are Alway, Allt-yr-Yn, Bettws, Graig and Ringland.
The Plan gives an overview of the flood risk from local sources in the borough
consisting of surface water, groundwater and ordinary watercourses. Flood risk
arising from Main Rivers, sea and reservoirs in Newport, and ordinary
watercourses in the Caldicot and Wentlooge Level drainage districts are the
responsibility of Natural Resources Wales.
This Plan describes detailed objectives and measures which will ensure local
flood risk in the borough is reduced during the next 6 years, after which the Plan
will be reviewed.
Flood risk management activities in the Borough have primarily been historically
funded through government grants. However moving forwards, a partnership
approach will be required. Implementing the measures will depend on securing
sufficient funding. Failure to receive additional funding could result in measures
identified not being implemented in part or full, or delayed.
Ove Arup & Partners Limited (Arup) have been commissioned by NCC to support
the preparation of this plan. Arup cannot accept liability for the accuracy or
otherwise of information derived from secondary sources, however, endeavours
have been made to verify the suitability and appropriateness of information
obtained in this way.
The report has been prepared to comply with the Welsh Local Government
Association’s FRMP template.
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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1 Introduction
The Flood Risk Regulations 2009 placed a duty on Lead Local Flood Authorities
(LLFAs) to produce a Flood Risk Management Plan (FRMP) for all Flood Risk
Areas1. Whilst no Flood Risk Area was identified in the borough, Newport City
Council (NCC) joins all LLFAs across Wales in opting to prepare a FRMP to
ensure a consistent approach.
This FRMP gives an overview of the flood risk in the borough. NCC’s high-level
objective is to work to reduce flood risk where significant local flood risk has
been identified. Detailed objectives and measures are described which will ensure
flood risk in the borough is reduced during the next 6 years, after which this plan
will be reviewed.
NCC staff have drawn on their experience and knowledge in the production of
this plan to ensure NCC will manage local flood risk in an efficient and cost
effective way. This is the first cycle of the Flood Risk Regulations. Lessons will
be learnt from the challenge of delivering flood risk management interventions
acceptable within Newport’s communities whilst attracting appropriate funding
from Welsh Government and other sources.
The predominant flood risk throughout much of Newport is from the Rivers Usk
and Ebbw, and tidal flooding from the Severn Estuary. Flood risk from surface
water and ordinary watercourses is localised, exacerbated by blockages and/or
high tides restricting drainage.
This plan covers flooding from surface water, groundwater, ordinary watercourses
and the interface with river flooding. Flood risk arising from Main Rivers, sea and
reservoirs in Newport is the responsibility of Natural Resources Wales (NRW)
and their proposals are contained within the Severn River Basin District FRMP.
Ordinary watercourses in the Caldicot and Wentlooge Level drainage districts are
the responsibility of NRW.
1 Map of agreed Flood Risk Areas in England and Wales. Available at:
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/307085/FRMPs_Fl
ood_Risk_Areas.pdf. Accessed 17/08/15
Newport City Council Newport Local Flood Risk Management
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2 Purpose of Flood Risk Management Plans
in managing flood risk
2.1 What is a Flood Risk Management Plan?
The natural hazard of flooding risks the safety and sustainability of communities.
Some 1 in 5 of the population is estimated to be at risk of flooding across Wales2.
Managing this risk through careful planning is important to minimise the risk to
communities. Flood risk management planning allows Risk Management
Authorities (RMAs) to develop a better understanding of risk from all sources of
flooding and agree priorities to manage that risk.
This FRMP sets out how NCC will over the next 6 years manage flooding from
local sources so that the communities most at risk and the environment benefit the
most. In doing so, this FRMP takes forward the objectives and actions set out in
NCC’s Local Flood Risk Management Strategy3 (LFRMS).
This FRMP also sets out to meet the relevant objectives in the Welsh
Government’s National Flood and Coastal Erosion Risk Management Strategy4.
This provides the national framework for flood and coastal erosion risk
management in Wales through four overarching objectives:
Reducing the consequences for individuals, communities, businesses and the
environment from flooding and coastal erosion;
Raising awareness of and engaging people in the response to flood and
coastal erosion risk;
Providing an effective and sustained response to flood and coastal erosion
events; and
Prioritising investment in the most at-risk communities.
2.2 What is included in this Plan?
The information within this FRMP includes the components set out in the EU
Flood Directive. Most information has been gathered and updated through this
first cycle, drawn from the findings of NCC’s Preliminary Flood Risk Assessment
(PFRA) and the measures NCC set out in their LFRMS.
This FRMP sets out objectives for the management of flood risk from local
sources within the borough. The objectives focus on reducing the adverse
consequences of flooding for human health, the environment, cultural heritage and
economic activity.
2 Summary national flood and coastal erosion risk management strategy: Wales. Available from:
http://gov.wales/docs/desh/publications/120412nssummaryen.pdf Accessed on 02/09/15. 3 Newport City Council Local Flood Risk Management Strategy. Available at
http://www.newport.gov.uk/documents/Policies/Newport-LFRMS-Report-Issue-Rev.pdf Accessed
on: 17/08/15 4 National Strategy for Flood and Coastal Erosion Risk Management. Available at
http://wales.gov.uk/topics/environmentcountryside/epq/flooding/nationalstrategy/strategy/?lang=e
n Accessed on: 24/07/15
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This report highlights the areas predicted to be at risk from surface water flooding,
groundwater flooding and ordinary watercourses in the borough. This report sets
out the measures NCC will take over the next 6 years to mitigate these risks
through prevention, protection, preparedness, and recovery and review to make
Newport’s communities more resilient. This includes non-structural measures to
reduce the consequence of flooding, including raising awareness and
understanding of local flooding issues.
2.2.1 Production of surface water flood hazard and flood risk
maps
In 2013 the Environment Agency, working with NRW and LLFAs, produced the
updated Flood Map for Surface Water5. The updated Flood Map for Surface
Water assesses flooding scenarios as a result of rainfall with the following chance
of occurring in any given year:
1 in 30 (3%)
1 in 100 (1%)
1 in 1000 (0.1%)
JBA Consultants were contracted to produce the maps on behalf of the EA, NRW
and LLFAs.
The results were based on the 1, 3 and 6 hour rainfall duration model results for
each return period which have then been combined on a worst-case basis to form a
‘critical storm duration’ dataset. Shallow/lowest hazard flooding, flooded areas of
less than 100m2 and dry areas surrounded by water less than 50m2 had been
removed.
The updated map provides the following data for each flooding scenario:
Flood extent and depth
Flood velocity (including flow direction at maximum velocity)
Flood hazard (as a function of depth and velocity)
Consistent with the Flood Risk Regulations, the flood risk classifications are:
High risk – greater than a 1 in 30 chance of flooding in any year
Medium risk – between 1 in 30 and 1 in 100 chance of flooding in any year
Low risk – between 1 in 100 and 1 in 1000 chance of flooding in any year
2.2.2 Limitations with surface water flood hazard and flood
risk maps
The Environment Agency’s updated Flood Map for Surface Water represents an
improvement on the previous surface water flood maps, however predictions
remain general in nature and limitations with prediction are summarised below:
5 Flood maps for surface water. Available at: https://naturalresources.wales/our-evidence-and-
reports/maps/flood-risk-map/?lang=en. Accessed 17/08/15.
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Flood Risk Management Plan
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Due to the modelling techniques used, the mapping picks out depressions in the
ground surface and simulates some flow along natural drainage channels, rivers,
low areas in floodplains, and flow paths between buildings. Although the maps
appear to show flooding from ordinary watercourses, they should not be taken as
definitive mapping of flood risk from these as the conveyance effect of ordinary
watercourses or drainage channels is not explicitly modelled. Also, structures
(such as bridges, culverts and weirs) and flood risk management infrastructure
(such as defences) are not represented6.
The predictions should be viewed at a high level and are not suitable for
assessment of the risk to individual properties. It should also be noted that the
maps present the ‘current day’ scenario with no allowance made for the effects of
climate change or urban creep.
2.3 Legislative Context
2.3.1 Flood Risk Regulations 2009
The purpose of the Flood Risk Regulations is to transpose the European
Commission (EC) Floods Directive (2007/60/EC), on the assessment and
management of local flood risk, into domestic law in England and Wales and to
implement its provisions. The Regulations set out a six year cycle with timescales
for reporting to the European Commission and the publication of 3 key outputs,
Figure 1.
Figure 1: Flood Risk regulations (2009) timescale7
The Regulations require NRW to prepare Directive deliverables associated with
flood risk arising from Main Rivers, the sea and reservoirs, and the LLFAs to do
the same for flood risk associated with local sources such as surface water,
groundwater and ordinary watercourses.
6 Flood maps for surface water: how they were produced. Available at:
https://www.gov.uk/government/publications/flood-maps-for-surface-water-how-they-were-
produced Accessed 17/08/15 7 Source: Welsh Local Government Association FRMP Template
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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2.3.2 Preliminary Flood Risk Assessment
The PFRA compiled information on significant local flood risk from past and
future floods, based on readily-available information. The scope of the PFRA was
a high-level screening exercise. Flooding from surface runoff, ground water and
ordinary watercourses, and any interaction these sources have with Main Rivers
was considered in order to identify flood risk areas as set out under the European
Flood Directives (Section 3.3).
NCC’s PFRA did not identify any areas of significant flood risk that satisfied the
significance criteria8 set by the Welsh Government. An Indicative Flood Risk
Area in Rogerstone has been removed during the PFRA process as it was deemed
as not having a significant present or future flood risk. This is a cross boundary
flood risk area shared with the neighbouring LLFA of Caerphilly County Borough
Council.
Newport’s PFRA is to be made available on NCC’s website.
2.3.3 Flood Risk Management Plans for Flood Risk Areas
LLFAs have a duty to prepare FRMPs for Flood Risk Areas identified in PFRAs.
NCC are currently in the first cycle of the Regulations and FRMPs represent the
final output of this cycle and must be published by December 2015. Whilst no
Flood Risk Area was identified in the borough, NCC joins all LLFAs across
Wales in opting to prepare a FRMP to ensure a consistent approach.
2.3.4 Flood and Water Management Act
The FWMA was introduced in April 2010 in England and Wales. It was intended
to implement Sir Michael Pitt’s recommendations following the widespread
flooding of 2007. The FWMA was also intended to clarify roles and
responsibilities between RMAs.
Under the FWMA, the Welsh Government produced a National Strategy for Flood
and Coastal Erosion Risk Management9 in January 2013.
LFRMS were created to define who the RMAs are, what their functions are, and
what their responsibilities are. LFRMS underwent public consultation. LFRMS
also must be consistent with the National Strategy for flood and Coastal Erosion
Management. NCC produced a LFRMS in October 2014.
2.3.5 Water Framework Directive
The Water Framework Directive came into force on 22 December 2000 and was
introduced by the European Commission (EC). Under the directive, member states
8 Indicative Flood Risk Areas have been identified where more than 5,000 people are at risk of
flooding 9 National Strategy for Flood and Coastal Erosion Risk Management in Wales. Available at:
http://gov.wales/topics/environmentcountryside/epq/flooding/nationalstrategy/strategy/?lang=en.
Accessed 11/08/15.
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are required to improve the management of water bodies with the aim of
achieving improved chemical and ecological status in inland and coastal waters by
2015. The requirements of this directive are implemented in the UK via the Water
Environment Regulations 2003. In addition to improving water quality, the
regulation also promotes sustainable use of water as a natural resource, and
encourages relevant authorities to conserve habitats and species that are dependant
directly on water.
The ecological and chemical status are assessed according to the following
criteria:
Biological quality (fish, benthic invertebrates, aquatic flora);
Hydromorphological quality such as river bank structure, river continuity or
substrate of the river bed;
Physical-chemical quality (temperature, oxygenation and nutrient conditions);
Chemical quality that refers to environmental quality standards for river basin
specific pollutants.
To meet the requirements of the Directive, NRW have produced a management
plan for each of the three River Basin Districts in Wales. The River Basin
Management Plan for the Severn River Basin District is applicable to the
administrative boundary of NCC. This management plan outlines the measures
that NRW are likely to implement to meet the requirements of the Directive.
Specific measures, particularly structural measures, associated with managing
local flood risk and coastal erosion will have to comply with the requirements of
the Directive. As part of the on-going liaison between NCC and Natural
Resources Wales, once specific measures are designed, these will be
communicated to NRW for advice. In this way, NCC will consider how the
strategy could assist, and benefit from, the delivery of the Water Framework
Directive targets of achieving ‘good’ status for each waterbody in terms of
quantity and ecological quality.
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2.3.6 Summary of relevant plans and lead Risk Management
Authorities
Table 1 – Summary of relevant plans and lead RMAs
Plan or Strategy Purpose or scope Drivers Lead RMA
National Strategy
for Flood and
Coastal Erosion
Risk Management
Sets out policies on flood and
coastal erosion risk
management in Wales
Statutory
requirement under
the FWMA.
Welsh
Government
FRMP Builds on the PFRA to set out
how flooding from rivers and
the sea (NRW / EA) or surface
water, ground water and
ordinary watercourses (LLFA)
will be managed over a 6-year
cycle.
Statutory
requirement and
timescales under
the Flood Risk
Regulations
LLFA (local flood
risk) and NRW
(rivers and the sea)
(or EA in
England)
LFRMS Sets out objectives and high-
level measures for the
management of surface water,
groundwater and ordinary
watercourse flood risk.
Statutory
requirement under
the FWMA.
LLFA
CFMP Sets out preferred flood risk
management policies for river
flooding.
Voluntary NRW (or EA in
England)
RBMP Sets out a framework to
delivery of WFD objectives.
Statutory
requirement under
the WFD.
NRW (or EA in
England)
Newport City Council Newport Local Flood Risk Management
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3 Study area
3.1 Administrative area
NCC is a Unitary Authority located in South East Wales and covers an area of
approximately 218km2. It is bordered by four other LLFAs (Figure 2);
Monmouthshire County Council, Torfaen County Borough Council, Caerphilly
County Borough Council and Cardiff City Council.
The study area is within the Severn River Basin District and is served by Dŵr
Cymru Welsh Water (DCWW) and NRW. NRW took over the duties of the
Caldicot and Wentlooge Level Internal Drainage Board in April 2015.
NCC has 20 wards with a total population of 146,600 (2013 census), some 4.8%
of the total population of Wales. The number of residential properties within
Newport is 63,400.
Figure 2: NCC administrative area and surrounding LLFA areas10
10 Source: URS Newport City Council – Preliminary Flood Risk Assessment: Preliminary
Assessment Report (2011).
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Newport City Council Newport Local Flood Risk Management
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3.1.1 List of features used in counts to assess flood risk
Guidance on FRMP preparation is available from the Environment Agency11,
NRW and Welsh Local Government Association. This includes details of the
features to be considered when evaluating flood risk from surface water and
ordinary watercourses. The features have been divided into three categories; Risk
to People, Risk to Economic Activity, and Risk to Natural and Historic
Environment. Table 3 lists all features and the total counts for each ward within
Newport.
Counts of features at predicted flood risk were carried out in accordance with The
updated Flood Map for Surface Water (uFMfSW) Property Points dataset
(Environment Agency, 2014).
The following datasets were used to generate the counts:
National Receptors Dataset (2012) - contains data on listed buildings,
scheduled ancient monuments, registered parks and gardens, environmental
permitting sites, trunk or primary roads, railways, SSSI’s.
uMfSSF Property Point Dataset - contains residential and non-residential
property point data within an area. In addition to the standard OS address layer
property data, the dataset provides details of the percentage of a perimeter that
is wetted in a 1 in 30, 1 in 100, and 1 in 1000 rainfall event at 6 different
depths: 0mm, 150mm, 200mm, 300mm, 600mm and 900mm.
A multiplier of 2.32 people per property has been used to estimate the number of
residents at risk. Each ward’s population has been also included in the report for
comparison, sourced from the Office for National Statistics (ONS) 2012 Mid-
Year Population Estimate.
Doorway and access threshold levels are an important factor in determining the
susceptibility of properties to flooding. In the absence of survey data, a typical
value of 200mm is often assumed. The report therefore considers residential
properties at risk of internal surface water flooding when flood waters are
predicted to exceed a depth of 0.2m.
It should be noted that feature counts are cumulative i.e. the total number of
features at medium risk include the total number of features at high risk.
‘Non-residential property’ and ‘essential services’ are defined in the table below
on the basis of Ordinance Survey property class.
11 Flood risk management plans (FRMPs): how to prepare them. Available at:
https://www.gov.uk/guidance/flood-risk-management-plans-frmps-how-to-prepare-them Accessed
20/07/15
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Table 2 – Definition of ‘non-residential’ and ‘essential service’ property type
Non-Res Ser. Non-Res Ser.
Airfield Electricity Generating
Almshouse Employment Agency
Ambulance Station Engineering Works
Arena Equestrian Training
Art Centre Estate Agency
Art Gallery Factory
Bakery Farming
Bank Filling Station
Bar Financial & Prof. Services
Betting Office Fire Station
Boat House Fitness Club
Bowling Football
Brewery Forge
British Legion Club Garage
Builders Garden Centre
Builders Merchant Gas Production & Distribution
Building Society Gas Regulating
Bus Depot Gas Storage
Bus Station General Commercial
Café Golf
Camping Government Office
Car Dealer Graving Dock
Car Hire Guest House
Car Wash Hairdresser
Caravanning Hall
Cash And Carry Health Centre
Cathedral Health Club
Cattery High School
Cemetery Higher Education
Central Gov. Office Hire Shop
Chapel HM Prison
Chemical Works Hopper
Chemist Horticultural Nursery
Children’s Nursery Hospice
Church Hospital
Clinic Hostel
Club Hotel
Club House Industry & Business Services
Community Centre Infant School
Community Hall Inn
Cooling Insurance Broker
Crematorium Iron Works
Cricket Job Centre
Crown Court Joinery
Dairy Junior School
Day Care Kennels
Dental Surgery Kingdom Hall
Department Store Launderette
Depot Laundry
Distribution Leisure Centre
Dog Pound Library
Dry Cleaners Local Government Office
Dry Dock Mill
Education Mosque
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Non-Res Ser. Non-Res Ser.
Museum Smithy
Nightclub Snooker
Nursery Social Club
Nursing Home Social Services
Office Sorting Office
Parish Hall Sports
Place Of Worship Sports Pavilion
Police Services Sports Viewing
Police Station Stables
Post Office Steel Works
Postal Distribution Storage
Pre School
Education Sunday School
Presbytery Supermarket
Primary School Surgery
Printing Works Take Away
Probation Centre Tank
Public Convenience Taxi Business
Public House Telecommunications
Public Recycling Television Studio
Pump House Tennis
Pumping Territorial Army
Putting Testing
Quay Theatre
Railway Station Timber Storage
Recording Studio Tourist Information
Recreation Ground Tower
Recycling Trade Distribution
Repair Centre Training
Research Travel Agency
Rest Home Tyre Depot
Restaurant University
Retail Park Vehicle Driver Training
Retail Warehouse Vehicle Testing
Road Haulier Ventilating
Rugby Football Veterinary Surgery
Sailing Vicarage
Sandwich Bar Water Distribution
School Water Filtration
Secondary School Water Regulating
Service Station Water Settling
Shelter Water Treatment
Ship Freight Welfare Services
Shopping Wholesale Market
Works
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Table 3 - Total counts of features in NCC
All
t-y
r-Y
n
Alw
ay
Bee
chw
oo
d
Bet
tws
Ca
erle
on
Ga
er
Gra
ig
La
ng
sto
ne
Lis
wer
ry
Lla
nw
ern
Ma
lpa
s
Ma
rsh
fiel
d
Pil
lgw
enll
y
Rin
gla
nd
Ro
ger
sto
ne
Sh
aft
esb
ury
St.
Ju
lia
ns
Sto
w H
ill
Tre
deg
ar
Pa
rk
Vic
tori
a
People and Property
Residential Properties (n) 3,907 3,337 3,401 3,359 3,555 3,959 2,485 1,759 5,099 1,254 3,422 2,555 3,148 3,809 4,339 2,461 3,790 2,412 1,934 3,138
Essential Services (n) 66 22 27 31 67 36 25 59 168 149 27 69 108 29 50 28 29 99 12 40
Economic Activity
Non-Residential Properties (n) 136 69 60 30 154 50 33 50 385 47 29 119 423 24 76 129 177 503 9 193
Primary/Trunk Roads (km) 48.5 27.2 28.1 28.3 69.3 37.5 54.3 114.5 80.8 75.4 31.5 128.2 47.4 38.9 61.5 29.7 31.7 29.9 21.5 18.6
Main Line Railways (km) 0.00 0.37 0.00 0.00 3.70 3.47 6.81 0.00 7.10 5.66 0.00 5.95 5.43 0.00 3.59 0.01 2.70 3.39 1.21 1.05
Agricultural Land - Grades 1, 2 & 3 (ha) 383 177 150 513 1394 281 1434 3035 1514 3988 206 3538 548 243 865 163 195 131 180 94
Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 0.00 0.00 2.45 0.00 62.94 0.00 0.00 15.44 128.29 37.30 3.41 117.64 72.87 0.00 0.00 10.67 28.77 7.09 0.00 9.33
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 34.95 37.30 0.00 117.63 0.25 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 34.95 37.30 0.00 117.63 0.25 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (ha) 0.00 0.00 2.45 0.00 63.93 0.00 3.76 72.09 706.70 2541.10 3.41 1882.25 84.12 0.00 0.00 10.80 28.83 7.07 24.34 9.33
Sites of Interest for Nature Conservation (ha) 47.86 20.25 1.77 79.48 166.02 43.25 149.44 641.88 328.58 339.24 12.37 25.38 8.26 13.15 130.23 13.43 38.22 0.00 2.48 0.00
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 23.98 220.04 221.27 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 19.98 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 8.04 3.36 0.00 37.14 47.99 0.00 212.00 502.93 0.00 94.46 3.22 7.13 0.00 10.49 136.23 3.60 0.00 0.00 0.00 0.00
Registered Parks and Gardens (ha) 23.70 0.00 11.96 0.00 0.00 72.39 7.93 3.52 0.00 89.12 0.07 50.03 0.00 0.00 0.00 7.43 0.00 9.86 0.01 0.00
Country Parks (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 34.04 0.00 0.00 0.00 0.00 0.00 0.00 0.90 0.00
Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 70.68 9.50 2.32 17.49 0.00 8.80 0.00 2.70 0.00 0.00 3.79 0.00 0.00 0.10 0.00 0.00
Listed Buildings (n) 37 2 4 7 82 4 38 32 8 16 8 27 17 0 13 6 2 107 0 19
Essential Settings of Regional Planning
Guidance (ha) 0.00 0.00 0.00 0.00 50.85 0.25 36.56 42.65 0.00 45.93 0.00 54.31 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 6.41 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
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3.1.2 River catchments
Surface water drains into the two Main River catchments, namely:
The River Usk – at over 120km long, this river is one of the longest in Wales.
It rises in the mountains of mid-Wales then flows south-east through
Abergavenny and Usk to the village of Caerleon, down through the centre of
Newport to the strong tidal waters of the Severn Estuary12. Its catchment
predominantly drains land to the north of Newport, flowing past Caerleon and
through the centre of Newport and into the Severn estuary at Uskmouth.
The River Ebbw – this catchment drains land to the west of Newport and
flows through the western extent of Newport, meeting the River Usk adjacent
to the docklands13.
NCC is bordered by the Severn Estuary to the south, which itself forms part of the
Bristol Channel and is a tidally influenced system.
3.1.3 Internal Drainage Board
The Caldicot and Wentlooge Levels also account for much of the land to the
southeast and southwest of Newport either side of the River Usk estuary.
Figure 3 – Wentlooge (green) and Caldicot (blue) Level Drainage Districts
12 Newport City Council (November 2008) Draft River Usk Strategy. Available at:
http://www.newport.gov.uk/stellent/groups/public/documents/plans_and_strategies/cont322714.pd
f Accessed on: 12/08/15 13 Newport City Council (June 2013) Newport Local Development Plan 2011-2026: Development
and Flood Risk Background Paper. Available at:
http://www.newport.gov.uk/stellent/groups/public/documents/plans_and_strategies/cont712253.pd
f Accessed on: 12/08/15
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Water levels in the low-lying drainage district are managed by an Internal
Drainage Board (IDB). They are the land drainage authority within their districts,
responsible for ordinary watercourses and functions include supervising land
drainage and flood defence works on ordinary watercourses. By doing this, they
closely manage water levels, both in watercourses and groundwater, by improving
and maintaining ordinary watercourses, drainage channels and pumping stations
to reduce the risk of flooding.
NRW took over the duties of the IDB in April 2015.
3.1.4 Artificial watercourses and waterbodies
There is one known artificial watercourse within NCC, the Monmouthshire and
Brecon Canal. The Council owns and maintains the two branches within the
borough, covering approximately 7 miles in total. The Crumlin arm runs from the
NCC boundary at Pontymason Lane through to High Cross and into the Malpas
area where it meets the Brecon arm. The Brecon arm flows through Malpas to the
city boundary with Torfaen. Lock regeneration works are ongoing, with NCC
partnering with the Monmouthshire, Brecon & Abergavenny Canals Trust to
promote sustainable regeneration of the canal from Five Locks, Pontnewydd to
Newport and from Newport up to Cwmcarn.
There are four significant artificial waterbodies (reservoirs) in the borough, in
addition to DCWW treated water storage reservoirs. NCC is responsible for
Gwastad Mawr Flood Storage Reservoir. DCWW is responsible for Pant-yl-oes
Reservoir on the northwest border and Ynysyfro Reservoir near Rogerstone. The
Leisure Trust are responsible for Tredegar Park Lake Reservoir.
3.2 Local flood risk in Newport
Local flood risk is defined within the FWMA as being a flood risk from:
Ordinary watercourses – all watercourses that are not designated Main River.
Surface runoff – rainfall or other precipitation which is on the surface of the
ground that has not entered a watercourse drainage system or public sewer.
Groundwater – water that has percolated into the ground and may form
underground ponds or streams, which may discharge above ground but lower
down the catchment.
The interface between Main Rivers and surface water flows.
The predominant flood risks throughout Newport are from fluvial and tidal
sources. Flooding from surface water, groundwater and ordinary watercourses is
not considered significant. More detail is given in the following sub-sections.
3.2.1 Catchment characteristics
The topography of Newport is generally low lying. Areas in the south and east of
the study area (including the Caldicot and Wentlooge Levels) tend to be flat,
along with areas along the banks of the River Usk (such as Caerleon). However,
areas around Wentwood and Llanvaches have steeper slopes.
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The geology of Newport is relatively uniform with the bedrock of the area
dominated by mudstone, siltstone and sandstones. This geology is permeable,
meaning that water can permeate the surface and enter watercourses via
underground (through flow), rather than overland methods.
The soils in the north-west of Newport are typified by loamy, clayey soils with
slightly impeded drainage. In the north-eastern extent of Newport, free draining,
slightly acid loamy soils are found. Soils in the Caldicot and Wentlooge Levels
and along the River Usk floodplain are typically loamy, clayey soils with
naturally high groundwater, associated with alluvial deposits14.
3.2.2 Groundwater
On a strategic scale in Newport, the PFRA concluded that groundwater is not
considered to be a significant flood risk.
The solid geology is blanketed by drift deposits across a significant proportion of
the study area, primarily comprising alluvial and glacial deposits. Tidal flat
despoits (a type of alluvium) are present across the southern parts of the study
area and around the River Usk, and are typically underlain by fluvio-glacial l
deposits. Glacial deposits dominate the north western parts of the study area, with
areas of alluvium present associated with watercourses. Generally for the north
east of the study area there are no superficial deposits indicated to be present, with
only areas of alluvium present associated with the watercourses.
The solid geology of the study area is relatively uniform. The Mercia Mudstone
Group is present in across the southern parts of the study area, comprising red
mudstone with bands of siltstones and sandstone. The St Maughnans Formation is
present across the northern parts of the study area, comprising interbedded
mudstone and sandstone. A small area of Blue Lias Limestone is also present in
the east of the study area.
Risk of groundwater flood associated with mining is low. Newport lies to the
south of the South Wales Coalfields and is therefore not effected by historic coal
mining. This has been confirmed by the Coal Authority online viewer15 which
indicates there are no mine entries, coal outcrops or recorded shallow mine
workings in the study area. The Review of Mining Instability in Great Britain16
indicates there are no records of metalliferous, rock, coal, iron, evaporites or chalk
mining in the study area. Groundwater flooding as a result of the escape of water
from mined voids is not anticipated in the study area
Tidal flat deposits are present across the south of the study area which are
relatively impermeable as they are cohesive in nature. The underlying fluvio-
14 Newport City Council (June 2013) Newport Local Development Plan 2011-2026: Development
and Flood Risk Background Paper. Available at:
http://www.newport.gov.uk/stellent/groups/public/documents/plans_and_strategies/cont712253.pd
f Accessed on: 12/08/15 15 The Coal Authority, Online interactive map viewer, database updated 14th August 2014,
accessed September 2015 http://mapapps2.bgs.ac.uk/coalauthority/home.html 16 Arup (1990) Review of Mining Instability in Great Britain for the Depart of the Environment,
Wales Region, July.
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glacial deposits are a more permeable granular material and are in hydraulic
conductively with the tidal water level. As these tidal flat deposits confines the
groundwater within the gravels, it is considered unlikely that water within the
fluvio-glacial gravels will outcrop at the group surface in the south of NCC.
3.2.3 Surface water runoff
Flooding from surface water runoff is usually caused by heavy rainfall either
when a catchment is saturated after a period of persistent rainfall or impermeable
after a prolonged dry period. Notable historic surface water flooding includes the
City Centre in 1997, Gaer Vale in 2000 and across the Borough in 2014.
Surface water flooding is often exacerbated by lack of cut-off ditches and drains,
ditches being filled in or piped, or poor maintenance of ditches and watercourses
by riparian owners. Damage to stream and other drains may also be caused by
developers or livestock. Land management practices such as removal of top soil
and removal of vegetation may also increase the surface runoff from the
catchment.
Runoff will be altered if an area is subject to a new development such as housing.
Although the total runoff is likely to increase, planning policy requires controls to
be imposed to restrict the maximum rate of runoff from these developments to
typically a level no greater than greenfield runoff or existing discharge rates
where appropriate.
3.2.4 Highway drainage
Flooding from highway drainage usually occurs due to short, very high intensity
storms. Flooding is often caused or exacerbated by highway gullies becoming
blocked by debris. NCC manage this risk by maintaining gullies (Section 4.1.1)
Pollution from highway drainage can arise from a variety of sources: these include
accidents, general vehicle and road degradation, incomplete fuel combustion,
small oil or fuel leaks and atmospheric deposition. Acute pollution occurs as a
result of severe, usually transient, impact. A prolonged dry weather period enables
a cumulative build-up of contamination on the carriageway. Intense rainfall
following these conditions can lead to the highest concentrations of pollutants.
3.2.5 Ordinary watercourses
At a community-scale, the area is drained through numerous ordinary
watercourses. An ordinary watercourse is defined as a watercourse that does not
form part of a Main River. This includes streams, drains, culverts, dikes, ditches
and passages through which water flows. Known features are recorded by NCC
and others are likely to be found as investigations continue.
Flooding may be caused by inadequate maintenance, which is normally the
responsibility of the riparian owners. Capacities of pipes are often significantly
reduced by the build-up of silt and debris within the culverts. Flooding may also
occur as a result of culvert failure. There are 345 culverts for which NCC are
responsible for the maintenance of and a further 304 highway culverts. NCC
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inspect culverts where there is evidence that capacity has been adversely affected
(see Section 4.1.1).
The surface water from the watercourses enters the drainage system through a
large number of intakes, some with debris screen grids and some without.
Flooding may occur when a culvert inlet or grid becomes blocked. NCC manage
this risk by cleaning and maintaining inlets (see Section 4.1.1)
There are approximately 87 debris gratings which NCC are responsible for. Ten
inlets have been identified as critical due to the high risk of property or high speed
road flooding should they become blocked:
Ringland Circle, Ringland
Llanwern Village
Tredegar Reen, Duffryn
Ogmore Crescent, Bettws
Nant Coch, Western Avenue
Forge Lane, Rogerstone
Gaer Pond
St Cadocs Close, Caerleon
A48 Langstone
A48 Penhow
There are 18 storm water pumping stations maintained by NCC. Typically they
are served by a dual pump arrangement providing some back-up. All are
understood to be powered by mains electricity with no on-site back-up generation.
Old Green South and Old Green North become tide-locked, restricting discharges.
The following are considered high-risk and have telemetry installed:
Malpas, M4 Roundabout
Docks Way, Maesglas
Old Green South
Illegal connections to existing culverts and the culverting of watercourses without
consent, also present a potential source of flooding and pollution. Where illegal
works are identified, NCC can utilise its powers as LLFA to remedy the situation.
3.2.6 Sewer flood risk
The sewer network in Newport mostly comprises combined sewers that take both
foul sewage and surface water. Flows are usually controlled through combined
sewer overflows (CSOs), which allow excess dilute flows to discharge into natural
drainage channels to protect properties from sewer flooding but adversely
affecting the quality of receiving watercourses. NRW is responsible for licencing
and monitoring all CSOs.
DCWW is the statutory water undertaker and is responsible for the public sewer
systems within the Borough. DCWW maintains a register of historical property
sewer flooding events which shows that there are localised sewer flooding issues
within the borough. NCC operate and maintain 11 wastewater pumping stations
which are to be transferred to DCWW ownership in 2016.
Sewer flooding occurs when sewers are overwhelmed by heavy rainfall or when
they become blocked. The chance of flooding depends on the capacity of the local
sewerage system. Anonymised records of sewer flooding incidents from DCWW
within Newport (dated 28th May 2015) indicate properties have flooded internally
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and externally in the past due to hydraulic overload. Some external locations may
be areas such as sections of highway, fields, car parks etc.
In addition, data provided by the Integrated Surface Water Management Group
indicates several small sewer flooding hotspots. However, the PFRA concluded
flooding from sewers does not have significant consequences at a strategic scale.
3.2.7 Flood risk from Artificial Sources
There are four significant artificial waterbodies (reservoirs) within their authority
boundary, however, there are no records of flooding from these waterbodies. NCC
own and maintain the two branches of the Monmouthshire and Brecon Canal.
There are no records of flooding from the canal within the borough.
3.2.8 Interaction with Main Rivers and the Sea
There are significant areas within Newport which are subject to river flooding.
River flooding remains within the remit of NRW and is covered in the Severn
River Basin Flood Risk Management Plan. Figures for river flooding have not
been included in this report as it could result in double counting.
The PFRA concluded that there was insufficient data available to draw definitive
conclusions. Anecdotal evidence suggests that surface water flooding is
exacerbated when high rainfall events occur during high tidal cycles as gravity
drains and the outfalls are restricted by high tidal waters. Typically, these issues
occur on and around the Caldicot Levels where the consequences are not deemed
significant. Interactions with Main Rivers may also be identified within central
Newport where surface water systems discharge into the River Usk in areas such
as Crindau, the City Centre, Victoria and Reevesland. The formal and anecdotal
data provided indicates that such interaction does not cause flooding with
significant harmful consequences. In some locations drainage infrastructure, such
as surface water pumping stations, mitigates this risk.
3.3 Approach to high-level costing of measures
High-level costing of measures has been completed using the Environment
Agency’s long term costing tool for flood and coastal risk management17 where
sufficient information is available, or an indicative cost range has been estimated
on the basis of similar types of schemes. No site walkovers, investigation or
design has been completed as part of this desk-based study. Information including
site-specific investigation, design and procurement-forms will be required to
develop the costing of measures prior to business case justification and
subsequent delivery.
17 Long term costing tool for flood and coastal risk management. Available at:
https://www.gov.uk/government/publications/long-term-costing-tool-for-flood-and-coastal-risk-
management Accessed on 26/8/15
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4 How Newport City Council currently
manages flood risk
NCC manage flood risk arising from surface water, groundwater and ordinary
watercourses through:
1. Operational procedures, developed over years through good practice;
2. Measures included in the LFRMS;
3. Powers given to all LLFA through the FWMA 2010 and the Land Drainage
Acts 1991 and 1994;
4. As NCC is also the Highways Authority for the area, powers under the
Highway Act 1980.
5. As NCC is also the Local Planning Authority, powers under the Planning
(Wales) Act 2015.
4.1.1 Operational procedures
The main operational procedures used to manage flood risk in NCC are listed
below:
1. Routine inspection and cleansing of highway drains (also called ‘surface
water gullies’). All gullies are cleansed once a year on a routine programme.
Any defects identified such as broken covers or stubborn blockages are
identified and works orders raised to repair.
2. Reactive inspection and cleansing of blocked gullies which have been
notified to NCC Highways by the public. If deemed necessary they are
cleaned on a weekly reactive cleansing schedule.
3. Reactive inspection and repair of culverts. Given the level of resource to
effectively inspect all culverts; inspections are restricted to systems where
there is evidence that the capacity has been adversely affected.
4. Routine inspection, cleansing and maintenance of all intake grids to culverts
on a continuous rota throughout the year. There is no telemetry on grids.
5. Reactive inspection and clearance of ‘critical’ grids preceding and following
forecast heavy rainfall and/or a Flood Watch has been issued by NRW.
6. Emergency cleansing of blocked grids which have been notified to NCC
Drainage by members of the public.
7. Reactive maintenance of NCC surface water outfalls.
8. Routine maintenance of NCC surface water pumping stations and on a
reactive basis when a problem becomes apparent.
9. Liaison with the riparian owner to ensure they are fulfilling their
responsibilities.
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10. Supporting the LPA determination of applications for development to
ensure that surface water run-off is to be controlled as near to the source as
possible by the use of sustainable drainage systems18.
4.1.2 Measures contained within the Local Flood Risk
Management Strategy
Measures by NCC to manage and reduce flood risk contained within the LFRMS
are summarised in Table 4.
18 Planning Policy Wales – Development Management and Flood Risk. Available at:
http://gov.wales/docs/desh/publications/140731planning-policy-wales-edition-7-en.pdf Accessed
17/08/15.
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Table 4 - NCC Local Flood Risk Management Strategy Measures
Short Term (0-20 years) and Short, medium and long term (0-100 years)
National Objectives NCC LFRMS’s Measures
Reducing the consequences for individuals, communities,
businesses and the environment from flooding and coastal erosion
In partnership with other RMAs will lead the management of local flood risk and coastal erosion risk.
Identify areas of significant local flood risk and prepare FRMP, using Flood Hazard maps and historical flood data. Identify areas at high risk of coastal erosion using Welsh Government maps, and
prepare appropriate management plans.
Ensure that the Local Development Plan adequately addresses flood and coastal erosion risks including climate change. Prepare the Strategic Flood Consequence Assessment to form part of LDP
evidence base to help NCC make informed decisions so that, wherever possible, new development is directed away from areas at high risk of flooding, unless the Development Advice Maps are
demonstrated to be incorrect and there are acceptable mitigation measures.
Where required and funding is available, undertake catchment-based studies with a view to identifying flood risk and design new mitigation measures.
Provide, whenever possible and in conjunction with the RMAs, advice to supportive landowners on sustainable land management.
Establish, and regularly update, a register of all flood risk assets that are likely to significantly influence local flood risk and coastal erosion.
Use forthcoming Welsh Government National Standards for Sustainable Drainage (SuDS) and accompanying guidance, when/if Schedule 3 of the FWMA places a duty on NCC to undertake the
role of SuDS Approval Body (SAB).
Annually monitor the strategy and review the strategy every 6 years.
Raising awareness of and engaging people in the response to flood
and coastal erosion risk
In conjunction with the RMAs:
Liaise with local communities and businesses to raise awareness on flood and coastal erosion risks.
Raise awareness of property level protection19.
Encourage participation from willing local communities and businesses in managing local flood risk.
Make appropriate provisions to enable local communities and businesses to find information associated with flood and coastal erosion risks. This will include guidance on how to report a flood
incident, important contact details and guidance on preparing flood plans.
Form partnerships with relevant stakeholders to manage local flood risk.
Providing an effective and sustained response to flood and coastal
erosion events
In conjunction with the Gwent Local Resilience Forum (LRF) and the RMAs as appropriate:
Prepare emergency response plans to deal with flood risk arising from local sources.
Assist local communities, businesses and individuals with the preparation of emergency plans.
Continue to undertake exercises to test the implementation of their emergency plans, and their response and recovery mechanism to flooding incidents.
Where necessary, endeavour to undertake investigations into flood incidents within four weeks.
Prioritising investment in the most at risk communities Identify communities most risk of flooding from local sources or from coastal erosion, consider the cost and benefits to manage or reduce the risk, and prepare and implement prioritised projects.
Annually review current maintenance regime and consider targeted maintenance changes to manage or reduce local flood and coastal erosion risk.
19 What is Property Level Protection? Available from http://www.nationalfloodforum.org.uk/what-is-plp/ Accessed 17/08/15.
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4.1.3 Additional duties under the Flood and Water
Management Act 2010
Under the FWMA, LLFAs such as NCC have been given additional duties which
directly impact on flood risk management. These include:
1. A duty to investigate all flooding within its area, in so far as a LLFA
consider it necessary or appropriate;
2. A duty to maintain an asset register of structures and features likely to affect
flood risk;
3. A duty to contribute to sustainable developments; and
4. Consenting on Ordinary Watercourses (Section 29 of Schedule 2).
4.2 How Newport City Council prioritises their work
The National Strategy sets a range of factors which should be considered in
determining the type of risk management intervention, scale of investment and
share met by Government. This largely considers the impact on receptors at-risk,
influenced by the scale, duration, and onset of flooding:
Risk to life;
Longer term sustainability of the community, the approach taken and the
wider environment;
Economic impacts, costs and benefits;
Impacts of flooding on the operational capacity of critical infrastructure;
Social impacts, costs and benefits;
Frequency of flooding;
Environmental costs and benefits derived from the work;
Availability of appropriate compensation sites where work impacts designated
habitats;
Impacts on wider cultural heritage; and
Multiple benefits in relation to human health and wellbeing.
Risk to life is regarded as the most significant factor in determining priority of
investment. Welsh Government recently consulted on the way it allocates
funding20. They intend to create a clear, objective way of directing funds to places
at risk from all sources of flooding and coastal erosion.
In order to satisfy the requirements of the National Flood and Coastal Erosion
Risk Management Strategy, NCC’s FLRMS has thirteen detailed objectives
implemented by twenty-one prioritised measures.
Frequency of flooding is considered in terms of the annual probability of flooding.
This is a measure of the chance of flooding over the course of any given year.
20 Flood and Coast Investment Programme (FaCIP) Consultation. Available at:
http://gov.wales/consultations/environmentandcountryside/flood-and-coast-investment-
programme-facip/?lang=en Accessed 11/08/15.
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4.3 Who Newport City Council works with to
manage flood risk
4.3.1 Risk management authorities
NCC works closely with other RMAs to endeavour to bring to the community a
joined-up approach to all sources of flooding, no matter which organisation has
the legal duty. An example of such partnership working is the joint partnership
between the then Environment Agency (now NRW) and NCC response to Malpas
Brook flooding 130 properties and the Usk flooding an additional 9 properties in
2000, and the subsequent Goodrich Crescent scheme delivery.
A list of the primary organisations NCC works with to manage flood risk is
provided in Table 5. All these organisations will be consulted as part of
preparation of this FRMP. The roles and responsibilities of RMAs are provided in
detail by the Welsh Government’s National Strategy for Flood and Coastal
Erosion Risk Management.
Table 5 - Table outlining the primary roles of RMAs operating within Newport.
Organisation Area covered Summary of primary roles in respect of local
sources of flood risk
Primary Risk Management Authorities
Natural Resources
Wales
Including the former:
Environment
Agency
Forestry
Commission
Wales
Countryside
Council for
Wales
Caldicot and
Wentlooge
Levels Internal
Drainage Board
Wales Oversight responsibilities in relation to all flood
and coastal erosion risk management in Wales,
including flood risk arising from local sources.
NRW leads on the provision of technical advice and
support to the other RMAs. They also lead on
national initiatives such as Flood Awareness Wales
and is the single point of contact for enquiries and
information on flood risk.
In relation to responsibility for land drainage in the
Gwent levels, an area of special drainage need:
A duty to comply with the National Strategy
and the relevant Local Strategy;
Co-operation with other authorities, including
sharing data; and
A duty to contribute to sustainable
development.
Dŵr Cymru Welsh
Water
Supplies
drinking water
and sewerage to
most of Wales
and parts of
western England
To act consistently with the National Strategy;
To have regard to the content of the relevant
Local Strategy; and
To co-operate with other RMAs including
sharing data.
Newport City Council Newport NCC has been established as a LLFA for its
administrative area. NCC is also the highway
authority for the area having responsibility for
managing all adopted highways which are not
included within the remit of SWTRA. NCC also is
the local planning authority and the Civil
Contingencies Unit.
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Other key partners include:
Neighbouring LLFAs – Caerphilly County Borough, Cardiff City,
Monmouthshire County and Torfaen County Borough Councils.
The borough’s 12 community councils21
Flood Risk Management Wales Committee22
Emergency Services – South Wales Fire and Rescue, Welsh Ambulance
Service, Aneurin Bevan University Health Board and Gwent Police
National Flood Forum
Network Rail
Local Resilience Forum (LRF)
South Wales Trunk Road Agency (SWTRA)
Cadw
4.3.2 Riparian landowners
Those who own land adjoining, above or with a watercourse running through it,
are ‘riparian landowners’ and are key to efforts to manage flood risk from
ordinary watercourses. NRW provide useful guidance on riparian landowner
responsibilities23 which include:
maintaining river beds and banks
allowing the flow of water to pass without obstruction
controlling invasive species such as Japanese knotweed
Riparian landowner also have a responsibility to manage their own flood risk.
4.4 How this FRMP has been coordinated
Co-ordination and development of this FRMP has been achieved through regular
meetings of the various groups as listed below:
1. South and East Wales Flood Risk Management Group attended by all LLFA
in South Wales, NRW, Welsh Local Government Association and DCWW;
2. FRMP Working Group attended by all LLFAs in South East Wales, Welsh
Government, NRW and Welsh Local Government Association;
3. Internal collaboration has been achieved through regular meetings of the
Flood Risk Management Team; and
4. Sharing of work programmes with NRW and DCWW.
21 Newport Community Councils. Available at:
http://www.newport.gov.uk/_dc/index.cfm?fuseaction=political.communitycouncils. Accessed on
11/08/15. 22 Flood Risk Management Wales Committee. Available at: http://naturalresources.wales/about-
us/our-chair-and-board/our-board-committees/flood-risk-management-wales-committee-
frmw/?lang=en. Accessed 11/08/15. 23 A guide to your rights and responsibilities of riverside ownership in Wales. Available at:
https://naturalresources.wales/flooding/managing-flood-risk/riverside-property-owners-know-
your-rights-and-responsibilities/?lang=en Accessed on 05/10/15.
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4.5 Measures already underway to manage flood risk
Details of the measures and operational procedures already underway in Newport
have been listed in Section 4.1.1. The Floods Directive places a requirement that
the measures should address the four categories of Prevention, Protection,
Preparedness, and Recovery and Review. Details for each category are below. A
count of the number of measures within each category has been included by ward.
Table 6 – Definitions of measures, used for reporting within the Floods Directive.
Reporting
Code
Prevention
Type Measure Description
M21 Avoidance Measure to prevent the location of new or additional receptors in
flood prone areas, such as land use planning policies or
regulation.
M22 Removal or
Relocation
Measure to remove receptors from flood prone areas, or to
relocate receptors to areas of lower risk.
M23 Reduction Measures to adapt receptors to reduce the adverse consequences
in the event of a flood action on buildings, public networks, etc.
M24
Other
Prevention
Other measures to enhance flood risk prevention (may include,
flood risk modelling and assessment, flood vulnerability
assessment, maintenance programmes, or policies etc.)
Issue Flood Defence Consents, comment on Flood Consequence
Assessments, update and improve the accuracy of flood risk
mapping, and understand the local flood risk better.
Reporting
Code
Protection
Type Measure Description
M31 Natural Flood
Management/
Run Off and
Catchment
Management
Measures to reduce the flow into natural or artificial drainage
systems, such as overland flow interceptors and or storage,
enhancement of infiltration etc. and including in-channel,
floodplain works and the reforestation of banks, that restore
natural systems to help slow flow and store water.
M32 Water Flow
Regulations
Measures involving physical intervention to regulate flows,
such as construction modification or removal of water retaining
structures (e.g. dams or other on-line storage areas or
development of existing flow regulation rules), and which have
significant impact on the hydrological regime.
M33 Channel,
Coastal and
Floodplain
Works
Measures involving physical interventions to freshwater
channels, mountain streams estuaries coastal waters and flood
prone areas of land, such as construction, modification or
removal of structures or the alteration of channels, sediment
dynamics management, dykes etc.
M34 Surface Water
Management
Measures involving physical interventions to reduce surface
water flooding, typically, but not exclusively, in an urban
environment, such as enhancing artificial drainage capacity or
through sustainable drainage systems (SuDS).
M35
Other
Protection
Other measures to enhance protection against flooding,
including flood asset maintenance programmes, or policies.
On-going maintenance programme.
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Reporting
Code
Preparedness
Type Measure Description
M41 Flood
Forecasting
and Warning
Measures to establish or enhance a flood forecasting or warning
system.
M42 Emergency
Event
Measures to establish or enhance flood event institutional
emergency response planning.
M43 Public
Awareness
and
Preparedness
Measures to establish the public awareness or preparedness for
flood events.
Flood awareness programme.
M44 Other
Preparedness
Other measures to establish or enhance preparedness for flood
events to reduce adverse consequences.
Report
Code
Recovery and Review
Type Measure Description
M51 Individual and
Societal
Recovery
Clean up and restoration activities (buildings, infrastructure, etc.).
Health and mental health supporting actions, including managing
stress. Disaster financial assistance (grants, tax) including disaster
unemployment assistance, temporary or permanent relocation or
other.
M52 Environmental
Recovery
Clean up and restoration activities (with several sub topics as
mould protection, well-water safety and securing hazardous
material containers).
M53 Other Recovery
and Review
Lessons learnt from flood events, insurance policies.
Each measure listed in the Flood Risk Management Strategy and used in this
report has been placed into one of these categories as noted within each measure.
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5 Coordination with the Severn River Basin
Management Plans
NCC lies within the catchment for the River Severn RBMP. The updated draft
Severn RBMP was published24 by the Environment Agency and NRW. NCC
reviewed the consultation draft and no matters were raised in response.
Flood risk management is one of many reasons why waterbodies fail to meet the
WFD objectives. Where action is needed to manage the risk of flooding, it should
not lead to further deterioration of the water environment but instead seeks
opportunities for improvement and delivers joint benefits.
The draft Severn River Basin Flood Risk Management Plan (RBFRMP) was
published25 by the Environment Agency and NRW.
Figure 4 - 2009 River Basin Management Plan ecological river waterbody quality status26
- note estuarine River Usk is moderate.
24 River basin management plan for the Severn River basin district. Available at:
https://consult.environment-
agency.gov.uk/portal/ho/wfd/draft_plans/consult?pointId=s1405417965041#section-
s1405417965041. Accessed 17/08/15 25 Draft Severn River Basin District Consultation on the draft Flood Risk Management Plan.
Available at: http://naturalresources.wales/about-us/consultations/our-own-consultations-
closed/consultation-on-draft-flood-risk-management-plans-for-wales/?lang=en. Accessed
17/08/15. 26 Available at: http://maps.environment-
agency.gov.uk/wiyby/wiybyController?topic=wfd_rivers&layerGroups=default&lang=_e&ep=ma
p&scale=6&x=331382&y=188071 Accessed 05/10/15.
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Figure 5 - 2009 River Basin Management Plan ecological river waterbody quality
status27- note estuarine River Usk is good.
In selecting the measures in the FRMP we have considered what is proposed in
the other plans to ensure that all are complimentary. This is shown in Table 7.
Where there is an obvious opportunity to deliver against the Water Framework
Directive and the Flood Regulations, we have endeavoured to include it.
27 Available at: http://maps.environment-
agency.gov.uk/wiyby/wiybyController?topic=wfd_rivers&layerGroups=default&lang=_e&ep=ma
p&scale=6&x=331382&y=188071 Accessed 05/10/15.
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Table 7 – Mapping interdependencies between Management Plan measures.
Measure Category NCC LFRMS Measure Severn FRMP Measure Severn RBMP Measure
Prevention NCC in partnership with other RMAs will lead the management of flood risk arising from local
sources, and coastal erosion risk within Newport
Working with others to avoid inappropriate development to the floodplain
Ensuring appropriate floodplain compensation to mitigate for development
Supporting the implementation of sustainable urban drainage systems
Advising how new development can be more resilient to flooding
Ensuring a robust maintenance programme
Table 9, Measure 2: Removal or modification of engineering
structure
Table 9, Measure 3: Improvement to condition of channel/bed
and/or banks/shoreline
Table 9, Measure 5: Changes to operation and maintenance
Table 9, Measure 6: Vegetation management
Table 9, Measure 7: Dredging and silt management
Table 12, Measure 3: Improvement to condition of
channel/bed and/or banks/shoreline
Prevention NCC will use EA flood hazard maps to identify areas of significant local flood risk,
supplemented with historical data. Flood Risk Management Strategy and plans will be
prepared on this information.
Undertaking mapping and modelling to ensure flood risk information remains up to
date and fit for purpose
Table 9, Measure 5: Changes to operation and maintenance
Prevention NCC will undertake catchment based studies with a view to identifying flood risk and design
new mitigation measures.
Identifying opportunities for floodplain restoration
Ensuring appropriate flood plain compensation to mitigate for development
Table 9, Measure 2: Removal or modification of engineering
structure
Table 9, Measure 5: Changes to operation and maintenance
Protection NCC, with the RMAs, will provide advice to supportive landowners on sustainable land use
management aiming at improving the risk of flooding.
Increasing awareness and encouraging landowners to fulfil their riparian landowner
responsibilities
Encouraging best farming practices to reduce rapid surface water run-off and soil
erosion
Table 9, Measure 6: Vegetation management
Table 14, Measure 3: Sustainable woodland and forestry
management
Preparedness NCC will establish, and regularly update, a register of all flood risk assets that are likely to
influence local flood risk and coastal erosion.
Reviewing Asset System Management Plans
Delivering emergency works where needed for flood risk management assets.
Table 9, Measure 5: Changes to operation and maintenance
Protection NCC will adopt the Welsh Government guidance to implementing Sustainable Drainage
Systems and to execute its role as a SuDS Approval Body, subject to the implementation of
this legislation.
Supporting the implementation of sustainable urban drainage systems Table 9, Measure 4: Improvement to condition of riparian
zone and/or wetland habitats
Table 9, Measure 6: Vegetation management
Table 14, Measure 3: Sustainable woodland and forestry
management
Recovery and
Review
NCC will annually monitor the strategy and will review the strategy every 6 years. Improve and develop service based on lessons identified following flood events.
Preparedness NCC, with the RMAs, will liaise with local communities and businesses to raise awareness on
flood and coastal erosion risks.
Working with others to avoid inappropriate development in the floodplain.
Promoting flood resilience and flood proofing
Providing advice and information to local communities to enable them to reduce the
impact of flooding
Preparedness NCC, with the RMAs, will raise awareness on the implementation of property level flood
resilience measures.
Advising how new development can be more resilient to flooding
Providing advice and information to local communities to enable them to reduce the
impact of flooding
Preparedness NCC, with the RMAs, will make appropriate provisions to enable local communities and
businesses to find information associated with flood and coastal erosion risks. This will include
guidance on how to report a flood incident, contact details, and guidance on preparing flood
plans.
Providing advice and information to local communities to enable them to reduce the
impact of flooding
Maintaining and improving the flood forecasting, flood warning and flood incident
management service
Providing flood incident response service 24 hours a day
Preparedness NCC, in conjunction with the Gwent LRF, is preparing emergency response plans to deal with
flood risk arising from local sources.
Maintaining and improving the flood forecasting, flood warning and flood incident
management service
Table 9, Measure 10: First cycle investigations
Preparedness NCC, in conjunction with the LRF, and the RMAs, will assist local communities, businesses
and individuals with the preparation of emergency plans.
Maintaining and improving the flood forecasting, flood warning and flood incident
management service
Table 9, Measure 10: First cycle investigations
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Measure Category NCC LFRMS Measure Severn FRMP Measure Severn RBMP Measure
Recovery and
Review
Where necessary, NCC will endeavour to undertake investigations into flood incidents within
four weeks.
Ensuring a robust maintenance programme
Maintaining and improving the flood forecasting, flood warning and flood incident
management service
Providing flood incident response service 24 hours a day
Improve and develop services based on lessons identified following flood events
Table 9, Measure 10: First cycle investigations
Protection NCC will identify communities that are most at risk of flooding from local sources or from
coastal erosion, consider the cost and benefits of identified schemes that manage or reduce the
risk of flooding from these sources, and prepare and implement a prioritisation system specific
projects. NCC will also prepare a business case for securing funding for these projects.
Undertake initial assessment and feasibility work for reducing flood risk Table 9, Measure 10: First cycle investigations
Protection NCC will annually review their current maintenance regime and consider targeted maintenance
changes to manage or reduce local flood and coastal erosion risk.
Improve and develop services based on lessons identified following flood events Table 9, Measure 5: Changes to operation and maintenance
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6 Newport Flood Risk Management Plan
objectives
Welsh Government’s National Strategy for managing flooding and coastal erosion
risk has set four overarching objectives:
reducing the consequences for individuals, communities, businesses and the
environment from flooding and coastal erosion;
raising awareness of and engaging people in the response to flood and coastal
erosion risk;
providing an effective and sustained response to flood and coastal erosion
events; and
prioritising investment in the most at risk communities.
Following the production of the National strategy NCC published its LFRMS that
takes forward the national strategies objectives. The 4 overreaching objectives
from the national plan take into account the social, economic and environmental
risks associated with flooding. To be consistent with the Flood Risk Regulations
requirements, NCC’s LFRMS objectives focus around the reduction of potential
adverse consequences of flooding for human health, the environment, cultural
heritage, economic activity and if considered appropriate on local community
facilities.
NCC set objectives for Newport’s LFRMS by translating the four overarching
objectives of the National Strategy into objectives specific to Newport. These
objectives are aimed at reducing the consequences of flood risk arising from local
sources and coastal erosion risk, and address the short term (0-20 years), the
medium term (20-50 years) and the long term (50-100 years) outcomes of the
strategy. This ensures that the objectives are also consistent with the requirements
of the Regulations. The objectives are summarised in the Table below.
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Table 8 - Objectives of the National FRM Strategy and the NCC LFRMS
Overarching objectives of the National Strategy Objectives of NCC’s LFRMS Social Economic Environmental
Reducing the consequences for individuals, communities,
businesses and the environment from flooding and coastal
erosion.
Provide strategic leadership for assessment and management of flood risk arising
from local sources and coastal erosion
Reduce number of people exposed to flooding
Reduce risk to life (flooding of significant depth and velocity)
Reduce the number of residential and commercial properties affected by the risk
of flooding
Reduce disruption to essential services and critical infrastructure
Minimise damage to environmentally sensitive sites
Develop effective land use and land management policies, and development
management procedures
Prepare an asset maintenance and management plan
Raising awareness of and engaging people in the response
to flood and coastal erosion risk.
Ensure that those living in areas susceptible to local flood and coastal erosion
risks are aware of it and understand what actions they can take to improve their
protection
Ensure that NCC works in partnership with all Management Authorities and
works collaboratively with adjacent Authorities for successful implementation of
the strategy
Providing an effective and sustained response to flood and
coastal erosion events.
Prepare emergency response plans and test their implementation
Respond to flood incidents and implement subsequent recovery measures in a
timely manner
Prioritising investment in the most at risk communities. Prepare a programme of investment for flood and coastal erosion risk
management based on a cost benefit analysis for communities at risk
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7 How Newport City Council will manage
flood risk at a local level
Local flood risk will be managed on a ward boundary scale. This provides a
suitable level of granularity whilst directly linking into NCC governance
structures.
Measures have been identified and informed by:
Records of known historic local flooding incidents (see Appendix 1) were
provided by NCC on 31st July 2015, supplementing records in NCC’s PFRA.
South Wales Fire and Rescue recorded attendance at incidents classed as
‘flooding’ between June 2009 and June 2015. Minor flooding and non-surface
water flooding such as pipe bursts or sewer flooding was screened out where
information was available.
NCC asset informations supplemented by workshops held in September 2015
with NCC drainage engineering and operational staff to capture known
operational, maintenance and safety issues.
Flood risk analysis of surface water mapping.
7.1 Overview of local flood risk
The following tables and plans provide an initial overview of surface water flood
risk within the borough. Less densely populated wards have less property at risk
but otherwise the predicted risk is relatively spread across the borough.
The predominant flood risk throughout much of Newport is from the Rivers Usk
and Ebbw, and tidal flooding from the Severn Estuary. Flood risk from surface
water and ordinary watercourses is localised, exacerbated by blockages and/or
high tides restricting drainage.
The wards with the greatest proportion of residential properties at predicted risk of
surface water flooding are ranked below. The wards with a greater proportion of
properties at high predicted risk of surface water flooding include those with
steeper topography or adjoining the levels. The densely populated flatter, tidal
flood risk dominated wards have the greatest proportion of properties at low
predicted risk of surface water flooding.
Table 9 – Top five ranked wards, by proportion of properties at predicted flood risk
(depth>0.2m)
Rank High (>1 in 30
chance in any year)
Medium (1 in 30 to 1 in 100
chance in any year)
Low (1 in 100 to 1 in 1000
chance in any year)
1 Bettws Alway Victoria
2 Alway Bettws Pillgwenlly
3 Ringland St. Julians St. Julians
4 Allt-yr-Yn Beechwood Bettws
5 Graig Ringland Alway
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Table 10 – Summary of the predicted risk from surface water to a range of receptors.
High
(>1 in 30
chance in any
year)
Medium
(1 in 30 to 1 in 100
chance in any
year)
Low
(1 in 100 to 1 in
1000 chance in any
year)
Residents in areas at risk of flooding
(depth >0.0m) 734 2,251 15,288
Residential properties at risk of
internal flooding (depth >0.2m) 186 552 4,002
Essential Services (n) 7 10 52
Non-Residential Properties (n) 85 233 853
Primary/Trunk Roads (km) 37.7 88.8 267.3
Main Line Railways (km) 1.95 3.84 8.59
Agricultural Land - Grades 1, 2 and
3 (ha) 77 143 504
Special Areas of Conservation
(SAC) (ha) 0 0.05 0.35
Special Protection Areas (SPA) (ha) 0 0.03 0.19
Ramsar Sites (ha) 0 0.03 0.19
Sites of Special Scientific Interest
(SSSI) (ha) 13.19 34.91 217.74
Sites of Interest for Nature
Conservation (SINC) 45.35 70.32 129.41
National Nature Reserves (NNR)
(ha) 0 0.01 3.3
Local Nature Reserves (LNR) (ha) 0.44 0.56 0.87
Ancient Woodland (ha) 4.96 8.27 19.17
Registered Parks and Gardens (ha) 8.08 11.49 27.09
Country Parks (ha) 0.17 0.56 4.19
Scheduled Ancient Monuments
(SAM) (ha) 0.93 2.01 6.75
Listed Buildings (n) 12 18 36
Essential Settings of Regional
Planning Guidance (ha) 7.11 12.02 26.03
There are few instances of groundwater flooding in Newport.
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Table 11 - Estimated residents in areas at risk of flooding depth >0.0m
Ward
High
(>1 in 30
chance in any year)
Medium
(1 in 30 to 1 in 100
chance in any year)
Low
(1 in 100 to 1 in 1000
chance in any year)
Allt-yr-Yn 51 144 473
Alway 107 304 909
Beechwood 32 186 724
Bettws 181 311 1148
Caerleon 19 84 654
Gaer 9 51 459
Graig 53 102 371
Langstone 23 58 258
Liswerry 0 14 833
Llanwern 7 30 211
Malpas 12 46 295
Marshfield 12 16 135
Pillgwenlly 9 114 1206
Ringland 70 202 872
Rogerstone 16 118 810
Shaftesbury 26 88 677
St. Julians 58 181 1179
Stow Hill 28 121 422
Tredegar Park 0 0 724
Victoria 21 81 2928
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Table 12 - Residential Properties at risk of internal flooding depth >0.2m
Ward
High
(>1 in 30
chance in any year)
Medium
(1 in 30 to 1 in 100
chance in any year)
Low
(1 in 100 to 1 in 1000
chance in any year)
Allt-yr-Yn 19 0.5% 42 1.1% 100 2.6%
Alway 33 1.0% 102 3.1% 268 8.0%
Beechwood 4 0.1% 46 1.4% 205 6.0%
Bettws 43 1.3% 77 2.3% 312 9.3%
Caerleon 4 0.1% 11 0.3% 91 2.6%
Gaer 0 0.0% 7 0.2% 98 2.5%
Graig 12 0.5% 21 0.8% 66 2.7%
Langstone 6 0.3% 9 0.5% 38 2.2%
Liswerry 0 0.0% 0 0.0% 196 3.8%
Llanwern 3 0.2% 8 0.6% 24 1.9%
Malpas 3 0.1% 9 0.3% 44 1.3%
Marshfield 4 0.2% 5 0.2% 32 1.3%
Pillgwenlly 4 0.1% 20 0.6% 355 11.3%
Ringland 20 0.5% 43 1.1% 182 4.8%
Rogerstone 5 0.1% 18 0.4% 131 3.0%
Shaftesbury 7 0.3% 22 0.9% 196 8.0%
St. Julians 11 0.3% 62 1.6% 357 9.4%
Stow Hill 6 0.2% 27 1.1% 84 3.5%
Tredegar Park 0 0.0% 0 0.0% 148 7.7%
Victoria 2 0.1% 23 0.7% 1075 34.3%
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Table 13 – Total features at high risk of surface water flooding (greater than a 1 in 30 chance of flooding in any year)
All
t-y
r-Y
n
Alw
ay
Bee
chw
oo
d
Bet
tws
Cae
rleo
n
Gae
r
Gra
ig
Lan
gst
on
e
Lis
wer
ry
Lla
nw
ern
Mal
pas
Mar
shfi
eld
Pil
lgw
enll
y
Rin
gla
nd
Ro
ger
sto
ne
Sh
afte
sbu
ry
St.
Ju
lian
s
Sto
w H
ill
Tre
deg
ar
Par
k
Vic
tori
a
Residential Properties (n) flooding depth >0.2m 19 33 4 43 4 0 12 6 0 3 3 4 4 20 5 7 11 6 0 2
Essential Services (n) 4 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 2 0 0
Non-Residential Properties (n) 9 0 1 0 1 1 2 5 5 3 1 4 2 0 5 2 0 40 1 3
Primary/Trunk Roads (km) 1.6 1.0 0.8 2.0 1.5 1.6 4.2 3.0 0.8 3.5 0.5 4.1 1.1 3.9 3.2 1.3 1.6 1.1 0.3 0.6
Main Line Railways (km) 0.00 0.00 0.00 0.00 0.14 0.03 0.81 0.00 0.03 0.02 0.00 0.00 0.16 0.00 0.23 0.00 0.01 0.50 0.00 0.02
Agricultural Land - Grades 1, 2 and 3 (ha) 0 0 0 4 2 0 18 10 0 5 0 26 0 1 11 0 0 0 0 0
Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.74 0.00 3.62 0.00 8.82 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00
Sites of Interest for Nature Conservation (SINC) 1.43 0.12 0.00 13.53 6.22 3.15 5.85 1.51 0.00 2.12 0.68 0.24 0.02 1.06 8.03 0.27 0.03 0.00 1.09 0.00
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.44 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 0.00 0.00 0.00 0.57 0.40 0.00 1.19 0.70 0.00 0.37 0.06 0.06 0.00 0.01 1.60 0.00 0.00 0.00 0.00 0.00
Registered Parks and Gardens (ha) 0.40 0.00 0.23 0.00 0.00 2.62 0.17 0.09 0.00 4.15 0.00 0.38 0.00 0.00 0.00 0.01 0.00 0.03 0.00 0.00
Country Parks (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.17 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 0.33 0.00 0.00 0.36 0.00 0.00 0.00 0.01 0.00 0.00 0.23 0.00 0.00 0.00 0.00 0.00
Listed Buildings (n) 2 0 0 1 0 0 5 0 0 0 0 2 0 0 0 1 0 1 0 0
Essential Settings of Regional Planning Guidance (ha) 0.00 0.00 0.00 0.00 0.72 0.00 0.39 2.22 0.00 3.71 0.00 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
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Table 14 - Total features at medium risk of surface water flooding (between 1 in 30 and 1 in 100 chance of flooding in any year)
All
t-y
r-Y
n
Alw
ay
Bee
chw
oo
d
Bet
tws
Ca
erle
on
Ga
er
Gra
ig
La
ng
sto
ne
Lis
wer
ry
Lla
nw
ern
Ma
lpa
s
Ma
rsh
fiel
d
Pil
lgw
enll
y
Rin
gla
nd
Ro
ger
sto
ne
Sh
aft
esb
ury
St.
Ju
lia
ns
Sto
w H
ill
Tre
deg
ar
Pa
rk
Vic
tori
a
Residential Properties (n) flooding depth >0.2m 42 102 46 77 11 7 21 9 0 8 9 5 20 43 18 22 62 27 0 23
Essential Services (n) 4 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 4 0 0
Non-Residential Properties (n) 11 7 2 1 5 4 4 7 11 7 1 6 28 1 12 2 2 113 2 7
Primary/Trunk Roads (km) 3.9 3.3 2.3 3.9 3.9 4.2 7.9 5.8 3.9 5.3 1.6 8.4 4.2 7.6 7.7 3.5 4.2 2.8 1.4 3.0
Main Line Railways (km) 0.00 0.00 0.00 0.00 0.45 0.20 1.20 0.00 0.05 0.07 0.00 0.00 0.43 0.00 0.52 0.00 0.03 0.84 0.00 0.05
Agricultural Land - Grades 1, 2 and 3 (ha) 0 0 0 6 3 0 29 19 2 10 0 53 0 2 17 0 0 0 2 0
Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.01 0.00 0.00 0.00 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI) (ha) 0.00 0.00 0.00 0.00 0.01 0.00 0.03 1.47 0.12 9.62 0.00 23.45 0.02 0.00 0.00 0.00 0.00 0.00 0.19 0.00
Sites of Interest for Nature Conservation (SINC) 1.98 0.61 0.01 23.69 8.26 3.88 7.76 3.23 0.16 3.29 1.22 0.47 0.29 2.23 11.37 0.40 0.14 0.00 1.33 0.00
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.56 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 0.00 0.00 0.00 0.76 0.50 0.00 1.79 1.88 0.00 0.71 0.12 0.08 0.00 0.07 2.36 0.00 0.00 0.00 0.00 0.00
Registered Parks and Gardens (ha) 0.65 0.00 0.34 0.00 0.00 3.64 0.31 0.10 0.00 5.35 0.00 0.98 0.00 0.00 0.00 0.02 0.00 0.10 0.00 0.00
Country Parks (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.55 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00
Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 0.76 0.01 0.01 0.77 0.00 0.00 0.00 0.02 0.00 0.00 0.44 0.00 0.00 0.00 0.00 0.00
Listed Buildings (n) 5 0 0 1 0 0 5 0 0 0 0 2 0 0 1 1 0 3 0 0
Essential Settings of Regional Planning Guidance (ha) 0.00 0.00 0.00 0.00 1.46 0.00 1.00 3.92 0.00 5.37 0.00 0.27 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
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Table 15 - Total features at low risk of surface water flooding (between 1 in 100 and 1 in 1000 chance of flooding in any year)
All
t-y
r-Y
n
Alw
ay
Bee
chw
oo
d
Bet
tws
Ca
erle
on
Ga
er
Gra
ig
La
ng
sto
ne
Lis
wer
ry
Lla
nw
ern
Ma
lpa
s
Ma
rsh
fiel
d
Pil
lgw
enll
y
Rin
gla
nd
Ro
ger
sto
ne
Sh
aft
esb
ury
St.
Ju
lia
ns
Sto
w H
ill
Tre
deg
ar
Pa
rk
Vic
tori
a
Residential Properties (n) flooding depth >0.2m 100 268 205 312 91 98 66 38 196 24 44 32 355 182 131 196 357 84 148 1075
Essential Services (n) 6 0 1 3 1 4 1 2 4 2 1 0 5 1 2 3 2 10 0 4
Non-Residential Properties (n) 18 20 18 23 21 17 14 24 56 42 2 23 149 4 56 41 53 184 13 75
Primary/Trunk Roads (km) 12.9 10.9 8.6 9.6 12.0 12.3 17.1 15.8 22.1 12.7 5.6 24.8 16.1 17.2 20.7 10.1 10.2 8.5 9.0 11.1
Main Line Railways (km) 0.00 0.00 0.00 0.00 1.12 0.64 1.70 0.00 0.11 0.72 0.00 0.02 1.18 0.00 1.56 0.00 0.11 1.36 0.01 0.06
Agricultural Land - Grades 1, 2 and 3 (ha) 0 0 0 11 7 0 74 58 18 64 1 215 0 5 34 0 0 0 17 0
Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.02 0.00 0.06 0.00 0.00 0.07 0.02 0.00 0.00 0.17 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.17 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.17 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI) (ha) 0.00 0.00 0.02 0.00 0.06 0.00 0.30 4.79 8.70 69.88 0.00 132.8 0.12 0.00 0.00 0.00 0.01 0.00 1.06 0.00
Sites of Interest for Nature Conservation (SINC) 2.98 2.00 0.05 41.38 17.79 5.08 11.98 7.88 4.98 9.32 1.93 1.39 0.39 2.88 15.84 0.63 1.31 0.00 1.60 0.00
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.04 1.31 1.95 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.87 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 0.05 0.00 0.00 1.18 0.96 0.00 4.25 4.00 0.00 2.33 0.24 0.26 0.00 0.49 5.37 0.04 0.00 0.00 0.00 0.00
Registered Parks and Gardens (ha) 1.74 0.00 0.87 0.00 0.00 7.75 0.83 0.11 0.00 10.24 0.02 5.06 0.00 0.00 0.00 0.08 0.00 0.39 0.00 0.00
Country Parks (ha) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.07 0.00 0.00 0.00 0.00 0.00 0.00 0.12 0.00
Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00 3.13 0.09 0.02 2.40 0.00 0.10 0.00 0.03 0.00 0.00 0.97 0.00 0.00 0.01 0.00 0.00
Listed Buildings (n) 6 0 0 2 1 0 6 1 0 0 0 5 0 0 3 2 0 10 0 0
Essential Settings of Regional Planning Guidance (ha) 0.00 0.00 0.00 0.00 5.24 0.00 2.95 7.93 0.00 9.06 0.00 0.85 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
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7.2 Common local flood risk management measures
The following measures have been identified common to all wards in the borough.
7.2.1 Maintain flood asset register
NCC will continue to develop and regularly update, a register of all flood risk
assets that are likely to influence local flood risk and coastal erosion. This register
contains details of the condition and ownership of these structures and features
and will be supplemented with an asset maintenance plan for assets owned by
NCC.
7.2.2 Flood investigations
NCC will investigate flooding, when it is considered necessary and appropriate, to
establish the cause, inform the appropriate risk management authorities, and
propose mitigation measures. This will include providing guidance on how to
report a flood incident, contact details and signposting to NRW guidance on
preparing flood plans.
7.2.3 Community flood awareness and resilience
NCC, in conjunction with the RMAs, will liaise with local communities and
businesses to raise awareness on flood risks. This will include encouraging
participation from willing local communities and businesses in managing local
flood risk. This will include signposting to available resources from NRW28.
7.2.4 Culvert inlet grid maintenance safety and operation
review
NCC manage the risk of culvert inlet grid blockage by cleaning and maintaining
inlets (see Section 4.1.1). The grids also prevent unauthorised access. The risk
posed by all grids will be reviewed, validating those grids currently considered
‘critical’. Grid risk will be prioritised based on likelihood and consequence of
blockage.
The requirements of the Health & Safety at Work Act 1974 places a duty of care
on NCC to ensure as far as reasonably practical, the health, safety and welfare at
work of all of their employees. A prioritised programme to review grids and
identify works necessary to ensure all meet minimum standards of safety is
planned. This will consider whether a grid has a safe access route and working
area to clear the screen of debris, material management/storage arrangements, and
whether the grid arrangement is appropriate to reduce the risk of blockage and
unauthorised entry whilst minimising the likelihood of debris build-up. Work will
be completed with reference to NRW guidance on Trash and Security Screens.
28 What to do before, during and after a flood. Available from:
http://naturalresources.wales/flooding/what-to-do-before-during-and-after-a-flood/?lang=en
Accessed on 2/10/15.
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Planned and reactive grid maintenance protocols will be reviewed on the basis of
grid risk to optimise and prioritise resources. Grids with the highest risk will be
reviewed as to whether simple remote telemetry to trigger clearance would be
justified. Grids with the lowest risk may be considered for alternative maintenance
approaches on a case by case basis.
7.2.5 Highway surface water gully maintenance
NCC clean all road drains (also called surface water gullies) across the city at
least once a year and reported blocked gullies, provided they can gain access (see
Section 4.1.1).
In some parts of the NCC, the likelihood of blockage is greater for example
parked vehicles frequently obstructing maintenance access and/or deciduous trees.
NCC will review its gully cleansing programme and consider opportunities to
optimise the service based on consideration of the likelihood and impact of a
blockage.
7.2.6 Surface water and land drainage disconnection from
combined sewers
Many parts of the borough are served by a single sewer pipe that has to cope with
both storm and foul water, serving properties and generally highway gullies.
During periods of heavy rainfall, more water gets into the network than it can
cope with. This often causes controlled overflows into rivers and sometimes even
sewer flooding. Direct land drainage may connect to the combined sewer network.
The amount of wastewater requiring treatment and pumping is also increased,
resulting in higher operational costs.
DCWW have an active programme to reduce the surface water entering their
sewers and where possible catch, redirect and slow down the speed at which
surface water enters the sewer, using a range of techniques as part of the
RainScape programme. Such techniques have multiple benefits and are often
undertaken as part of public realm improvements.
NCC will engage with DCWW’s RainScape programme. It is recommend that
prioritised investigations identify historically captured streams and springs into
the combined sewer network29.
7.2.7 Catchment restoration and natural flood management
Natural flood management (NFM) is the alteration, restoration or use of landscape
features to reduce flood risk30. Peak flow is reduced during intense storm events
by working with natural processes to protect, restore and emulate the natural
29 See: Broadhead et al (2015) Finding lost streams and springs captured in combined sewers: a
multiple lines of evidence approach. Available at:
http://onlinelibrary.wiley.com/doi/10.1111/wej.12104/abstract 30 Parliamentary Offices of Science and Technology. (2011, December). Natural Flood
Management.
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function of catchments, rivers and flood plains. Such an approach provides
biodiversity and water quality benefits, and is aligned with meeting WFD
catchment restoration objectives and the Water Strategy for Wales.
The Pitt Review31 identified three types of NFM measures:
Water retention through management of infiltration, in particular by protecting
or enhancing soil condition;
Provision of catchment-wide flood water storage such as retention ponds,
floodplain woodlands, or enhanced wetlands and washlands;
Slowing the flow of water by improving the management of river and adjacent
land, including the planting of cover crops and the restoration of smaller
watercourses to a more natural alignment.
Several wards in Newport have largely rural upland sub-catchments, downstream
populated communities and culverted watercourses. Glastir Advance identifies
part of the east of the borough with potential for management to reduce flood risk
and protect water supplies. No locations within the borough were identified by
this mapping as a priority for Water Quality interventions.
Figure 6 - Glastir Advanced Water Quantity Mapping32 showing in green where land
management practices are considered likely to reduce flood risk and protect water
supplies for over 60-70% of the catchment.
Further prioritised investigation with NRW is proposed to prioritise further work,
drawing on the available scoping information including and Forest Research33.
31 The Pitt Review: Lessons learnt from the 2007 Floods (Cabinet Office, 2008) 32 Glastir Advance Mapping. Available from:
http://gov.wales/topics/environmentcountryside/farmingandcountryside/farming/schemes/glastir/gl
astir-advanced/?lang=en Accessed 1/10/15. 33 In 2014, the Environment Agency commissioned Forest Research to identify opportunities for
woodland creation to reduce diffuse pollution and flood risk across England and Wales. High-level
opportunity maps at a (scale of 1 km2) identify parts of Newport as priority areas in catchments of
river waterbodies at risk of failing good status due to diffuse pollutant loads (Nitrate, Phosphate,
Sediment, Pesticides and Faecal Indicator Organisms); areas at risk from flooding from rivers and
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NCC, in conjunction with the RMAs, will provide advice to supportive
landowners on sustainable land use management aiming at improving the risk of
flooding. Sustainable land management should consider aspects such as
environmental enhancement, habitat restoration and habitat creation, all of which
can play a role in alleviating flood risk.
surface water and priority areas where runoff from soils is rapid and finally include information on
constraints to woodland planting. In these locations woodland planting could deliver positive
outcomes for water quality and/or flood risk management. See: http://www.forestry.gov.uk/fr/infd-
97xgxx Accessed on 01/10/15.
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7.2.8 Summary of Measures
Table 16 – Summary of Borough-wide Measures
Location and
Description
Measure Timescale Indicative Cost Strategic
Context
1 Borough-wide Develop and
publish flood
asset register
Short term
(0-5years)
N/A (Revenue) M35
2 Borough-wide Maintain flood
asset register
Ongoing N/A (Revenue) M35
3 Borough-wide Review flood
events and
lessons learnt
Ongoing N/A (Revenue) M53
4 Borough-wide Flood reporting
guidance on
NCC website
Short term
(0-5years)
N/A (Revenue) M53
5 Borough-wide Community
flood awareness
& website update
Ongoing N/A (Revenue) M53
6 Various – 87
culvert inlet
grids
Visual inspection
and prioritisation
Ongoing 10 days FTE M35,
M44
7 Various – 10
critical and 5
H&S failing
culvert inlet
grids
Investigation of
inlet grids
Short term
(0-5years)
£100k nominal estimate
(Inspection £3k + Design
£5k + contingency (30%)
= £10k each)
M35,
M44
8 Various – 10
critical culvert
inlet grids
Replace inlet
grids and
associated access
works
Short term
(0-5years)
£190k nominal estimate
(Replacement screen £3k
+ Access works £8k +
prelims/supervision
(30%) + contingency
(30%) = £19k each)
M35,
M44
9 Various –
Assumed 10
H&S failing
culvert inlet
grids
Address H&S
defects
Short term
(0-5years)
£140k nominal estimate
(Access works £8k +
prelims/supervision
(30%) + contingency
(30%) = £14k each)
M35,
M44
11 Road gullies Review prog. Ongoing 5days FTE M35
12 Borough-wide Engage with
DCWW works to
reduce surface
water and land
drainage entering
the sewer
network.
Ongoing N/A (Liaison with
DCWW)
M34
13 Borough-wide Prioritised high-
level
investigation into
Catchment
Restoration and
NFM.
Short term
(0-
20years)
N/A (Revenue) M31
Total (non-revenue) 15days FTE & £430k
Recovery and review Preventing
3 0
5 8
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
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7.3 Allt-Yr-Yn Ward
7.3.1 Overview
Allt-Yr-Yn Ward is situated in the central part of NCC, to the west of central
Newport. It has a population of 8,78234 and covers an area of 3.83km2, which is
approximately 1.8% of the total area of Newport at 217km2 35. Allt-Yr-Yn slopes
down gently north-west to east. The ward is heavily concentrated with residential
properties, however to the north of the ward open green space dominates. On the
west side of Allt-yr-Yn heights there is a Local Nature Reserve containing ancient
woodland and meadows. There are no Main Rivers in this ward.
7.3.2 Ordinary watercourses and surface water flood risk
The available data indicates limited flooding from ordinary watercourses which
potentially affect a limited number of highways and properties across the urban
area. Problems may also occur in more isolated locations, for example due to
culvert restrictions. As many of the ordinary watercourses are culverted where
they pass through developed areas it is difficult to distinguish between surface
water flooding and flooding from ordinary watercourses.
There are no reported instances of historical flooding from ordinary watercourses
in this ward.
Historic flood information details two instances of flooding due to surface water
in Allt-Yr-Yn which are detailed in the table below. In general these reported
flood incidents relate to surface water flooding where the drainage systems cannot
cope with high intensity rainfall. The reported flood incidents may also relate to
blocked gullies or drains.
Table 17 – Recorded historic local flooding in Allt-yr-yn
Location of Historic Flooding Reason
St Woolos Cemetery Storm Water system issue
Llanthewy Rd j/w Bryngwyn
Rd
Surface Water Flooding/culvert flooding
The table below summarises the impacts of flooding in Allt-Yr-Yn based on the
Surface Water Flood map. The surface water flood maps show flooding
potentially affecting roads and properties which can be broadly clustered into
three main areas, two in the vicinity of Fields Park road near the centre of the
ward and one near Caerau Road in the east of the ward. The areas are affected are
generally classified as low risk, however there are a number of isolated areas of
high/medium risk. The surface water flood maps take a generalised approach to
the representation of drainage systems however the mapping is indicative of areas
most affected during high intensity storms or due to blockages.
34 Office for National Statistics (ONS) 2012 Mid-Year Population Estimate 35 Allt-Yr-Yn Ward Profile (2014) Newport City Council
Newport City Council Newport Local Flood Risk Management
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Table 18 – Flood risk map counts for Allt-yr-yn
Totals in
Defined
Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100 to
1 in 1000
chance in
any year)
Estimated residents in areas at risk of flooding
depth >0.0m
People (multiplier 2.32, Newport average
household size 2010)
9064 51 144 473
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
3907 19 42 100
Essential Services 66 4 4 6
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 136 9 11 18
Primary/Trunk Roads (km) 48.5 1.6 3.9 12.9
Mail Line Railways (km) 0.00 0.00 0.00 0.00
Agricultural Land - Grades 1, 2 and 3 (ha) 383 0 0 0
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI) (ha) 0.00 0.00 0.00 0.00
Sites of Interest for Nature Conservation
(SINC) (ha) 47.86 1.43 1.98 2.98
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 19.98 0.44 0.56 0.87
Ancient Woodland (ha) 8.04 0.00 0.00 0.05
Registered Parks and Gardens (ha) 23.70 0.40 0.65 1.74
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00
Listed Buildings (n) 37 2 5 6
Essential Settings of Regional Planning
Guidance (ha) 0.00 0.00 0.00 0.00
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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7.3.3 Groundwater
There are no recorded groundwater flood incidents.
7.3.4 Sewer Flooding
There are 31 reported instances of DG5 sewer flooding in this ward.
7.3.5 Measures to reduce local flood risk
The main local flood risks are identified as follows:
Sorrel Drive/Fields Park Road – A number of residential properties are
predicted to be at risk in this location. Whilst there have been no historic
surface water flooding incidents, some sewer flooding is recorded. There are
two culverted ordinary watercourses. No grids are maintained by NCC.
Further investigation is proposed as records are incomplete as to the inlet
arrangement of the culvert. Monitoring is proposed. There may be
opportunities linking to the adjacent Allt-yr-Yn SINC.
St Woolos Cemetery – NCC have recently taken over maintenance of a culvert
from ordinary watercourse serving the cemetery which drains through a filter
bed. Historic ponding of surface water is recorded. Whilst maintenance has
addressed some historic issues, the culvert remains partially blocked at the
outlet following encroachment into the channel. Further investigation is
proposed, which is likely to recommend a new culvert (50m) and outfall.
Woodville Road / Risca Road / Western Avenue – A number of residential
properties and services are predicted to be at medium risk in this location.
There area is served by an adjacent culverted ordinary watercourse. No
records of historic flooding are available. No grids are maintained by NCC in
the upstream area however downstream there is the Nant Coch, Western
Avenue culvert inlet grid which has been identified as ‘critical’ by NCC.
Further investigation is proposed as records are incomplete as to the inlet
arrangement including opportunities for ‘daylighting’ the culverted sections of
the Nant Coch where adjacent open space allows in the Glasllwch playing
fields and Coed-Melyn Park. Monitoring is proposed.
Llanthewy Road/Caerau Road – A number of residential properties and
services are predicted to be at high/medium risk in this location. The area is
served by a combined sewer network with some sewer flooding recorded.
Highway ponding had been experienced due to blocked gullies however NCC
has installed additional gullies and regularly clear them of leaves and other
debris. Continued enhanced highway maintenance is proposed in the short
term, combined with monitoring.
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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The following measures are identified to reduce flood risk.
Table 19 – Local flood risk management measures for Allt-yr-yn
Location and
Description
Measure Timescale Indicative Cost Strategic
Context
A1 Sorrel
Drive/Fields
Park Road
Investigate inlet Short term
(0-5 years)
2days FTE M24
A2 Monitor Ongoing N/A (Revenue) M53, M44
A3 St Woolos
Cemetery
Investigate.
Short term
(0-5 years)
£10-20k estimate M24
A4 Replace culvert
and outfall.
Short term
(0-5 years)
Enabling costs
(20%) £20k.
80m culvert
assumed 750mm
dia estimated
between £100k-
£160k
M34
A5 Fields Park
Road/Risca
Road
Investigate inlet
and ‘daylighting’
culverts.
Short term
(0-5 years)
£10-30k estimate M24
A6 Culvert
improvement
works
Medium
term (5-10
years)
Nominal estimate
£50k - £150k
M33
A7 Monitor Ongoing N/A (Revenue) M53, M44
A8 Llanthewy
Road/Caerau
Road
Enhanced
highway drainage
maintenance.
Ongoing N/A (Revenue) M35
A9 Monitor. Ongoing N/A (Revenue) M53, M44
Total (non-revenue) 2days FTE & £170-360k
Recovery and review Preventing
3 3
3 3
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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7.4 Alway Ward
7.4.1 Overview
Alway Ward is situated in the central part of NCC, to the east of Central Newport.
It has a population of approximately 8,37134 and an area of 1.76km2, which is
approximately 0.8% of the total area of Newport36. The Ward gently slopes down
towards the Great Western railway to the south and the M4 motorway to the
north, and mainly consists of residential housing.
There are three significant surface water flooding locations, showing a 30 year
extent, within the ward boundary. There are no Main Rivers in this ward.
7.4.2 Ordinary watercourses and surface water flood risk
Culverted ordinary watercourses drain much of the ward. Ponding is shown
upstream of the inlet screen Aberthaw Road within the allotment gardens.
The available data indicates pockets of flooding associated with ordinary
watercourses which potentially affect a number of highways and properties in
three main areas in the south and east of the ward. Problems may also occur in
other areas, for example due to culvert restrictions. As many of the ordinary
watercourses are culverted where they pass through developed areas it is difficult
to distinguish between surface water flooding and flooding from ordinary
watercourses.
The surface water flood maps show flooding potentially affecting roads and
properties which can be broadly clustered into three main areas, two in the south
of the ward near Conway Road and near Liswerry Drive, and one in the east of the
ward in the vicinity of Ringland Road. These three areas are adjacent to ordinary
watercourses. The two areas in the south of the ward are classified as
medium/high risk and the area to the east is generally classified as low risk. The
surface water flood maps take a generalised approach to the representation of
drainage systems however the mapping is indicative of areas most affected during
high intensity storms or due to blockages.
Historic flood information details one record of flooding due to surface water in
Alway which is detailed in the table below. This reported flood incident relates to
surface water flooding from a blocked trash screen; it is likely that other flooding
in the area is caused when similar drainage systems cannot cope with high
intensity rainfall. Flooding may also relate to blocked gullies or drains.
Table 20 – Recorded historic local flooding in Alway
Location of Historic Flooding Reason
Ringland Circle Surface water flooding caused by blocked inlet
grid on a culverted ordinary watercourse.
Affected approximately 28 residential properties.
36 Alway Ward Profile (2014) Newport City Council
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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The table below summarises the impacts of flooding in Alway based on the
Surface Water Flood map, shown below.
Table 21 – Flood Risk Map counts for Alway
Totals in
Defined
Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100 to
1 in 1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
7742 107 304 909
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
3337 33 102 268
Essential Services 22 0 0 0
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 69 0 7 20
Primary/Trunk Roads (km) 27.2 1.0 3.3 10.9
Mail Line Railways (km) 0.37 0.00 0.00 0.00
Agricultural Land - Grades 1, 2 and 3 (ha) 177 0 0 0
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI)
(ha) 0.00 0.00 0.00 0.00
Sites of Interest for Nature Conservation
(SINC) (ha) 20.25 0.12 0.61 2.00
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 3.36 0.00 0.00 0.00
Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00
Listed Buildings (n) 2 0 0 0
Essential Settings of Regional Planning
Guidance (ha) 0.00 0.00 0.00 0.00
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Newport City Council Newport Local Flood Risk Management
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7.4.3 Groundwater
There are no recorded groundwater flood incidents.
7.4.4 Sewer Flooding
There are 4 reported instances of DG5 sewer flooding in this ward.
7.4.5 Measures to reduce local flood risk
The main local flood risks are identified as follows:
Ringland Circle/Stanford Road – A high number of residential properties are
predicted to be at medium risk in this location. The historic surface water
flooding incident is attributed to a culvert inlet grid blockage. The fire service
records include the pumping out a sheltered housing unit. NCC have since
installed grid overflows, the grids have been identified as ‘critical’ for
clearance. Sewer flooding to a number of properties is recorded however the
sewerage is recorded to be a separate foul and storm system. The culverted
ordinary watercourse discharges downstream into a storage lagoon structure
and further investigation into ownership responsibilities and water level
management is planned (see Section 7.16.5, Ringland Ward). Monitoring and
further investigation is proposed of the culvert capacity and inlet arrangement.
Ringland Avenue/Dents Hill – A small number of residential properties are
predicted at risk in this location. Lack of maintenance of the culverted
watercourse has been highlighted to present a blockage risk. Liaison with
riparian owners is planned.
Liswerry Park Drive – Localised highway ponding occurs when highway
gullies become blocked along the railway underpass. A number of residential
properties are predicted at risk however no flooding is recorded in this
location. The area would be prone to surface water ponding if a culvert
adjacent and under the railway were to become blocked. Investigation into
maintenance responsibilities and inlet arrangement is planned. Adjacent
Lliswerry Playing Fields and Angling Ponds SINC may offer additional
attenuation storage to hold back peak flows, should an intervention be
justified.
Somerton Road – A large number of residential properties are predicted at
high risk however no recent incidents have been recorded. It is likely that the
predictions are precautionary given that culverts run adjacent and under the
railway. Attenuation storage to hold back peak upstream flows in Beechwood
Park and the Aberthaw Road allotments should be considered. Investigation
into the culvert capacity, inlet arrangement and maintenance responsibility is
planned. There are anecdotal reports of historic surface water flooding during
intense rainfall as drainage systems serving the area south of Chepstow Road
became overwhelmed. Highway gullies drain into the combined sewer
network.
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Gibbs Road – Highway ponding is predicted and there have been two
incidents requiring fire service pumping. Further investigation of the highway
drainage and adjacent culvert is proposed.
The following measures are identified to reduce flood risk.
Table 22 - Local Flood Risk Management measures for Alway
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
B1 Ringland
Circle/Stanford
Road
Investigate and establish
local flood action group to
monitor & assist with debris
clearance.
Short term
(0-5)
3days FTE
and £5k
(public
meeting)
M43,
M44
B2 Investigate culvert capacity
and identify hydraulic pinch-
points.
Short term
(0-5 years)
£5-10k M24,
M53
B3 Monitor Ongoing N/A
(Revenue)
M53,
M44
B4 Ringland
Av/Dents Hills
Liaison with riparian owners
regarding
maintenance/operation
responsibilities.
Short term
(0-5 years)
1day FTE M24,
M43
B5 Monitor Ongoing N/A
(Revenue)
M53,
M44
B6 Liswerry Park
Drive
Investigate culvert
maintenance responsibilities
and risk of blockage.
Short term
(0-5 years)
3days FTE
plus £2k
survey
M24
B7 Inlet improvement works
allowance
Short term
(0-5 years)
£20-40k
(nominal
estimate)
M33
B8 Monitor Ongoing N/A M53,
M44
B9 Somerton Road Investigate culvert
maintenance responsibilities
and risk of blockage.
Consider upstream
attenuation options.
Short term
(0-5 years)
5days FTE M24,
M34
B10 Enhanced highway drainage
maintenance.
Ongoing N/A
(Revenue)
M35
B11 Inlet improvement works
allowance
Short term
(0-5 years)
£20-40k
(nominal
estimate)
M33
B12 Monitor Ongoing N/A
(Revenue)
M53
B13 Gibbs Road Investigate culvert and
highway drainage
Short term
(0-5 years)
3days FTE M24
B14 Enhanced highway drainage
maintenance.
Short term
(0-5 years)
N/A
(Revenue)
M35
B15 Monitor Ongoing N/A
(Revenue)
M53,
M44
Total (days non-revenue) 15days FTE & £30-57k
Recovery and review Preventing
6 5
7 5
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
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7.5 Beechwood Ward
7.5.1 Overview
Beechwood Ward is situated in the central part of NCC, to the east of Central
Newport. It has a population of approximately 7,58534 and an area of 1.52km2,
which is approximately 0.7% of the total area of Newport37. The ward steeply
slopes north to south and mainly consists of residential housing. The topography
is similar to Alway ward. The centre of the ward consist of Beechwood Park.
The Main River Usk borders the north of this ward
7.5.2 Ordinary watercourses and surface water flood risk
The available data indicates some degree of high risk flooding associated with the
area to the south of the ward from ordinary watercourses, ponding behind the
railway embankment, which potentially affects a limited number of highways and
properties in the south and east of the ward. Problems may also occur in isolated
locations, for example due to culvert restrictions. As many of the ordinary
watercourses are culverted where they pass through developed areas it is difficult
to distinguish between surface water flooding and flooding from ordinary
watercourses.
There are no reported instances of historical flooding from ordinary watercourses
in this ward.
The surface water flood maps show flooding potentially affecting roads and
properties which can be broadly clustered into two main areas. The first runs from
the top of Woodland Park Road in the centre of the ward down to Chepstow road
in the South West of the ward. This shows potential overland flow of water with a
medium/high risk to some properties. The second cluster is in the south of the
ward adjacent to the ordinary watercourse in the vicinity of Conway Road
alongside the railway and represents a medium/high risk. Other areas affected are
generally classified as low risk, however there are a number of isolated areas of
high/medium risk. The surface water flood maps take a generalised approach to
the representation of drainage systems however the mapping is indicative of areas
most affected during high intensity storms or due to blockages.
Historic flood information details three instances of flooding due to surface water
in Beechwood. These incidents relate to surface water flooding where the
drainage systems cannot cope with high intensity rainfall.
Table 23 – Recorded historic local flood events in Beechwood
Location of Historic Flooding Reason
Heather Road, Beechwood Surface Water Flooding (Flash Flood)
Christchurch Road, Beechwood Surface Water Flooding (Flash Flood)
Woodland Road, Beechwood Surface Water Flooding (Flash Flood)
37 Beechwood Ward Profile (2014) Newport City Council
Newport City Council Newport Local Flood Risk Management
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The table below summarises the impacts of flooding in Beechwood based on the
Surface Water Flood map, shown below.
Table 24 – Flood Risk Mapping counts for Beechwood
Totals in
Defined Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100 to
1 in 1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
7890 32 186 724
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
3401 4 46 205
Essential Services 27 0 0 1
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 60 1 2 18
Primary/Trunk Roads (km) 28.1 0.8 2.3 8.6
Mail Line Railways (km) 0.00 0.00 0.00 0.00
Agricultural Land - Grades 1, 2 and 3 (ha) 150 0 0 0
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 2.45 0.00 0.00 0.02
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI)
(ha) 2.45 0.00 0.00 0.02
Sites of Interest for Nature Conservation
(SINC) (ha) 1.77 0.00 0.01 0.05
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 0.00 0.00 0.00 0.00
Registered Parks and Gardens (ha) 11.96 0.23 0.34 0.87
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00
Listed Buildings (n) 4 0 0 0
Essential Settings of Regional Planning
Guidance (ha) 0.00 0.00 0.00 0.00
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
Newport City Council Newport Local Flood Risk Management
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7.5.3 Groundwater
There are no recorded groundwater flood incidents.
7.5.4 Sewer Flooding
There are 7 reported instances of DG5 sewer flooding in this ward.
7.5.5 Measures to reduce local flood risk
The main local flood risks are identified as follows:
Conway Road – As with Somerton Road in Alway Ward, there are
anecdotal reports of historic surface water flooding during intense rainfall
as drainage systems serving the area south of Chepstow Road became
overwhelmed. A high number of residential properties are predicted at
high risk however no recent incidents have been recorded. Highway
gullies drain into the combined sewer network. Culverts run adjacent and
under the railway. Investigation into the arrangement and maintenance
responsibilities is planned.
St Julian’s Road / Lundy Drive – A small number of residential properties
are predicted at risk where a topographic depression causes surface water
to pond. Highway drainage gullies are understood to be served by a
combined sewer network and some sewer flooding has been recorded.
Further investigation is planned. Regular monitoring and gully clearance is
planned. Liaison with DCWW is also proposed on surface water
disconnection opportunities.
Forest Glade / Woodland Road / Kensington Place – A number of
residential properties are predicted to be at medium risk as a topographic
depression causes surface water ponding. Historic flooding is recorded by
NCC to one property and three flooding incidents have required Fire
Service attendance. The area has a high number of trees and leaves which
can clog or block highway gullies. Additional gullies have been recently
installed by NCC. Investigation into disconnection of highway gullies and
attenuation storage to hold back peak upstream flows in available open
space in Woodland Park is planned. Regular monitoring and gully
clearance is planned.
Cotman Close – A cluster of several properties are predicted at
low/medium risk of flooding. No incidents have been recorded and further
investigation is planned, given the area is likely to benefit from adjacent
motorway drainage.
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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The following measures are identified to reduce flood risk.
Table 25 - Local Flood Risk Management measures for Beechwood
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
C1 Conway Road Investigate culvert
maintenance
responsibilities and risk
of blockage.
Short term
(0-5 years)
3days FTE
M24
C2 Enhanced highway
drainage maintenance.
Ongoing N/A
(Revenue)
M35
C3 Inlet improvement
works allowance
Short term
(0-5 years)
£20-40k
(nominal
estimate)
M33
C4 Monitor Ongoing N/A
(Revenue)
M53, M44
C5 St Julian’s Road /
Lundy Drive
Enhanced highway
drainage maintenance.
Ongoing N/A
(Revenue)
M35
C6 Liaison with DCWW
on surface water sewer
disconnection
opportunities.
Short term
(0-5 years)
5days FTE
M24, M34
C7 Monitor Ongoing N/A
(Revenue)
M53, M44
C8 Forest Glade /
Woodland Road /
Kensington Place
Investigate highway
gully disconnection.
Short term
(0-5 years)
3day FTE
plus £5k
survey
M24
C9 Enhanced highway
drainage maintenance.
Ongoing N/A
(Revenue)
M35
C10 Monitor Ongoing N/A
(Revenue)
M53, M44
C11 Cotman Close Investigate drainage
maintenance
responsibilities.
Short term
(0-5 years)
2days FTE
M24
C12 Monitor Ongoing N/A
(Revenue)
M53, M44
Total (non-revenue) 13 days FTE and £25-
45k
Recovery and review Preventing
4 4
4 5
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
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7.6 Bettws Ward
7.6.1 Overview
Bettws Ward is situated in the northern part of NCC, to the north of Central
Newport. It has a population of approximately 7,64434 and an area of 5.14km2,
which is approximately 2.4% of the total area of Newport38. The ward gently
slopes north-west to south-east, with predominantly residential housing. There is
some commercial buildings within the valley floor. Surrounding this developed
area the land-use is composed of forestry, livestock and arable fields.
There are no Main Rivers in this ward.
7.6.2 Ordinary watercourses and surface water flood risk
The available data indicates medium/high risk flooding from ordinary
watercourses including the Malpas Brook running down the east edge of the ward,
and a large flood storage area to the south of the ward. There are few residential
properties in this area. In the more urbanised area running through the centre of
the ward from east to west there are properties at medium/high risk of flooding.
Problems may also occur in isolated locations, for example due to culvert
restrictions. As many of the ordinary watercourses are culverted where they pass
through developed areas it is difficult to distinguish between surface water
flooding and flooding from ordinary watercourses.
There are no reported instances of historical flooding from ordinary watercourses
in this ward.
The surface water flood maps show flooding potentially affecting roads and
properties which can be broadly clustered into three main areas running from east
to west across the ward in the area encircled by Monnow Way Road. There are
areas of medium and high risk. The surface water flood maps take a generalised
approach to the representation of drainage systems however the mapping is
indicative of areas most affected during high intensity storms or due to blockages.
Historic flood information details one instance of flooding due to surface water in
Bettws which is detailed in the table below. This reported flood incident relates to
surface water flooding where the drainage systems cannot cope with high
intensity rainfall. The reported flood incidents may also relate to blocked gullies
or drains.
Table 26 – Recorded historic flooding in Bettws
Location of Historic Flooding Reason
Meon Close, Bettws Surface Water Flooding (Flash Flood)
38 Bettws Ward Profile (2014) Newport City Council
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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The table below summarises the impacts of flooding in Bettws based on the
Surface Water Flood map, shown below.
Table 27 – Flood Risk Map counts for Bettws
Totals in
Defined Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100 to
1 in 1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
7793 181 311 1148
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
3359 43 77 312
Essential Services 31 0 0 3
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 30 0 1 23
Primary/Trunk Roads (km) 28.3 2.0 3.9 9.6
Mail Line Railways (km) 0.00 0.00 0.00 0.00
Agricultural Land - Grades 1, 2 and 3 (ha) 513 4 6 11
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI)
(ha) 0.00 0.00 0.00 0.00
Sites of Interest for Nature Conservation
(SINC) (ha) 79.48 13.53 23.69 41.38
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 37.14 0.57 0.76 1.18
Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00
Listed Buildings (n) 7 1 1 2
Essential Settings of Regional Planning
Guidance (ha) 0.00 0.00 0.00 0.00
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Newport City Council Newport Local Flood Risk Management
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7.6.3 Groundwater
There are no recorded groundwater flood incidents.
7.6.4 Sewer Flooding
There are 3 reported instances of DG5 sewer flooding in this ward.
7.6.5 Measures to reduce local flood risk
The main local flood risks are identified as follows:
Monnow Way – a large number of residential properties and some services are
predicted to be at low risk adjacent to the Malpas Brook. There are no reports
of historical flooding in the area predicted and the area is served by an
adjacent ordinary watercourse. Maintenance of the watercourse to maintain
channel capacity and further monitoring is proposed.
Meon Close - To the north of Monnow Way, historic surface water flooding is
recorded, requiring fire service pumping. No surface water flooding is
predicted and further investigation is proposed.
Bettws Lane (adjacent to High School) – downstream of Monnow Way the
highway gullies are prone to blockage from leaf debris causing surface water
ponding. A high risk of surface water flooding is predicted. Regular
monitoring and gully clearance is planned.
Adjacent to Bettws Lane there are flood water storage lagoons where flood
water is designed to attenuate during times of high flow, with the pass forward
capacity controlled by a flood gate. NCC operate and maintain the structure.
Further investigation into the control requirements is needed, and maintenance
of a flood containment wall is planned. The structure will be evaluated as to
whether it requires formal designation as a reservoir.
Tone Close – a large number of residential properties and some services are
predicted to be at low risk. There are no reports of historical flooding in the
area. At the head of the topographic depression, the ordinary watercourse is
culverted to the northeast. Further investigation of the inlet arrangement at
Waveney Close is proposed.
Parc-y-Brain Road – Surface runoff from adjacent land had been prone to
causing highway flooding. The fire service was required to evacuate
occupants of a stranded car. Improvement works by NCC including culvert
upsizing and new highway gullies were completed in 2013. Their
effectiveness will be monitored.
Darent Road – Downstream of Parc-y-Brain Road, a large number of
residential properties are predicted to be at high risk of surface water flooding,
with the Bettws Brook running over Ogmore Crescent. The Ogmore Crescent,
Bettws culvert inlet grid has been identified as ‘critical’ by NCC. There are no
reports of historical flooding in the area. Further monitoring is proposed.
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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The following measures are identified to reduce flood risk.
Table 28 – Local Flood Risk Management measures for Bettws.
Location
and
Description
Measure Timescale Indicative
Cost
Strategic
Context
D1 Monnow
Way
Enhanced watercourse
maintenance.
Ongoing N/A
(Revenue)
M35
D2 Monitor Ongoing N/A
(Revenue)
M53,
M44
D3 Meon Close Investigate surface water
flood risk.
Medium
term (5-10
years)
3days FTE
M24
D4 Monitor Ongoing N/A
(Revenue)
M53,
M44
D5 Bettws Lane Investigate downstream
flood attenuation structure.
Short term
(0-5 years)
5 days FTE
plus £10k
survey
M24
D6 Nominal allowance for
repairs of downstream
attenuation structure
Short term
(0-5 years)
£50k-£200k
nominal
estimate
M33
D7 Enhanced highway drainage
maintenance.
Ongoing N/A
(Revenue)
M35
D8 Monitor Ongoing N/A
(Revenue)
M53,
M44
D9 Tone Close Investigate inlet
arrangement at Waveney
Close
Medium
term (5-10
years)
2days FTE
plus £2k
survey
M24
D10 Monitor Ongoing N/A
(Revenue)
M53,
M44
D11 Parc-y-Brain
Road
Monitor Ongoing N/A
(Revenue)
M53,
M44
D12 Darent Road Monitor Ongoing N/A
(Revenue)
M53,
M44
D13 Bettws Ward Investigate and promote
application of Glastir
Advanced given potential
suitability for land
management practices to
reduce flood risk and protect
water supplies
Short term
(0-5 years)
10days FTE M31
Total (non-revenue) 21days FTE and £71-
212k
Recovery and review Preventing
6 3
6 4
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
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7.7 Caerleon Ward
7.7.1 Overview
Caerleon Ward is situated along the northern border of NCC, to the north-east of
Central Newport. The suburban village has a population of approximately 7,97934
and an area of 14.53km2, which is approximately 5.4% of the total area of
Newport39. The ward consists of two significant hills, to the west and east, which
steeply slope down to the valley floor in the centre of Caerleon which comprises
residential and commercial buildings. The River Usk and Afon Lwyd flow
through the centre of the ward to their confluence west of the Celtic Manor.
7.7.2 Ordinary watercourses and surface water flood risk
The available data indicates some areas of medium/high risk flooding from
ordinary watercourses in the north of the ward and a patch of low risk in the
south. Although there are few residential properties in these areas there is a risk
that Ponthir Road could be affected. Problems may also occur in isolated
locations, for example due to culvert restrictions. As many of the ordinary
watercourses are culverted where they pass through developed areas it is difficult
to distinguish between surface water flooding and flooding from ordinary
watercourses.
There are two reported historical flooding incidents from ordinary watercourses.
Table 29 – Recorded historic ordinary watercourse flooding in Caerleon
Location of Historic Flooding Reason
St Cadoc's Close Surface water flooding, from natural exceedence
of ordinary watercourse
Bellin Close Surface water flooding, from natural exceedence
of ordinary watercourse
The surface water flood maps show flooding potentially affecting roads and
properties which can be broadly clustered into three main areas towards the centre
of the ward to the west of the river Usk. They are generally areas of low risk but
with small spots of medium and high risk. The surface water flood maps take a
generalised approach to the representation of drainage systems however the
mapping is indicative of areas most affected during high intensity storms or due to
blockages.
There are two recorded instances of surface water flooding in Caerleon, detailed
in the table below. This reported flood incident relates to surface water flooding
where the drainage systems cannot cope with high intensity rainfall. The reported
flood incidents may also relate to blocked gullies or drains.
Table 30 – Recorded historic surface water flooding in Caerleon
Location of Historic Flooding Reason
Ashwell Cottages, Caerleon Surface Water Flooding (Flash Flood)
Roman Way Surface water flooding
39 Caerleon Ward Profile (2014) Newport city council
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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The table below summarises the impacts of flooding in Caerleon based on the
Surface Water Flood map, shown below.
Table 31 - Flood Risk Map counts for Caerleon
Totals in
Defined Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100
to 1 in
1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
8248 19 84 654
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
3555 4 11 91
Essential Services 67 0 0 1
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 154 1 5 21
Primary/Trunk Roads (km) 69.3 1.5 3.9 12.0
Mail Line Railways (km) 3.70 0.14 0.45 1.12
Agricultural Land - Grades 1, 2 and 3 (ha) 1394 2 3 7
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 62.94 0.00 0.01 0.06
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI)
(ha) 63.93 0.00 0.01 0.06
Sites of Interest for Nature Conservation
(SINC) (ha) 166.02 6.22 8.26 17.79
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 47.99 0.40 0.50 0.96
Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 70.68 0.33 0.76 3.13
Listed Buildings (n) 82 0 0 1
Essential Settings of Regional Planning
Guidance (ha) 50.85 0.72 1.46 5.24
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Newport City Council Newport Local Flood Risk Management
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7.7.3 Groundwater
There are no recorded groundwater flood incidents.
7.7.4 Sewer Flooding
There are 28 reported instances of DG5 sewer flooding in this ward.
7.7.5 Measures to reduce local flood risk
The main local flood risks are identified as follows:
Isca Road – Highway ponding is recorded where discharge from gullies is
restricted or locked during periods of high tide. NRW are proposing a tidal
flood risk scheme in the area and continued partnership working between
NRW and NCC is proposed to address residual surface water flood risk is
proposed.
Roman Way – Several culvert inlet grids are located in this area and have been
prone to blockage. The Fire Service have recorded two incidents. NCC
records surface water flooding in St Cadoc’s Close and Roman Way. A large
number of properties are predicted at low/medium risk of flooding.
Downstream services risk include the college and access route to the hospital,
where Fire Service pumping has been recorded. Sewer flooding incidents are
recorded. The culvert inlet screen adjacent to Gwladys Place has blockage
issues and the St Cadoc’s Close inlet grid is identified by NCC as ‘critical’.
Downstream there is open space which could be used as part of improvements
to the existing drainage. Further investigation and monitoring is planned,
including liaison with DCWW and investigation of the inlet grid arrangement.
Roman Road – A large number of properties are predicted at low/medium risk
of flooding. Whilst no surface water flooding incidents are recorded, some
property sewer flooding incidents are recorded. The area is drained by Home
Farm culvert to the adjacent River Usk. The surface water maps demonstrate
the risk should the culvert block. Inspection and maintenance of the tidal flap,
culvert inlet and liaison with DCWW is planned.
Castle Street / High Street / Castle Close / Tram Road – Small numbers of
properties and services are predicted at low/medium risk throughout the area.
No surface water flooding is recorded however property sewer flooding
incidents are recorded and the Fire Service has attended to pump flooding of
the highway. Monitoring and liaison with DCWW is planned.
Ponthir Road / Malthouse Road – A small number of properties and the
highway are predicted at high risk. The watercourse runs under the road
through a culvert. Maintenance and monitoring is planned.
Bellin Close / Brooklea / Forge Close – A small number of properties are
predicted at medium/low risk. Surface water flooding has been recorded at
Bellin Close. The culvert inlet is located in a wooded area and is prone to
blockages. The adjacent College ground may provide open space for
mitigation measures such as additional conveyance options. NCC developed
Newport City Council Newport Local Flood Risk Management
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an outline downstream culvert enhancement proposal which was unable to
progress due to lack of funding. Further investigation and monitoring is
planned.
The following measures are identified to reduce flood risk.
Table 32 - Local Flood Risk Management measures for Caerleon
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
E1 Isca Road Partnership working with
NRW to reduce residual
surface water risk.
Ongoing N/A
(Revenue)
M35
E2 Monitor Ongoing N/A
(Revenue)
M53,
M44
E3 Roman Way Investigate culvert inlet
screening arrangement
and liaison with DCWW
on surface water sewer
disconnection
opportunities.
Short term
(0-5 years)
5days FTE
plus £5k
surveys
M24,
M34
E4 Monitor Ongoing N/A
(Revenue)
M53,
M44
E5 Roman Road Investigate culvert inlet
and maintain tidal flap.
Liaison with DCWW on
surface water
disconnection
opportunities
Short term
(0-5 years)
5days FTE
plus £5k
surveys
M24,
M35,
M34
E6 Monitor Ongoing N/A
(Revenue)
M53,
M44
E7 Castle Street /
High Street /
Castle Close /
Tram Road
Liaison with DCWW on
surface water
disconnection
opportunities
Short term
(0-5 years)
5days FTE
plus £5k
surveys
M24,
M35
E8 Monitor Ongoing N/A
(Revenue)
M53,
M44
E9 Ponthir Road /
Malthouse Road
Culvert maintenance Ongoing N/A
(Revenue)
M35
E10 Monitor Ongoing N/A
(Revenue)
M53,
M44
E11 Bellin Close /
Brooklea / Forge
Close
Investigate culvert inlet
arrangement, and
justification for
downstream culvert
enhancement scheme.
Short term
(0-5 years)
15days FTE
plus £5k
surveys
M24,
M35,
M34
E12 Culvert scheme Mid-term
(5-10
years)
£50k-£150k
nominal
estimate
M35
E13 Monitor Ongoing N/A
(Revenue)
M53,
M44
Total (non-revenue) 25days FTE and £70-
170k
Recovery and review Preventing
6 4
6 9
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
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7.8 Gaer Ward
7.8.1 Overview
Gaer Ward is situated in the central part of NCC, to the south-west of Central
Newport. It has a population of approximately 8,67234 and an area of 2.8km2,
which is approximately 1.3% of the total area of Newport40. The ward gently
slopes north to south, with residential housing concentrated to the east of the
ward. The hillside catchment is drained by the Ebbw River which flows around
hillside to the west of the ward.
7.8.2 Ordinary watercourses and surface water flood risk
The available data indicates low risk of flooding from ordinary watercourses,
however problems could occur in isolated locations, for example due to culvert
restrictions. As many of the ordinary watercourses are culverted where they pass
through developed areas it is difficult to distinguish between surface water
flooding and flooding from ordinary watercourses.
There no reported instances of historical flooding from ordinary watercourses in
this ward.
The surface water flood maps show medium/high risk of flooding potentially
affecting roads and properties which can be broadly clustered into two main areas;
in the vicinity of Harlech Retail Park in the centre of the ward and near Docks
Way in the south west of the ward. The surface water flood maps take a
generalised approach to the representation of drainage systems however the
mapping is indicative of areas most affected during high intensity storms or due to
blockages.
There are no reported instances of historical flooding from surface water in this
ward.
The table below summarises the impacts of flooding in Gaer based on the Surface Water
Flood map, shown below.
40 Gaer Ward Profile (2014) Newport city council
Newport City Council Newport Local Flood Risk Management
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Table 33 - Flood Risk Map counts for Gaer
Totals in
Defined Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100 to
1 in 1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
9185 9 51 459
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
3959 0 7 98
Essential Services 36 0 0 4
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 50 1 4 17
Primary/Trunk Roads (km) 37.5 1.6 4.2 12.3
Mail Line Railways (km) 3.47 0.03 0.20 0.64
Agricultural Land - Grades 1, 2 and 3 (ha) 281 0 0 0
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (ha) 0.00 0.00 0.00 0.00
Sites of Interest for Nature Conservation(ha) 43.25 3.15 3.88 5.08
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 0.00 0.00 0.00 0.00
Registered Parks and Gardens (ha) 72.39 2.62 3.64 7.75
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 9.50 0.00 0.01 0.09
Listed Buildings (n) 4 0 0 0
Essential Settings of Regional Planning
Guidance (ha) 0.25 0.00 0.00 0.00
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
Newport City Council Newport Local Flood Risk Management
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Newport City Council Newport Local Flood Risk Management
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7.8.3 Groundwater
There are no recorded groundwater flood incidents.
7.8.4 Sewer Flooding
There are 8 reported instances of DG5 sewer flooding in this ward.
7.8.5 Measures to reduce local flood risk
The main flood risks are identified as follows:
Cardiff Road / Harlech Road – A small number of properties and the B4237
are predicted at low/medium risk of flooding. The Fire Service have recorded
an incident of highway flooding to the north. To the south sewer flooding
incidents are recorded. Monitoring and investigation into the condition and
maintenance of the culvert under the railway which discharges into the Cefn
Adda Reen is proposed, along with liaison with DCWW.
St Brides Crescent - A large number of properties are predicted at low risk of
flooding. No surface water flooding incidents are recorded. The area is served
by a storm water pumping station, investigation into its maintenance and
monitoring is planned.
St Davids Crescent – A small number of properties are predicted at low risk of
flooding. The Fire Service have recorded an incident of property flooding.
Monitoring is proposed.
Gaer Road / Dickens Drive – The highway is predicted at medium risk of
flooding and the Fire Service have recorded an incident of highway flooding.
Monitoring and a review of highway drainage maintenance is proposed.
Gaer Ponds / Shakespeare Crescent – Flooding of the highway has been
experienced. NCC have identified Gaer Ponds gully inlet as ‘critical’.
Significant maintenance on the ponds was completed in 2014. Investigation
and maintenance of the overflow culvert running under the railway is
proposed, with monitoring.
Docks Way / Maesglas Close – A small number of properties and the highway
(A48) are predicted at low/medium risk of surface water flooding. Occasional
highway surface water flooding is recorded. Anecdotal comments suggest that
issues with the operation of the storm water pumping station may be a
contributory factor. NCC storm pumping station is identified as ‘high risk’ and
so has telemetry installed. Further investigation into the pumping station and
monitoring is planned.
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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The following measures are identified to reduce flood risk.
Table 34 – Local Flood Risk Management measures identified for Gaer
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
F1 Cardiff Road /
Harlech Road
Investigate culvert
maintenance/condition
under railway.
Short term
(0-5 years)
3days FTE
plus £5k
survey
M24,
M34
F2 Liaison with DCWW on
surface water sewer
disconnection opportunities.
Short term
(0-5 years)
5days FTE
M24,
M34
F3 Monitor Ongoing N/A
(Revenue)
M53,
M44
F4 St Brides
Crescent
Investigate storm water
pumping station
maintenance.
Short term
(0-5 years)
3days FTE M24,
M34
F5 Monitor Ongoing N/A
(Revenue)
M53,
M44
F6 St Davids
Crescent
Monitor Ongoing N/A
(Revenue)
M53,
M44
F7 Gaer Road /
Dickens Drive
Review and enhancement of
highway drainage
maintenance.
Short term
(0-5 years)
3days FTE M35
F8 Monitor Ongoing N/A
(Revenue)
M53,
M44
F9 Gaer Ponds /
Shakespeare
Crescent
Investigation and
maintenance of overflow
culvert.
Short term
(0-5 years)
3 days FTE
and £3k
survey
M35
F10 Routine pond maintenance Ongoing £15-25k
(nominal
estimate)
M35
F11 Monitor Ongoing N/A
(Revenue)
M53,
M44
F12 Maerglas
Close / Docks
Road
Investigate storm water
pumping station
maintenance.
Short term
(0-5 years)
3days FTE M24,
M34
F13 Monitor Ongoing N/A
(Revenue)
M53,
M44
Total (non-revenue) 20days FTE and £20-
33k
Recovery and review Preventing
6 4
6 7
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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7.9 Graig Ward
7.9.1 Overview
Graig Ward is situated along the northern and western border of NCC, located to
the west of Central Newport. It has a population of 6,11634 and an area of
14.34km2, which is approximately 6.6% of the total area of Newport41. The ward
consists of a hill peak to the north, which steeply slopes down to the valley floor,
west to east. There is limited development within this ward, mainly consisting of
arable and livestock fields, however there is some housing concentrated to the east
of the ward.
The Main River Ebbw runs down the east boundary of this ward and the river
Rhymney runs down the western boundary.
7.9.2 Ordinary watercourses and surface water flood risk
The available data indicates some isolated patches of medium/high risk flooding
from ordinary watercourses in the central and south east of the ward. Problems
may also occur in isolated locations, for example due to culvert restrictions. As
many of the ordinary watercourses are culverted where they pass through
developed areas it is difficult to distinguish between surface water flooding and
flooding from ordinary watercourses.
There are two reported instances of historical flooding from ordinary watercourses
in Graig which are detailed in the table below:
Location of Historic Flooding Reason
Springfield, Rhiwderin Surface water flooding caused by blocked trash
screen and collapsed pipe
Ffos-y-Fran, Bassaleg Surface water flooding from an ordinary
watercourse, natural exceedence flood event
The surface water flood maps show flooding potentially affecting roads and
properties which can be broadly clustered into two main areas particularly around
the south east area of the ward by Rhiwderin and Bassaleg. They are generally
areas of low risk but with small spots of medium and high risk. The surface water
flood maps take a generalised approach to the representation of drainage systems
however the mapping is indicative of areas most affected during high intensity
storms or due to blockages.
Historic flood information details one instance of flooding due to surface water in
Graig which is detailed in the table below. This reported flood incident relates to
surface water flooding where the drainage systems cannot cope with high
intensity rainfall. The reported flood incidents may also relate to blocked gullies
or drains.
Location of Historic Flooding Reason
Church Crescent, Bassaleg Surface Water Flooding (Flash Flood)
41 Graig Ward Profile (2014) Newport city council
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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The table below summarises the impacts of flooding in Graig based on the
Surface Water Flood map, shown below.
Table 35 - Flood Risk Map counts for Graig
Totals in
Defined Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100
to 1 in
1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
5765 53 102 371
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
2485 12 21 66
Essential Services 25 0 0 1
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 33 2 4 14
Primary/Trunk Roads (km) 54.3 4.2 7.9 17.1
Mail Line Railways (km) 6.81 0.81 1.20 1.70
Agricultural Land - Grades 1, 2 and 3 (ha) 1434 18 29 74
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI)
(ha) 3.76 0.00 0.03 0.30
Sites of Interest for Nature Conservation
(SINC) (ha) 149.44 5.85 7.76 11.98
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 212.00 1.19 1.79 4.25
Registered Parks and Gardens (ha) 7.93 0.17 0.31 0.83
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 2.32 0.00 0.01 0.02
Listed Buildings (n) 38 5 5 6
Essential Settings of Regional Planning
Guidance (ha) 36.56 0.39 1.00 2.95
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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7.9.3 Groundwater
There are no recorded groundwater flood incidents.
7.9.4 Sewer Flooding
There are 5 reported instances of DG5 sewer flooding in this ward.
7.9.5 Measures to reduce local flood risk
The main local flood risks are identified as follows:
Park View / Pye Corner – Located on the boundary with Rogerstone, the
highway is predicted to have a high risk of flooding at the railway underpass.
Recurring surface water flooding is recorded, affecting residential gardens.
Anecdotal comments that debris blockages of the ordinary watercourse has
been a contributory factor; further investigation and liaison with riparian
owners is planned. There are also property sewer flooding incidents from the
combined network, and liaison with DCWW is also proposed.
Rhiwderin – A small number of properties, services and the highway are
predicted at high risk of flooding. Affected properties include Springfield
Lane/Road, Caernarvon Road and Oaklands Park Drive. An historic surface
water flooding incident is recorded and the Fire Service have recorded an
incident of property flooding. The area is served by two culverted ordinary
watercourses. Monitoring and further investigation into the arrangement of the
inlet grids is planned. Some property sewer flooding is recorded and liaison
with DCWW is also proposed as there are anecdotal comments of issues
arising from the interaction between the storm and foul network. There may
be opportunities to attenuate flows upstream.
Bassaleg – A number of properties and services are predicted at high/medium
risk of surface water flooding. Affected property locations include Farriers
Gate, Churchmead, and upstream at Ffos-y-Fran/Caerphilly Road where a
surface water flooding incident is recorded in the PFRA. A partially culverted
ordinary watercourse runs through the affected area. Anecdotal comments are
that mud on the public highway from farm vehicles makes highway drainage
prone to blockage. NCC have recently worked with a riparian owner adjacent
to Penylan Road to divert highway flooding into an adjacent ditch. Monitoring
and investigation into the arrangement, condition, capacity and maintenance
responsibilities of the culverts under the A467 and A468 is planned. There
may be opportunities to attenuate flows upstream or improvements to the
culvert. Some sewer flooding incidents are also recorded of the combined
network, and liaison with DCWW is also proposed.
Forge Lane – A number of properties are predicted at high risk of surface
water flooding. The Forge Lane, Rogerstone culvert inlet screen is considered
‘critical’ by NCC. There may be opportunities to attenuate flows upstream or
improvements to the culvert. Further investigation and monitoring is planned.
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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The following measures are identified to reduce flood risk.
Table 36 – Local flood risk management measures for Graig
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
G1 Park View /
Pye Corner
Further investigation and
liaison with riparian
owners.
Short term
(0-5 years)
3days FTE M24, M43
G2 Liaison with DCWW on
surface water sewer
disconnection
opportunities.
Short term
(0-5 years)
4days FTE
M24, M34
G3 Monitor Ongoing N/A
(Revenue)
M53, M44
G4 Rhiwderin Further investigation into
culvert arrangement and
inlet grids
Short term
(0-5 years)
4days FTE
plus £2k
survey
M24, M35
G5 Liaison with DCWW on
sewer improvement
opportunities.
Short term
(0-5 years)
4days FTE
M24, M34
G6 Monitor Ongoing N/A
(Revenue)
M53, M44
G7 Bassaleg Investigation into the
arrangement, condition,
capacity and maintenance
responsibilities of the
culverts.
Short term
(0-5 years)
4days FTE
plus £2k
survey
M24
G8 Liaison with DCWW on
surface water sewer
disconnection
opportunities.
Short term
(0-5 years)
4days FTE
M24, M34
G9 Monitor Ongoing N/A
(Revenue)
M53, M44
G10 Forge Lane Further investigation into
culvert arrangement and
inlet grids
Short term
(0-5 years)
3days FTE
plus £2k
survey
M24, M35
G11 Monitor Ongoing N/A
(Revenue)
M53, M44
Total (non-revenue) 25days FTE and £6k
Recovery and review Preventing
3 6
4 4
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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7.10 Langstone Ward
7.10.1 Overview
Langstone Ward is situated along the northern and eastern border of NCC, located
to the north-east of Central Newport. It has a population of 4,36634 and an area of
30.43km2, which is approximately 14.02% of the total area of Newport42. A
hillslope ridge dominates the north of the ward, steeply sloping south to a valley
containing residential properties.
There is a short length of Main River in this ward.
7.10.2 Ordinary watercourses and surface water flood risk
The available data indicates some isolated patches of medium/high risk flooding
from ordinary watercourses in south of the ward. Problems may also occur in
isolated locations, for example due to culvert restrictions. As many of the ordinary
watercourses are culverted where they pass through developed areas it is difficult
to distinguish between surface water flooding and flooding from ordinary
watercourses.
There is one reported instance of historical flooding from ordinary watercourses
in Langstone which is detailed in the table below:
Location of Historic Flooding Reason
Ford Farm Lane Ordinary watercourses, properties flooded at
Forge Farm Lane due to a blocked trash screen
The surface water flood maps show two clusters of issues around Langstone and
Llanmartin. They are generally areas of low risk but with small spots of medium
and high risk. The surface water flood maps take a generalised approach to the
representation of drainage systems however the mapping is indicative of areas
most affected during high intensity storms or due to blockages.
Historic flood information details two instances of flooding due to surface water
in Langstone which are detailed in the table below. This reported flood incident
relates to surface water flooding where the drainage systems cannot cope with
high intensity rainfall. The reported flood incidents may also relate to blocked
gullies or drains.
Location of Historic Flooding Reason
A48 Chepstow Rd, Langstone Surface Water Flooding/culvert flooding
Magor Road, nr j/w Waltwood
Rd
Surface Water Flooding/culvert flooding
42 Langstone Ward Profile (2014) Newport city council
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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The table below summarises the impacts of flooding in Langstone based on the
Surface Water Flood map, shown below.
Table 37 – Flood Risk Map counts for Langstone.
Totals in
Defined
Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100 to
1 in 1000
chance in
any year)
Estimated residents in areas at risk of flooding
depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
4081 23 58 258
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
1759 6 9 38
Essential Services 59 0 0 2
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 50 5 7 24
Primary/Trunk Roads (km) 114.5 3.0 5.8 15.8
Mail Line Railways (km) 0.00 0.00 0.00 0.00
Agricultural Land - Grades 1, 2 and 3 (ha) 3035 10 19 58
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 15.44 0.00 0.01 0.07
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI) (ha) 72.09 0.74 1.47 4.79
Sites of Interest for Nature Conservation
(SINC) (ha) 641.88 1.51 3.23 7.88
National Nature Reserves (NNR) (ha) 23.98 0.00 0.01 0.04
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 502.93 0.70 1.88 4.00
Registered Parks and Gardens (ha) 3.52 0.09 0.10 0.11
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 17.49 0.36 0.77 2.40
Listed Buildings (n) 32 0 0 1
Essential Settings of Regional Planning
Guidance (ha) 42.65 2.22 3.92 7.93
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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7.10.3 Groundwater
There are no recorded groundwater flood incidents.
7.10.4 Sewer Flooding
There are 6 reported instances of DG5 sewer flooding in this ward.
7.10.5 Measures to reduce local flood risk
The main flood risks are identified as follows:
Magor Road / Ford Farm Lane / Carpenter Close / Miller Close – A
number of properties and highways are predicted at high/medium risk of
surface water flooding. The Fire Service record an incident of external
flooding. An earlier historic flooding incident is attributed to a blocked
debris inlet screen and liaison with riparian owners regarding woodland
management and blockage risk is planned, in addition to a review of the
inlet arrangement and monitoring. Anecdotal comments also highlight
concerns over downstream culvert capacity throttling flows; further
investigation is proposed, with an allowance for works to upsize the
culvert.
Chepstow Road, Langstone - Immediately upstream of the above issue, a
small number of properties, the highway (A48) and a service are predicted
at risk of flooding. Recurrent surface water flooding of the road is
recorded. The Fire Service record an incident of pumping flood water to
clear the highway. Investigation into the upstream culvert inlet
arrangement is proposed, with monitoring.
Magor Road, Llanmartin – Waltwood Road is predicted at high risk of
surface water flooding. Recurring surface water of the road is recorded.
Recent works to improve highway drainage have been completed,
including new gully connections. NCC identify the A48 Langstone inlet
grid to be ‘critical’. The network discharges into a downstream
watercourse and anecdotal comments are that this throttles the network
due to lack of maintenance. Liaison with the riparian owner is planned,
with monitoring. Anecdotal comments note problems with culvert inlet
grid and further investigation, ongoing maintenance and monitoring is
planned.
Blossom Close / Priory Grove / Court Meadow – A number of clusters of
properties and the highway are predicted at high/medium risk of surface
water flooding. Whilst no historic surface water incidents are recorded by
NCC, the Fire Service record a number of incidents of flooding of
property. Anecdotal comments note problems with culvert inlet grid and
further investigation, ongoing maintenance and monitoring is planned.
Attenuation storage upstream of Priory Farm may be an option to hold
back peak flows.
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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Penhow, St Brides Brook – The A48 highway is predicted at high risk of
surface water flooding and the Fire Service record two incidents of
pumping flood water to clear the highway. NCC identify the A48 Penhow
inlet grid to be ‘critical’. Anecdotal comments are that land drainage
contributes to highway drainage issues and property flooding is
experienced, and this is exacerbated by throttling due to restrictions
downstream. The drainage network is complex and further investigation
and monitoring is proposed.
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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The following measures are identified to reduce flood risk.
Table 38 – Local flood risk management measures for Langstone.
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
H1 Magor Road / Ford
Farm Lane /
Carpenter Close /
Miller Close
Liaison with riparian
owners regarding
woodland
management.
Short term
(0-5 years)
1day FTE
M24, M43
H2 Investigation into
culvert capacity,
arrangement and inlet
grids
Short term
(0-5 years)
3days FTE
plus £2k
survey
M24,
M35, M44
H3 Works to increase
culvert capacity
Short term
(0-5 years)
£20-80k
(nominal
estimate)
M33, M34
H4 Monitor Ongoing N/A
(Revenue)
M53, M44
H5 Chepstow Road,
Langstone
Further investigation
into upstream culvert
arrangement and inlet
grids
Short term
(0-5 years)
3days FTE
M24, M35
H6 Monitor Ongoing N/A
(Revenue)
M53, M44
H7 Magor Road,
Llanmartin
Liaison with riparian
owners.
Short term
(0-5 years)
1day FTE M24, M43
H8 Investigation into
culvert capacity,
arrangement and inlet
grids
Short term
(0-5 years)
N/A
M53, M44
H9 Works to increase
culvert capacity
Short term
(0-5 years)
£20-80k
(nominal
estimate)
M33, M34
H10 Monitor Ongoing N/A
(Revenue)
M53, M44
H11 Blossom Close /
Priory Grove /
Court Meadow
Investigation into
culvert inlet grid
arrangement and
maintenance
Short term
(0-5 years)
4days FTE
plus £5k
survey
M24, M35
H12 Works to inlets
culvert grid
Short term
(0-5 years)
£10-40k
(nominal
estimate)
M33, M34
H13 Monitor Ongoing N/A
(Revenue)
M53, M44
H14 Penhow, St Brides
Brook
Further investigation
into drainage
arrangement.
Short term
(0-5 years)
3days FTE
plus £3k
survey
M24
H15 Monitor Ongoing N/A
(Revenue)
M53, M44
Total (non-revenue) 15days FTE & £60-210k
Recovery and review Preventing
6 6
9 9
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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7.11 Liswerry Ward
7.11.1 Overview
Liswerry Ward is stretches along the coast of NCC up to the southern edge of
Central Newport. It has a population of 12,69434 and an area of 18.59km2, which
is approximately 8.6% of the total area of Newport43. The ward is mainly flat,
with limited variations in elevation, and mainly consists of industrial, residential
and commercial developments. A large proportion of the wards in the south is
rural. The Main Rivers consist of the Usk which runs down the east boundary of
the ward and Liswerry Pill Reen and Great Spytty Reen which run east to west
across the north of the ward. Some of the ward falls within the Caldicot Level
drainage district.
7.11.2 Ordinary watercourses and surface water flood risk
The available data indicates some isolated patches of low risk flooding from
ordinary watercourses. Problems may occur in isolated locations, for example due
to culvert restrictions. As many of the ordinary watercourses are culverted where
they pass through developed areas it is difficult to distinguish between surface
water flooding and flooding from ordinary watercourses.
There are no reported instances of historical flooding from ordinary watercourses
in Liswerry.
The surface water flood maps show no significant clusters of issues within
Liswerry. The area is generally low risk with some properties in the north of the
ward being at low risk of flooding. The surface water flood maps take a
generalised approach to the representation of drainage systems however the
mapping is indicative of areas most affected during high intensity storms or due to
blockages.
A number of surface water pumping stations operate to reduce the risk of surface
water flooding, and flooding due to tide-lock.
Historic flood information details instances of flooding due to surface water in
Liswerry which are detailed in the table below. There are also anecdotal reports of
surface water flooding in November 2011 to Rodney Parade and across the
Maindee area.This reported flood incident relates to surface water flooding where
the drainage systems cannot cope with high intensity rainfall. The reported flood
incidents may also relate to blocked gullies or drains.
Location of Historic Flooding Reason
Stephenson Street Highway drainage and combined sewer issue.
The table below summarises the impacts of flooding in Liswerry based on the
Surface Water Flood map, shown below.
43 Liswerry Ward Profile (2014) Newport city council
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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Table 39 – Flood Risk Map counts for Liswerry
Totals in
Defined Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100 to
1 in 1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
11830 0 14 833
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
5099 0 0 196
Essential Services 168 0 0 4
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 385 5 11 56
Primary/Trunk Roads (km) 80.8 0.8 3.9 22.1
Mail Line Railways (km) 7.10 0.03 0.05 0.11
Agricultural Land - Grades 1, 2 and 3 (ha) 1514 0 2 18
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 128.29 0.00 0.00 0.02
Special Protection Areas (SPA) (ha) 34.95 0.00 0.00 0.02
Ramsar Sites (ha) 34.95 0.00 0.00 0.02
Sites of Special Scientific Interest (SSSI)
(ha) 706.70 0.00 0.12 8.70
Sites of Interest for Nature Conservation
(SINC) (ha) 328.58 0.00 0.16 4.98
National Nature Reserves (NNR) (ha) 220.04 0.00 0.00 1.31
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 0.00 0.00 0.00 0.00
Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00
Listed Buildings (n) 8 0 0 0
Essential Settings of Regional Planning
Guidance (ha) 0.00 0.00 0.00 0.00
RSPB Bird Reserves (ha) 6.41 0.00 0.00 0.06
Newport City Council Newport Local Flood Risk Management
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Newport City Council Newport Local Flood Risk Management
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7.11.3 Groundwater
There are no recorded groundwater flood incidents.
7.11.4 Sewer Flooding
There are 12 reported instances of DG5 sewer flooding in this ward.
7.11.5 Measures to reduce local flood risk
The main flood risks are identified as follows:
Stephenson Street – A high risk of surface water flooding is predicted with the
resultant ponding impacting on the highway, which provides the sole access to
an industrial estate. NCC records suggest that this is a recurring issue, with
anecdotal comments that the highway drainage discharges to the sewer
network which is prone to blockage due to the relatively shallow gradient.
Further investigation and monitoring is planned, with DCWW liaison into
sewer surface water disconnection options.
Corporation Road / Southern Distributor Road – There is a high risk of surface
water flooding of the highway (A48), ponding under the railway bridge. The
culverted Great Spytty Reen drains through the area and anecdotal comments
suggest localised flooding occurs approximately annually. The Reen is prone
to tide-lock and liaison with NRW is proposed, with ongoing monitoring.
Walsall Street / Dudley Street – There are a large number of properties with a
low risk of surface water flooding in the area. The area is at a lower level than
the adjacent Willenhall Street. This is a residual risk, with the dominant flood
risk being tidal flooding from the adjacent Main River. The area is relatively
flat and understood to be drained by the combined sewer network and
opportunities for surface water attenuation storage to hold back peak flows
should be investigated. No flooding incidents have been recorded. Liaison
with DCWW with ongoing monitoring is planned.
Corporation Street / Colston Avenue – The highway is predicted at low risk of
surface water flooding. Anecdotal comments suggest flooding has been
experienced following issues with the adjacent pumping station and screening
however the asset has been subsequently refurbished. Investigation into the
ownership and maintenance is planned, with ongoing monitoring.
Stephenson Street Industrial Estate – Whilst no significant surface water
flooding is predicted, the area drains into surface water storage ponds before
discharging to the River Usk. Investigation into the ownership and
maintenance of these structures is planned.
Thompson Avenue – There is a high risk of highway flooding predicted. The
area is served by a culvert, draining to the Liswerry Pill Reen and no historic
flooding is recorded. Investigation and monitoring of this culvert is proposed,
since it also serves a largely residential area of the adjacent Alway Ward to the
north. Maintenance of the culvert under the rear gardens of properties is
challenging. Investigation into ownership and inlet arrangement is planned.
Newport City Council Newport Local Flood Risk Management
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Traston Avenue – Whilst there is no predicted surface water flood risk,
anecdotal comments suggest the area may be prone to elevated groundwater
causing nuisance of saturated gardens. Investigation into the maintenance of
the adjacent watercourses is planned, noting that the area is prone to tidal lock
from the Great Spytty Reen. Liaison with NRW is also planned.
The following measures are identified to reduce flood risk.
Table 40 – Local Flood Risk Management measures for Liswerry
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
I1 Stephenson
Street
Investigation into highway
drainage
Short term
(0-5 years)
3days FTE
plus £2k
survey
M24,
M35
I2 Liaison with DCWW on
surface water disconnection.
Short term
(0-5 years)
5days FTE
M24,
M34
I3 Nominal improvement
works to highway drainage
Short term
(0-5 years)
£10-20k
(nominal
estimate)
M33,
M34
I4 Monitor Ongoing N/A
(Revenue)
M53,
M44
I5 Corporation
Road /
Southern
Distributor
Road
Partnership working with
NRW wrt Reen
Ongoing N/A
(Revenue)
M35
I6 Monitor Ongoing N/A
(Revenue)
M53,
M44
I7 Walsall Street /
Dudley Street
Liaison with DCWW on
surface water disconnection.
Short term
(0-5 years)
5days FTE
M24,
M34
I8 Monitor Ongoing N/A
(Revenue)
M53,
M44
I9 Corporation
Street / Colston
Avenue
Investigate ownership/
maintenance of drainage
assets
Short term
(0-5 years)
1day FTE M33,
M34
I10 Monitor Ongoing N/A
(Revenue)
M53,
M44
I11 Stevenson
Street
Industrial
Estate
Investigate ownership/
maintenance of drainage
assets
Short term
(0-5 years)
1day FTE M33,
M34
I12 Thompson
Avenue
Investigation into culvert
ownership/maintenance, and
inlet arrangement.
Short term
(0-5 years)
5days FTE
plus £2k
survey
M24,
M35
I13 Monitor Ongoing N/A
(Revenue)
M53,
M44
I14 Traston
Avenue
Partnership working with
NRW wrt Reen
Ongoing N/A
(Revenue)
M35
I15 Investigation into
watercourse maintenance.
Short term
(0-5 years)
3days FTE M24,
M35
I16 Monitor Ongoing N/A
(Revenue)
M53,
M44
Total (non-revenue) 23days FTE and £14-
24k
Recovery and review Preventing
6 3
6 11
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
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7.12 Llanwern Ward
7.12.1 Overview
Llanwern Ward is the largest ward and is situated along the southwest coast of
NCC. It has a population of 2,95234 and an area of 52.83km2, which is
approximately 24% of the total area of Newport44. Llanwern is mainly flat, apart
from a rise in elevation along the northern ward boundary. The land use within the
ward consists of a large industrial development, and arable and livestock
farmland. There are several Main Rivers in the ward; Monks’ Ditch runs through
the central west of the ward and Hundred Perches Reen runs through the central
east of the ward. Other Main Rivers include Windmill Reen, Ridings Reen and
Elver Pill Reen. Much of the ward falls within the Caldicot Level drainage
district.
7.12.2 Ordinary watercourses and surface water flood risk
The available data indicates some isolated patches of medium/high risk flooding
from ordinary watercourses however these are only present in a few patches to the
north of the ward. Problems may also occur in isolated locations, for example due
to culvert restrictions. As many of the ordinary watercourses are culverted where
they pass through developed areas it is difficult to distinguish between surface
water flooding and flooding from ordinary watercourses.
There is one reported instance of historical flooding from ordinary watercourses:
Location of Historic Flooding Reason
Station Road, Llanwern Surface water flooding caused by Monks’ Ditch
overflowing natural exceedence
The surface water flood maps show three main clusters of issues around Llanwern
and Bishton in the north of the ward. They are generally of medium/high risk but
with few properties. The surface water flood maps take a generalised approach to
the representation of drainage systems however the mapping is indicative of areas
most affected during high intensity storms or due to blockages.
Historic flood information details three instances of flooding due to surface water
in Llanwern which are detailed in the table below. This reported flood incident
relates to surface water flooding where the drainage systems cannot cope with
high intensity rainfall. The reported flood incidents may also relate to blocked
gullies or drains.
Location of Historic Flooding Reason
Bishton Rd, between Waltwood Rd and Bishton Surface Water Flooding/culvert flooding
Llanwern Village Surface Water Flooding/culvert flooding
Lanstone Lane, Lanwern Village Surface Water Flooding/culvert flooding
44 Llanwern Ward Profile (2014) Newport city council
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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The table below summarises the impacts of flooding in Llanwern based on the
Surface Water Flood map, shown below.
Table 41 – Flood Risk Map counts for Llanwern
Totals in
Defined Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to 1
in 100
chance in
any year)
Low
(1 in 100
to 1 in
1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
2909 7 30 211
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
1254 3 8 24
Essential Services 149 0 1 2
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 47 3 7 42
Primary/Trunk Roads (km) 75.4 3.5 5.3 12.7
Mail Line Railways (km) 5.66 0.02 0.07 0.72
Agricultural Land - Grades 1, 2 and 3 (ha) 3988 5 10 64
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 37.30 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 37.30 0.00 0.00 0.00
Ramsar Sites (ha) 37.30 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI)
(ha) 2541.10 3.62 9.62 69.88
Sites of Interest for Nature Conservation
(SINC) (ha) 339.24 2.12 3.29 9.32
National Nature Reserves (NNR) (ha) 221.27 0.00 0.00 1.95
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 94.46 0.37 0.71 2.33
Registered Parks and Gardens (ha) 89.12 4.15 5.35 10.24
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 8.80 0.00 0.00 0.10
Listed Buildings (n) 16 0 0 0
Essential Settings of Regional Planning
Guidance (ha) 45.93 3.71 5.37 9.06
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Newport City Council Newport Local Flood Risk Management
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7.12.3 Groundwater
There are no recorded groundwater flood incidents.
7.12.4 Sewer Flooding
There are 3 reported instances of DG5 sewer flooding in this ward.
7.12.5 Measures to reduce local flood risk
The main flood risks are identified as follows:
Station Road, Llanwern - Located adjacent to the Main River Monks’ Ditch, a
small number of properties and services are predicted at risk of surface water
flooding. The Llanwern Village culvert inlet grid has been identified as
‘critical’ by NCC. The Fire Service record three incidents pumping water out
from flooded properties. Historic surface water flooding incidents are recorded
by NCC, however significant desilting of surface water drainage in 2013 has
subsequently been completed. Monitoring is proposed.
Langstone Road, Llanwern – Located upstream of Station Road, recurrent
highway ponding is recorded by NCC. Investigations recently completed by
NCC identified the cause as culvert capacity restrictions due to tree roots and
a scheme is proposed to replace and upsize the culvert. A funding application
by the Community Council is ongoing and monitoring is proposed.
Waltwood Road / Birch Road, Underwood – A cluster of properties are
predicted at medium flood risk. Although no flooding is recorded by NCC,
nearby the Fire Service recorded an incident of pumping of the flooded
highway. Further investigation and monitoring is proposed.
Bishton – A number of properties are predicted at medium risk of surface
water flooding. No incidents are recorded within the village although
upstream NCC record recurring flooding of the highway between Waltwood
Road and Bishton. Additional gullies and culvert upsizing was completed by
NCC in 2014 as part of a highway enhancement scheme. Further monitoring is
planned.
The following measures are identified to reduce flood risk.
Newport City Council Newport Local Flood Risk Management
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Table 42 – Local Flood Risk Management measures for Llandwern
Location and
Description
Measure Timescale Indicative Cost Strategic
Context
J1 Station Road,
Llanwern
Monitor Ongoing N/A (Revenue) M53, M44
J2 Langstone Lane,
Llanwern
Culvert
improvement
works
Short term
(0-5 years)
(170m upsize
from 225dia to
450dia)
£30-50k
(nominal
estimate)
M33, M34
J3 Monitor Ongoing N/A (Revenue) M53, M44
J4 Waltwood Road /
Birch Road,
Underwood
Investigate
Short term
(0-5 years)
3 days FTE and
£2k survey
M24
J5 Monitor Ongoing N/A (Revenue) M53, M44
J6 Bishton Monitor Ongoing N/A (Revenue) M53, M44
Total (non-revenue) 3days FTE and £32-52k
Recovery and review Preventing
4 1
4 2
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
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7.13 Malpas Ward
7.13.1 Overview
Malpas Ward is situated along the northern border of NCC, to the north of Central
Newport. It has a population of 7,84434 and an area of 2.1km2, which is
approximately 1.0% of the total area of Newport45. The ward gently slopes
southwards and consists of predominately residential housing. The Main River
Usk borders the south east of the ward for a short length.
7.13.2 Ordinary watercourses and surface water flood risk
The available data indicates some isolated patches of medium/high risk flooding
from ordinary watercourses running down the eastern boundary of the ward.
Problems may also occur in isolated locations, for example due to culvert
restrictions. As many of the ordinary watercourses are culverted where they pass
through developed areas it is difficult to distinguish between surface water
flooding and flooding from ordinary watercourses.
There are no reported instances of historical flooding from ordinary watercourses
in Malpas.
The surface water flood maps show two main clusters of issues around Malpas in
the centre/east of the ward adjacent to Rowan Way. There are two patches of high
risk areas here with some properties potentially affected. The surface water flood
maps take a generalised approach to the representation of drainage systems
however the mapping is indicative of areas most affected during high intensity
storms or due to blockages.
Historic flood information details four instances of flooding due to surface water
in Malpas which are detailed in the table below. These reported flood incidents
relate to surface water flooding where the drainage systems cannot cope with high
intensity rainfall. The reported flood incidents may also relate to blocked gullies
or drains.
Location of Historic Flooding Reason
Larch Grove, Malpas Surface Water Flooding (Flash Flood)
Almond Drive, Malpas Surface Water Flooding (Flash Flood)
Llanover Close, Malpas Surface Water Flooding (Flash Flood)
Wavell Drive, Malpas Surface Water Flooding (Flash Flood)/culvert
flooding
The table below summarises the impacts of flooding in Malpas based on the
Surface Water Flood map, shown below.
45 Malpas Ward Profile (2014) Newport city council
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Table 43 – Flood Risk Map counts for Malpas
Totals in
Defined Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100 to
1 in 1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
7939 12 46 295
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
3422 3 9 44
Essential Services 27 0 0 1
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 29 1 1 2
Primary/Trunk Roads (km) 31.5 0.5 1.6 5.6
Mail Line Railways (km) 0.00 0.00 0.00 0.00
Agricultural Land - Grades 1, 2 and 3 (ha) 206 0 0 1
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 3.41 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI)
(ha) 3.41 0.00 0.00 0.00
Sites of Interest for Nature Conservation
(SINC) (ha) 12.37 0.68 1.22 1.93
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 3.22 0.06 0.12 0.24
Registered Parks and Gardens (ha) 0.07 0.00 0.00 0.02
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00
Listed Buildings (n) 8 0 0 0
Essential Settings of Regional Planning
Guidance (ha) 0.00 0.00 0.00 0.00
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Newport City Council Newport Local Flood Risk Management
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7.13.3 Groundwater
There are no recorded groundwater flood incidents.
7.13.4 Sewer Flooding
There are 12 reported instances of DG5 sewer flooding in this ward.
7.13.5 Measures to reduce local flood risk
The main flood risks are identified as follows:
Larch Grove / Pilton Vale – Two clusters of properties are predicted at high
risk of surface water flooding. Surface water flooding is recorded to eight
properties and the Fire Service record pumping of flood water from the
highway and properties. Anecdotal comments suggest this is on the alignment
of a historic stream and ponding risk is exacerbated by a former railway
embankment downstream. Some property sewer flooding incidents are
recorded, but the sewerage is recorded as a separate foul and storm system. To
the north, the site of a historic spring causes intermittent land drainage issues
and NCC have historically constructed an interception trench to divert flows
away from properties. Discussions into the ownership of the surface water
sewerage are ongoing. Investigation to reduce the risk of overland flow
ponding behind the embankment, monitoring and liaison with DCWW is
proposed.
Almond Drive / Japonica Close – Surface water flooding is predicted to a
small number of properties, with ponding upstream of the former railway
embankment. NCC are working to reduce the risk of surface water runoff
from Malpas Park Primary school and modest attenuation works are proposed
to hold back peak flows, with further monitoring.
Larch Court / Larch Grove – A small number of properties and the highway
are predicted at medium risk of surface water flooding. Anecdotal comments
are that there has been recent carriageway flooding and liaison with the
(unadopted) highway owner is proposed to progress improvements to highway
drainage, with ongoing monitoring.
Horrocks Close – A small number of properties are predicted at low risk of
surface water flooding along the line of an historic watercourse. Some
property sewer flooding incidents are recorded, but the sewerage is recorded
as a separate foul and storm system. Liaison with DCWW and ongoing
monitoring is proposed.
Malpas Road North, Alanbrooke Avenue – Whilst no surface water flooding
to property is predicted, anecdotal comments suggest that highway drainage
risk to property has been experienced. Works to address maintenance issues
with storm drainage and monitoring are proposed.
Graig Park Road – A cluster of properties are predicted at risk of surface water
flooding. NCC recently replaced the surface water culvert but the area is in a
topographic depression and ongoing monitoring is planned.
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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The following measures are identified to reduce flood risk.
Table 44 – Local Flood Risk Management measures for Malpas
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
K1 Larch Grove /
Pilton Vale
Investigation into
ownership of
sewerage.
Short term
(0-5 years)
3 days FTE
and £1k
survey
M53, M44
K2 Investigate risk and
mitigation of
ponding.
Short term
(0-5 years)
3 days FTE
and £2k
survey
M24
K3 Liaison with
DCWW.
Ongoing N/A
(Revenue)
M53, M44
K4 Monitor Ongoing N/A
(Revenue)
M53, M44
K5 Almond Drive /
Japonica Close
Works to address
surface water
runoff.
Short term
(0-5 years)
£10k nominal
estimate
M24
K6 Monitor Ongoing N/A
(Revenue)
M53, M44
K7 Larch Court /
Larch Grove
Liaison with
highway drainage
owner
Short term
(0-5 years)
1day FTE M24
K8 Monitor Ongoing N/A
(Revenue)
M53, M44
K9 Horrocks Close Liaison with
DCWW.
Ongoing N/A
(Revenue)
M53, M44
K10 Monitor Ongoing N/A
(Revenue)
M53, M44
K11 Malpas Road /
Alanbrooke
Avenue
Drainage
improvement works
Short term
(0-5 years)
£10-15k
(nominal
estimate)
M24
K12 Monitor Ongoing N/A
(Revenue)
M53, M44
K13 Graig Park Road Monitor Ongoing N/A
(Revenue)
M53, M44
Total (non-revenue) 7days FTE and £23-28k
Recovery and review Preventing
9 4
9 0
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
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7.14 Marshfield Ward
7.14.1 Overview
Marshfield Ward is situated along the coast and the edge of the western border of
NCC, to the south-west of Central Newport. It has a population of 6,30334 and an
area of 44.81km2, which is approximately 20.6% of the total area of Newport46.
The ward gently slopes north to south, onto the valley plain, which consists of
livestock and arable farmland. There is some industrial development to the north-
east of the ward.
Main rivers include Drenewydd Reen, Broadway Reen, Rhosog Fawr Reen,
Tarwick Reen, Hawse Reen, Wharf Reen, Newgout Pill, Pont-y-cw cw, Gout
Fawr Pill and the Ebbw River. Much of the ward is within the Wentlooge Level
drainage district.
7.14.2 Ordinary watercourses and surface water flood risk
The available data indicates some limited areas of low risk flooding from ordinary
watercourses with one larger low to medium risk area in the centre of the ward
near Coedkernew. Higher risk flooding problems may also occur in isolated
locations, for example due to culvert restrictions. As many of the ordinary
watercourses are culverted where they pass through developed areas it is difficult
to distinguish between surface water flooding and flooding from ordinary
watercourses.
There are two reported instances of historical flooding from ordinary watercourses
in Marshfield which are detailed in the table below:
Location of Historic Flooding Reason
St Alban's Cottage, St Mellon's
Road
Surface water flooding, natural exceedence from
ordinary watercourse
Woodside, Duffryn Surface water flooding caused by Tredegar Reen
overflowing, natural exceedence from ordinary
watercourse
The surface water flood maps show three main clusters of issues spread
throughout the central belt of the ward at Marshfield, Imperial Park and Duffryn
Drive. Most of these areas are low risk associated with the watercourses and
reens. The surface water flood maps take a generalised approach to the
representation of drainage systems however the mapping is indicative of areas
most affected during high intensity storms or due to blockages.
Historic flood information details one instance of flooding due to surface water in
Marshfield which is detailed in the table below. These reported flood incidents
relate to surface water flooding where the drainage systems cannot cope with high
intensity rainfall. The reported flood incidents may also relate to blocked gullies
or drains.
46 Marshfield Ward Profile (2014) Newport city council
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Location of Historic Flooding Reason
Nantymor Cottages,
Coedkernew
Surface Water Flooding (Flash Flood)
The table below summarises the impacts of flooding in Marshfield based on the
Surface Water Flood map, shown below.
Table 45 – Flood Risk Map counts for Marshfield.
Totals in
Defined Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100
to 1 in
1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
5928 12 16 135
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
2555 4 5 32
Essential Services 69 0 0 0
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 119 4 6 23
Primary/Trunk Roads (km) 128.2 4.1 8.4 24.8
Mail Line Railways (km) 5.95 0.00 0.00 0.02
Agricultural Land - Grades 1, 2 and 3 (ha) 3538 26 53 215
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 117.64 0.00 0.03 0.17
Special Protection Areas (SPA) (ha) 117.63 0.00 0.03 0.17
Ramsar Sites (ha) 117.63 0.00 0.03 0.17
Sites of Special Scientific Interest (SSSI)
(ha) 1882.25 8.82 23.45 132.77
Sites of Interest for Nature Conservation
(SINC) (ha) 25.38 0.24 0.47 1.39
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 7.13 0.06 0.08 0.26
Registered Parks and Gardens (ha) 50.03 0.38 0.98 5.06
Country Parks (ha) 34.04 0.17 0.55 4.07
Scheduled Ancient Monuments (SAM) (ha) 2.70 0.01 0.02 0.03
Listed Buildings (n) 27 2 2 5
Essential Settings of Regional Planning
Guidance (ha) 54.31 0.07 0.27 0.85
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
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7.14.3 Groundwater
There are no recorded groundwater flood incidents.
7.14.4 Sewer Flooding
There are 71 reported instances of DG5 sewer flooding in this ward. The majority
of these are in a cluster to the south west of the ward.
7.14.5 Measures to reduce local flood risk
The main flood risks are identified as follows:
Marshfield – The highway and a small number of properties are predicted at
medium/low risk of surface water flooding throughout the community. An
incident of surface water flooding is recorded. The highway has been re-
profiled at Cambrian Way to divert overland flow. Property sewer flooding is
also recorded and anecdotal comments suggest that highway drainage
connects to the shallow sewer network. The drainage network is prone to
siltation and an enhanced regime of planned desilting is proposed, with liaison
with NRW and DCWW, and ongoing monitoring.
Blacksmiths Way / Nant-y-moor – Properties and the highway (A48) are
predicted at high risk of surface water flooding. Property flooding due to
surface water is recorded and the Fire Service have recorded two incidents of
pumping out flood water from property. Two culverts drain into the
Nanymoor Reen and investigation into its ownership and maintenance is
proposed. The culverts are maintained by riparian owners and liaison is
proposed. Upstream the catchment is rural and relatively small and so
investigation into catchment management is also planned, with ongoing
monitoring.
Jamaica Close / Dyffryn Drive / Woodside Estate (see also Section 7.21.5,
Tredegar Ward) – A large number of properties are predicted at low risk of
surface water flooding. An incident of surface water flooding is recorded at
Woodside, attributed to the capacity of the ordinary watercourse. The location
is immediately downstream of Tredegar Park Lake reservoir which is
culverted to discharge into Tredegar Reen. Investigation into the maintenance
of the culvert and reen is planned, with ongoing monitoring. The Tredegar
Reen, Duffryn culvert inlet grid has been identified as ‘critical’ by NCC.
Pound Hill / A48 – The highway (A48) is predicted at low risk of surface
water flooding. Whilst the adjacent M4 drainage manages much of the risk,
anecdotal comments suggest land drainage or groundwater flooding of the
highway is not uncommon. Further investigation and monitoring is planned.
Newport City Council Newport Local Flood Risk Management
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The following measures are identified to reduce flood risk.
Table 46 – Local Flood Risk Management measures for Marshfield
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
L1 Marshfield Enhanced drainage
desilting.
Ongoing N/A (Revenue) M35
L2 Liaison with
DCWW and NRW
Ongoing N/A (Revenue) M53, M44
L3 Monitoring Ongoing N/A (Revenue) M53, M44
L4 Blacksmiths Way
/ Nant-y-moor
Liaison with
riparian owners
Short term
(0-5 years)
1day FTE M24, M43
L5 Investigation into
upstream catchment
management
Short term
(0-5 years)
10days FTE
plus £8k survey
allowance
M24, M35
L6 Monitoring Ongoing N/A (Revenue) M53, M44
L7 Jamaica Close /
Dyffryn Drive /
Woodside
Investigate culvert
and reen
maintenance / inlet
Short term
(0-5 years)
4days FTE plus
£2k survey
M24, M35
L8 Monitoring Ongoing N/A (Revenue) M53, M44
L9 Pound Hill / A48 Investigate land
drainage and
ground water issue
Short term
(0-5 years)
4days FTE plus
£8k survey
allowance
M24, M35
L10 Monitoring Ongoing N/A (Revenue) M53, M44
Total (non-revenue) 19days FTE and £18k
Recovery and review Preventing
5 4
6 4
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
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7.15 Pillgwenlly Ward
7.15.1 Overview
Pillgwenlly Ward is situated in the central part of NCC, to the immediate south of
Central Newport. It has a population of 7,49034 and an area of 6.43km2, which is
approximately 2.96% of the total area of Newport47. The ward is flat and contains
industrial, commercial and some residential properties. Alexandra Docks is
located to the south of the ward. The main River Ebbw flows along the boundary
of the ward, to the south-west and the Usk to the east.
7.15.2 Ordinary watercourses and surface water flood risk
The available data indicates that limited areas of low risk flooding from ordinary
watercourses. Problems may occur in isolated locations, for example due to
culvert restrictions. As many of the ordinary watercourses are culverted where
they pass through developed areas it is difficult to distinguish between surface
water flooding and flooding from ordinary watercourses.
There are no reported instances of historical flooding from ordinary watercourses
in Pillgwenlly.
The surface water flood maps show isolated areas of low risk flooding with one a
few small areas of high risk flooing. The main areas of properties affected is in the
north of the ward in the vicinity of the Enterprise Park and is low risk only. The
surface water flood maps take a generalised approach to the representation of
drainage systems however the mapping is indicative of areas most affected during
high intensity storms or due to blockages.
A number of surface water pumping stations operate to reduce the risk of surface
water flooding, and flooding due to tide-lock.
Historic flood information details one instance of flooding due to surface water in
Pillgwenlly which is detailed in the table below. This reported flood incident
relates to a storm water pumping station.
Location of Historic Flooding Reason
Docks Way, under Rail Bridge,
Maesglas
Storm pumping station issue
The table below summarises the impacts of flooding in Pillgwennlly based on the
Surface Water Flood map, shown below.
47 Pillgwenlly Ward Profile (2014) Newport city council
Newport City Council Newport Local Flood Risk Management
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Table 47 – Flood Risk Map counts for Pillgwenlly
Totals in
Defined Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100
to 1 in
1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
7303 9 114 1206
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
3148 4 20 355
Essential Services 108 1 1 5
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 423 2 28 149
Primary/Trunk Roads (km) 47.4 1.1 4.2 16.1
Mail Line Railways (km) 5.43 0.16 0.43 1.18
Agricultural Land - Grades 1, 2 and 3 (ha) 548 0 0 0
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 72.87 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.25 0.00 0.00 0.00
Ramsar Sites (ha) 0.25 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI)
(ha) 84.12 0.00 0.02 0.12
Sites of Interest for Nature Conservation
(SINC) (ha) 8.26 0.02 0.29 0.39
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 0.00 0.00 0.00 0.00
Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00
Listed Buildings (n) 17 0 0 0
Essential Settings of Regional Planning
Guidance (ha) 0.00 0.00 0.00 0.00
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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7.15.3 Groundwater
There are no recorded groundwater flood incidents.
7.15.4 Sewer Flooding
There are 7 reported instances of DG5 sewer flooding in this ward.
7.15.5 Measures to reduce local flood risk
The main flood risks are identified as follows:
Usk Way / Docks Way – The highway is predicted at high risk of surface
water flooding. The partially-culverted Twenty-Acres Reen drains the area
and a significant upstream development. Further investigation into the
maintenance and operation of the highway drainage and reen is proposed, with
ongoing monitoring.
Commercial Road / Ruperra Street / Potter Street / New Street / Church Street
/ Pottery Road / Baldwin Street – A large number of properties, essential
services and highways are predicted at low/medium risk of surface water
flooding throughout much of the east of the ward. The Fire Service recorded
13 incidents of pumping flood water from property and the highway. The area
is largely drained by the combined sewer network, which discharges into an
interceptor tunnel and so avoids tide lock. The drainage network is prone to
blockage and siltation due to the typical shallow gradients. Liaison with
DCWW is proposed to better understand the performance of the drainage
network, a review of silt management and ongoing monitoring.
The following measures are identified to reduce flood risk.
Table 48 – Local Flood Risk Management measures for Pillgwenlly
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
M1 Usk Way /
Docks Way
Investigate highway
drainage and reen
maintenance and
operation
Short term
(0-5 years)
4days FTE
plus £2k
survey
M24, M35
M2 Monitoring Ongoing N/A
(Revenue)
M53, M44
M3 Commercial
Road
Review of silt
management
Short term
(0-5 years)
6days FTE
plus £5k
survey
M24, M35
M4 Liaison with DCWW Ongoing N/A
(Revenue)
M53, M44
M5 Monitoring Ongoing N/A
(Revenue)
M53, M44
Total (non-revenue) 10days FTE and £7k
Recovery and review Preventing
3 2
3 2
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
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7.16 Ringland Ward
7.16.1 Overview
Ringland Ward is situated in the central part of NCC, to the east of Central
Newport. It has a population of 8,47834 and an area of 2.44km2, which is
approximately 1.12% of the total area of Newport48. The ward is relatively flat,
slightly sloping north to south, and contains a high concentration of residential
properties.
There are no Main Rivers in Ringland.
7.16.2 Ordinary watercourses and surface water flood risk
The available data indicates some areas of high risk flooding from ordinary
watercourses in the south of the ward. Higher risk flooding problems may also
occur in isolated locations, for example due to culvert restrictions. As many of the
ordinary watercourses are culverted where they pass through developed areas it is
difficult to distinguish between surface water flooding and flooding from ordinary
watercourses.
There is one reported instance of historical flooding from ordinary watercourses
in Ringland which is detailed in the table below.
Location of Historic Flooding Reason
Llanwern Road Ordinary watercourses blockage or natural flood
The surface water flood maps show three main clusters of issues spread
throughout the ward; near Ringland Way roundabout in the south, by Handel
Close in the east and Howe Circle in the north. There are larger patches of high
risk flooding in the vicinity of Handel Close and Ringland Way, with Howe Circle
in the north being a lower risk. The surface water flood maps take a generalised
approach to the representation of drainage systems however the mapping is
indicative of areas most affected during high intensity storms or due to blockages.
Historic flood information details one instance of flooding due to surface water in
Ringland which is detailed in the table below. This reported flood incident relates
to surface water flooding, it may relate to where the drainage systems cannot cope
with high intensity rainfall or to blocked gullies or drains.
Location of Historic Flooding Reason
Anson Green Surface water flooding
The table below summarises the impacts of flooding in Ringland based on the
Surface Water Flood map, shown below.
48 Ringland Ward Profile (2014) Newport city council
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Table 49 – Flood Risk Map counts for Ringland
Totals in
Defined Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100 to
1 in 1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
8837 70 202 872
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
3809 20 43 182
Essential Services 29 0 0 1
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 24 0 1 4
Primary/Trunk Roads (km) 38.9 3.9 7.6 17.2
Mail Line Railways (km) 0.00 0.00 0.00 0.00
Agricultural Land - Grades 1, 2 and 3 (ha) 243 1 2 5
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI)
(ha) 0.00 0.00 0.00 0.00
Sites of Interest for Nature Conservation
(SINC) (ha) 13.15 1.06 2.23 2.88
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 10.49 0.01 0.07 0.49
Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00
Listed Buildings (n) 0 0 0 0
Essential Settings of Regional Planning
Guidance (ha) 0.00 0.00 0.00 0.00
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
Newport City Council Newport Local Flood Risk Management
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7.16.3 Groundwater
There are no recorded groundwater flood incidents.
7.16.4 Sewer Flooding
There are 9 reported instances of DG5 sewer flooding in this ward.
7.16.5 Measures to reduce local flood risk
The main flood risks are identified as follows:
Ringland Way – A large number of properties are predicted at low/medium
risk of surface water flooding and the highway (A48) at high risk. The issue is
linked to the adjacent upstream Ringland Circle/Stanford Road (see Section
7.4.5, Alway Ward). No historic incidents of surface water flooding are
recorded. The area is drained by a partially culverted ordinary watercourse
which discharges into Liswerry Pill Reen and the Drainage District. The
adjacent Hartridge Farm surface water lagoon is over 3ha in size and
anecdotal comments suggest maintenance is required to reduce upstream flood
risk. The area, also known as Ringland Way Marsh, is designated as an SINC
however there is thought to be extensive invasive species present and limited
amenity value with no formalised public access. Investigation to optimise the
management of the site and monitoring is proposed.
Playford Crescent – A large number of properties and the highway are
predicted at medium/high risk of surface water flooding. No historic incidents
of surface water flooding are recorded. Further investigation into the culvert
inlets and monitoring is proposed.
Cunningham Road / Anson Green – A number of properties are predicted at
medium risk of surface water flooding. The highway is predicted at high risk
of surface water ponding. A surface water flooding incident is recorded at
Anson Green and immediately downstream at Llanwern Road due to blockage
or exceedance of the ordinary watercourse. The area is served by a partially-
culverted ordinary watercourse. Some property sewer flooding is recorded but
the area is understood to be served by a separate foul and storm sewer
network. Further investigation into the culvert capacity and the four inlet grids
is planned, with ongoing monitoring. Upstream woodland may present
opportunities for attenuation storage to hold back peak flows.
Bishpool Avenue – A small number of properties are predicted at medium/low
risk of surface water along the alignment of an historic watercourse. No
historic flooding incidents are recorded. The area is drained by a partially
culverted watercourse. Investigation in to the culvert inlet grids and ongoing
monitoring is proposed. Opportunities to attenuate flows will be explored in
the ‘North of Ringland Circle’ open space, linked to Ringland Circle/Stanford
Road downstream (see Section 7.4.5, Alway Ward).
Newport City Council Newport Local Flood Risk Management
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Coldra – The A229 / A48 / M4 roundabout is predicted at high risk of surface
water flooding. Flows from the upstream Coldra Wood are culverted – links to
Blossom Close (see Section 7.10.5, Langstone Ward). Monitoring is proposed.
The following measures are identified to reduce flood risk.
Table 50 – Local Flood Risk Management measures for Ringland
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
N1 Ringland Way Investigate downstream
lagoon maintenance/
operation
responsibilities.
Short term
(0-5 years)
3days FTE M24
N2 Lagoon enhancements Short term
(0-5 years)
£10-40k
nominal
estimate
M33, M34
N3 Monitoring Ongoing N/A
(Revenue)
M53, M44
N4 Playford
Crescent
Culvert inlet
investigation
Short term
(0-5 years)
3 days FTE
and £2k
survey
M24
N5 Monitoring Ongoing N/A
(Revenue)
M53, M44
N6 Cunningham
Road / Anson
Green
Culvert inlet (4xgrids)
investigation
Short term
(0-5 years)
5 days FTE
and £5k
survey
M24
N7 Monitoring Ongoing N/A
(Revenue)
M53, M44
N8 Bishpool
Avenue
Culvert inlet
investigation
Short term
(0-5 years)
3 days FTE
and £2k
survey
M24
N9 Investigation into
upstream attenuation
and catchment
restoration
Short term
(0-5 years)
5days FTE M24, M31
N10 Monitoring Ongoing N/A
(Revenue)
M53, M44
N11 Coldra Monitoring Ongoing N/A
(Revenue)
M53, M44
Total (non-revenue) 19days FTE and £19-49k
Recovery and review Preventing
5 5
5 3
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
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7.17 Rogerstone Ward
7.17.1 Overview
Rogerstone Ward is situated along the northern border of NCC, to the north-west
of Central Newport. It has a population of 10,11534 and an area of 8.66km2, which
is approximately 4.0% of the total area of Newport49. The ward steeply slopes
down to the valley floor which consists of predominantly residential properties,
with some areas of commercial uses. The landuse of the hillslope is livestock and
arable farmland.
The Main River Ebbw borders the west of the ward.
7.17.2 Ordinary watercourses and surface water flood risk
The available data indicates that limited areas of low risk flooding from ordinary
watercourses. Problems may occur in isolated locations, for example due to
culvert restrictions. As many of the ordinary watercourses are culverted where
they pass through developed areas it is difficult to distinguish between surface
water flooding and flooding from ordinary watercourses.
There is one reported instance of historical flooding from ordinary watercourses
in Rogerstone which is detailed in the table below.
Location of Historic Flooding Reason
The Uplands, Rogerstone Surface water flooding from natural exceedence
or ordinary watercourse
There are three main clusters of surface water flooding in Rogerstone in the west
of the ward at Rogerstone Station/Oak Tree Drive, Wern Industrial Estate and
near Myrtle Drive/Pye Corner. Although generally low risk there are areas of
medium/high risk in these areas. The surface water flood maps take a generalised
approach to the representation of drainage systems however the mapping is
indicative of areas most affected during high intensity storms or due to blockages.
Historic flood information details two instances of flooding due to surface water
in Rogerstone which is detailed in the table below. This reported flood incident
relates to surface water flooding, it may also relate to where the drainage systems
cannot cope with high intensity rainfall or to blocked gullies or drains.
Location of Historic Flooding Reason
The Uplands, Rogerstone Surface Water Flooding (Flash Flood)/culvert
flooding
Pye Corner, Rogerstone Surface Water Flooding/culvert flooding
The table below summarises the impacts of flooding in Rogerstone based on the
Surface Water Flood map, shown below.
49 Rogerstone Ward Profile (2014) Newport city council
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Table 51 – Flood Risk Map counts for Rogerstone
Totals in
Defined
Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100 to
1 in 1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
10066 16 118 810
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
4339 5 18 131
Essential Services 50 0 0 2
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 76 5 12 56
Primary/Trunk Roads (km) 61.5 3.2 7.7 20.7
Mail Line Railways (km) 3.59 0.23 0.52 1.56
Agricultural Land - Grades 1, 2 and 3 (ha) 865 11 17 34
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI)
(ha) 0.00 0.00 0.00 0.00
Sites of Interest for Nature Conservation
(SINC) (ha) 130.23 8.03 11.37 15.84
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 136.23 1.60 2.36 5.37
Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 3.79 0.23 0.44 0.97
Listed Buildings (n) 13 0 1 3
Essential Settings of Regional Planning
Guidance (ha) 0.00 0.00 0.00 0.00
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
Newport City Council Newport Local Flood Risk Management
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7.17.3 Groundwater
There are no recorded groundwater flood incidents.
7.17.4 Sewer Flooding
There are 7 reported instances of DG5 sewer flooding in this ward.
7.17.5 Measures to reduce local flood risk
The main flood risks are identified as follows:
The Uplands / Wern Industrial Estate – A medium/high risk of surface water
flooding is predicted to the highways and a number of services/industrial
areas. There are historic surface water flooding incidents recorded with some
property flooding. Maintenance by NCC in 2013 cleared silt, debris and roots
in the surface water culvert. The sewer network in this area is understood to be
a mix of combined and separate. There are anecdotal comments that the
surface water network manhole benching is in a poor condition and increases
the risk of blockages. A scheme is proposed to address this issue. Further
investigation into culvert/surface water drainage capacity and monitoring is
planned, along with liaison with DCWW on surface water disconnection
opportunities.
Myrtle Drive – A large number of properties are predicted at low/medium risk
of surface water flooding. The sewer network in this area is generally separate.
No surface flooding incidents are recorded. The area is served by a culvert
running under the A467 highway embankment and discharging to the Ebbw
River. Further investigation into the inlet arrangement and monitoring is
recommended.
Rogerstone Station/Oak Tree Drive – there are some areas of predicted surface
water ponding. The sewer network in this area is generally separate, further
investigation into the drainage arrangement and monitoring is recommended.
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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The following measures are identified to reduce flood risk.
Table 52 – Local Flood Risk Management measures for Rogerstone
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
O1 Uplands/Wern
Industrial Estate
Improve flow
conveyance by re-
benching manhole
Short term
(0-5 years)
£10-15k M33
O2 Investigation into
storm drainage
capacity
Short term
(0-5 years)
3days FTE
plus £2k
survey
M24
O3 Monitor Ongoing N/A
(Revenue)
M53, M44
O4 Myrtle Drive/Pye
Corner
Investigate drainage
arrangement
Short term
(0-5 years)
2days FTE
plus £2k
survey
M24
O5 Monitor Ongoing N/A
(Revenue)
M53, M44
O6 Rogerstone
Station/Oak Tree
Drive
Investigation into
drainage
arrangement
Short term
(0-5 years)
3days FTE
plus £2k
survey
M24
07 Monitor Ongoing N/A
(Revenue)
M53, M44
Total (non-revenue) 8days FTE plus £16-21k
Recovery and review Preventing
3 3
3 1
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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7.18 Shaftesbury Ward
7.18.1 Overview
Shaftesbury Ward is situated in the central part of NCC, to the immediate north of
Central Newport. It has a population of 5,15934 and an area of 1.76km2, which is
approximately 0.8% of the total area of Newport50. Shaftesbury is a relatively flat
ward with a gentle slope from north to south, while bordering the River Usk to the
east. The ward consists of industrial, residential and commercial buildings.
7.18.2 Ordinary watercourses and surface water flood risk
The available data indicates that limited areas of low risk flooding associated with
ordinary watercourses. Problems may occur in isolated locations, for example due
to culvert restrictions. As many of the ordinary watercourses are culverted where
they pass through developed areas it is difficult to distinguish between surface
water flooding and flooding from ordinary watercourses.
There is one reported instance of historical flooding from ordinary watercourses
in Shaftesbury which is detailed in the table below.
Location of Historic Flooding Reason
Goodrich Crescent and
surrounding areas
Intense rainfall during October 2000 causing
ordinary watercourse flooding
There is one main area of surface water flooding in Shaftesbury in the central west
of the ward near Malpas Road and Malpas Lane. Although generally low risk
there are areas of medium/high risk which could affect properties. The surface
water flood maps take a generalised approach to the representation of drainage
systems however the mapping is indicative of areas most affected during high
intensity storms or due to blockages.
Historic flood information details one instance of flooding due to surface water in
Shaftesbury which is detailed in the table below. This reported flood incident
relates to surface water flooding where the drainage systems cannot cope with
high intensity rainfall. The reported flood incidents may also relate to blocked
gullies or drains.
Location of Historic Flooding Reason
Bryn Bevan, Shaftesbury Surface Water Flooding (Flash Flood)
The table below summarises the impacts of flooding in Shaftesbury based on the
Surface Water Flood map, shown below.
50 Shaftesbury Ward Profile (2014) Newport city council
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Table 53 – Flood Risk Map counts for Shaftesbury
Totals in
Defined
Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100 to
1 in 1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
5710 26 88 677
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
2461 7 22 196
Essential Services 28 0 0 3
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 129 2 2 41
Primary/Trunk Roads (km) 29.7 1.3 3.5 10.1
Mail Line Railways (km) 0.01 0.00 0.00 0.00
Agricultural Land - Grades 1, 2 and 3 (ha) 163 0 0 0
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 10.67 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI)
(ha) 10.80 0.00 0.00 0.00
Sites of Interest for Nature Conservation
(SINC) (ha) 13.43 0.27 0.40 0.63
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 3.60 0.00 0.00 0.04
Registered Parks and Gardens (ha) 7.43 0.01 0.02 0.08
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00
Listed Buildings (n) 6 1 1 2
Essential Settings of Regional Planning
Guidance (ha) 0.00 0.00 0.00 0.00
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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7.18.3 Groundwater
There are no recorded groundwater flood incidents.
7.18.4 Sewer Flooding
There are 5 reported instances of DG5 sewer flooding in this ward.
7.18.5 Measures to reduce local flood risk
The main flood risks are identified as follows:
Kimberly Terrace / Malpas Road – A number of properties are predicted at
medium risk of surface water. There are anecdotal comments of historic
property flooding and the Fire Service attended an incident to pump out
floodwater in this area. The sewer system is understood to be a separate
foul storm system upstream of the M4 but is understood to drain into a
combined system to the south. NCC consider the Malpas M4 Roundabout
surface water pumping station as ‘high risk’ and have telemetry installed.
Some sewer property flooding is recorded. Liaison with DCWW is
recommended to investigate surface water disconnection opportunities.
Investigation into the culvert inlet arrangement and maintenance
responsibilities are also proposed, with ongoing monitoring.
Llanover Close / Malpas Road - A small number of properties are
predicted at medium risk of surface water. Surface water flooding of
property gardens is recorded in Llanover Close. The area is immediately
downstream of Graig Park Road (See Section 7.13.5, Malpas Ward) and
drained by a culvert to Malpas Brook. Further investigation into the
culvert inlet arrangement is proposed, with ongoing monitoring.
Pant Road - A number of properties are predicted at low/medium risk of
surface water. No historic surface water property flooding is recorded
however there are anecdotal comments of garden flooding. Investigation
into the ownership and maintenance of a culvert is planned. The area is
drained by a combined network and some sewer property flooding is
recorded. Liaison with DCWW is recommended to investigate surface
water disconnection opportunities.
Bryn Bevan – A small cluster of properties is predicted at medium risk of
surface water flooding. Historic surface water flooding of a property is
recorded. The area is understood to be drained by a separate foul and
storm sewerage network and investigation into localised improvements to
the highway drainage in the topographic depression are proposed with
ongoing monitoring.
Agincourt Street / Argyle Street – Properties are predicted at medium risk
of flooding. Whilst no historic surface water property flooding is recorded,
the Fire Service have attended to pump flooding of the highway. The area
comprises a mixture of residential and industrial properties and is adjacent
to Crindau Pill. Investigation into the surface water drainage system
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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arrangement is proposed, including the condition of tidal outfalls. NRW
are currently implementing a main river flood risk management scheme
and opportunities for surface water flood risk betterment through
partnership working will be proposed with ongoing monitoring.
Hoskins Street / Wheeler Street – A number of properties are predicted at
low/medium risk of surface water flooding. Whilst no historic surface
water property flooding is recorded, the Fire Service have attended to
pump a flooded property. As above, investigation into the surface water
drainage system is proposed, seeking opportunities for surface water flood
risk betterment through partnership working with NRW and ongoing
monitoring.
Old Green North – The surface water pumping station has been closed.
Investigation and subsequent decommissioning is proposed should it be
redundant.
Goodrich Crescent – A small number of properties are predicted at low
risk of surface water flooding. Historic flooding is recorded, attributed to
main river sources. Property sewer flooding in the area is also recorded.
Ongoing monitoring is planned.
Harlequin Drive – A number of properties are predicted at low/medium
risk of surface water flooding however no historic flooding is recorded.
Ongoing monitoring is planned with investigation of the upstream culvert
inlet arrangement and maintenance. There may be enhancement
opportunities linked to the upstream Barrack Hill SINC.
The following measures are identified to reduce flood risk.
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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Table 54 – Local Flood Risk Management measures for Shaftesbury
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
P1 Kimberly
Terrace /
Malpas Road
Liaison with DCWW on
surface water disconnection
opportunities
Ongoing N/A
(Revenue)
M24,
M35
P2 Liaison with riparian owners
regarding
maintenance/operation
responsibilities.
Short term
(0-5years)
2days FTE M24,
M43
P3 Monitor Ongoing N/A
(Revenue)
M53,
M44
P4 Llanover
Close /
Malpas Road
Investigation into culvert
inlet arrangement
Short term
(0-5years)
3days FTE
plus £2k
survey
M24
P5 Monitor Ongoing N/A
(Revenue)
M53,
M44
P6 Pant Road Liaison with DCWW on
surface water disconnection
opportunities
Ongoing N/A
(Revenue)
M24,
M35
P7 Monitor Ongoing N/A
(Revenue)
M53,
M44
P8 Bryn Bevan Investigation into localised
highway drainage
improvements
Short term
(0-5years)
1day FTE M24
P9 localised highway drainage
improvements
Short term
(0-5years)
£5-10k M33
P10 Monitor Ongoing N/A
(Revenue)
M53,
M44
P11 Agincourt
Street /
Argyle Street
Investigation into surface
water drainage condition
Short term
(0-5years)
3days FTE
plus £2k
survey
M24
P12 Partnership working with
NRW on surface water
betterment
Ongoing N/A
(Revenue)
M35
P13 Monitor Ongoing N/A
(Revenue)
M53,
M44
P14 Hoskins Street
/ Wheeler
Street
Investigation into surface
water drainage condition
Short term
(0-5years)
2days FTE
plus £2k
survey
M24
P15 Partnership working with
NRW on surface water
betterment
Ongoing N/A
(Revenue)
M35
P16 Monitor Ongoing N/A
(Revenue)
M53,
M44
P17 Old Green
North
Investigation into
decommissioning
Short term
(0-5years)
2days FTE M24
P18 Goodrich
Crescent
Monitor Ongoing N/A
(Revenue)
M53,
M44
Total (non-revenue) 13days FTE plus £11-
16k
Recovery and review Preventing
6 7
7 5
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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7.19 St Julians Ward
7.19.1 Overview
St. Julians Ward is situated in the central part of NCC, to the immediate north-east
of Central Newport. It has a population of 8,71434 and an area of 2.18km2, which
is approximately 1.0% of the total area of Newport51. St Julians borders the River
Usk to the west and north. The ward gently slopes down, from east to west, and is
heavily concentrated with mainly residential, and a few industrial developments.
7.19.2 Ordinary watercourses and surface water flood risk
The available data indicates that limited areas of low risk flooding associated with
ordinary watercourses. Problems may occur in isolated locations, for example due
to culvert restrictions. As many of the ordinary watercourses are culverted where
they pass through developed areas it is difficult to distinguish between surface
water flooding and flooding from ordinary watercourses.
There is one reported instance of historical flooding from ordinary watercourses
in St Julians which is detailed in the table below:
Location of Historic Flooding Reason
Orchard Street Surface water flooding caused by Lotteries Reen
overflowing, natural exceedence of ordinary
watercourses
There are two main clusters of surface water flooding in St Julians, one in the
central area of the ward around of the ward around Rockfield Street, and the other
area to the north on the M4. There are areas of medium/high risk within these
areas which could affect properties or the major road network. The surface water
flood maps take a generalised approach to the representation of drainage systems
however the mapping is indicative of areas most affected during high intensity
storms or due to blockages.
Historic flood information details three instances of flooding due to surface water
in St Julians which is detailed in the table below. These reported flood incidents
relates to surface water flooding where the drainage systems cannot cope with
high intensity rainfall. The reported flood incidents may also relate to blocked
gullies or drains.
Location of Historic Flooding Reason
Caerleon Road, St Julians Surface Water Flooding (Flash Flood)
Orchard Street, St Julians Surface Water Flooding (Flash Flood)/culvert
flooding
Bank Street Surface water flooding caused by hydraulic
overload
The table below summarises the impacts of flooding in St Julians based on the
Surface Water Flood map, shown below.
51 St. Julians Ward Profile (2014) Newport city council
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Table 55 – Flood Risk Map counts for St Julians
Totals in
Defined
Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100 to
1 in 1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
8793 58 181 1179
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
3790 11 62 357
Essential Services 29 0 0 2
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 177 0 2 53
Primary/Trunk Roads (km) 31.7 1.6 4.2 10.2
Mail Line Railways (km) 2.70 0.01 0.03 0.11
Agricultural Land - Grades 1, 2 and 3 (ha) 195 0 0 0
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 28.77 0.00 0.00 0.01
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI)
(ha) 28.83 0.00 0.00 0.01
Sites of Interest for Nature Conservation
(SINC) (ha) 38.22 0.03 0.14 1.31
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 0.00 0.00 0.00 0.00
Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00
Listed Buildings (n) 2 0 0 0
Essential Settings of Regional Planning
Guidance (ha) 0.00 0.00 0.00 0.00
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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7.19.3 Groundwater
There are no recorded groundwater flood incidents.
7.19.4 Sewer Flooding
There are 16 reported instances of DG5 sewer flooding in this ward.
7.19.5 Measures to reduce local flood risk
The main flood risks are identified as follows:
Stafford Road / Orchard Street / Bank Street / Margaret Avenue – A large
number of properties are predicted at high/medium risk of surface water
flooding. Historic surface water flooding of properties is recorded in
Orchard Street, Bank Street and Caerleon Road. The Fire Service recorded
incidents pumping out flooded highway and property. Some sewer
property flooding is recorded in the area. The sewer network is combined
and so there are potential opportunities for surface water disconnection
through liaison with DCWW. Investigation into the arrangement,
condition and capacity of the surface water partially-culverted watercourse
and inlet grids which drains the area, running through open space to the
rear of St Anne’s Crescent and discharging under the railway to the River
Usk is proposed. Upstream opportunities for attenuation storage to hold
back peak flows will be explored. Anecdotal comments suggest the
downstream Lotteries Reen has maintenance and siltation issues. Ongoing
monitoring is also proposed.
Clippers Close – Surface water flooding is predicted to the highway. To
the rear of properties, a culverted watercourse is shown to be the site of
ponding. The Fire Service record minor flooding incident. Investigation of
the capacity, ownership and maintenance of the culvert is proposed, noting
access is restricted, with ongoing monitoring.
M4 Junction 25 – Surface water flooding is predicted to the highway.
Liaison with SWTRA is proposed to ensure their maintenance and
resilience planning considers the residual risk should existing drainage
fail, with ongoing monitoring.
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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The following measures are identified to reduce flood risk.
Table 56 – Local Flood Risk Management measures for St Julians
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
Q1 Stafford
Road/Orchard
Street / Bank Street
/ Margaret Avenue
Investigate drainage
arrangement,
maintenance
responsibilities and
capacity
Short term
(0-5years)
15days FTE
and £5k
survey
M24, M34
Q2 Investigate culvert
inlet screen and
capacity at Lotteries
Reen
Short term
(0-5years)
3days FTE
and £3k
survey
M24, M34
Q3 Liaison with DCWW
on surface water
disconnection
opportunities
Short term
(0-5years)
N/A
(revenue)
M24, M34
Q4 Monitor Ongoing N/A
(revenue)
M53, M44
Q5 Clippers Close Investigation of
culvert capacity,
ownership and
maintenance.
Short term
(0-5years)
4days FTE
and £3k
surveys
M24, M34
Q6 Monitor Ongoing N/A
(revenue)
M53, M44
Q9 M4 Junction 25 Liaison with SWTRA 1day FTE M35
Q10 Monitor Ongoing N/A
(revenue)
M53, M44
Total (non-revenue) 23days FTE plus £11k
Recovery and review Preventing
3 4
3 5
Preparing Protecting
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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7.20 Stow Hill Ward
7.20.1 Overview
Stow Hill Ward is situated in the central part of NCC, covering a central area of
Central Newport. It has a population of 4,90334 and an area of 1.38km2, which is
approximately 0.6% of the total area of Newport52. Stow Hill has a small area of
raised elevation in the centre of the ward. The ward borders the River Usk to the
east, and mainly consists of residential, commercial and industrial developments.
7.20.2 Ordinary watercourses and surface water flood risk
The available data indicates that there are minimal areas of low risk flooding
associated with ordinary watercourses. Problems may occur in isolated locations,
for example due to culvert restrictions. As many of the ordinary watercourses are
culverted where they pass through developed areas it is difficult to distinguish
between surface water flooding and flooding from ordinary watercourses.
There is one reported instance of historical flooding from ordinary watercourses
in Stow Hill which is detailed in the table below
Location of Historic Flooding Reason
Newport City Centre Intense rainstorm during July 1997 caused
extensive surface water flooding in and around
Newport centre. Natural exceedence and flash
flood
There is one main area of surface water flooding in Stow Hill in the north of the
ward near Cambrian Road. This area shows mainly medium and high risk with
some properties and roads affected. The surface water flood maps take a
generalised approach to the representation of drainage systems however the
mapping is indicative of areas most affected during high intensity storms or due to
blockages.
A number of surface water pumping stations operate to reduce the risk of surface
water flooding, and flooding due to tide-lock.
Historic flood information details one instance of flooding due to surface water in
Stow Hill which is detailed in the table below. This reported flood incident relates
to a storm pumping station issue. There may be other areas of flooding where the
drainage systems cannot cope with high intensity rainfall, or due to blocked
gullies or drains.
Location of Historic Flooding Reason
Kingsway, under Old Green,
Stow Hill
Storm pumping station issue
The table below summarises the impacts of flooding in Stow Hill based on the
Surface Water Flood map, shown below.
52 Stow Hill Ward Profile (2014) Newport city council
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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Table 57 – Flood Risk Map counts for Stow Hill
Totals in
Defined
Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100 to
1 in 1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
5596 28 121 422
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
2412 6 27 84
Essential Services 99 2 4 10
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 503 40 113 184
Primary/Trunk Roads (km) 29.9 1.1 2.8 8.5
Mail Line Railways (km) 3.39 0.50 0.84 1.36
Agricultural Land - Grades 1, 2 and 3 (ha) 131 0 0 0
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 7.09 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI)
(ha) 7.07 0.00 0.00 0.00
Sites of Interest for Nature Conservation
(SINC) (ha) 0.00 0.00 0.00 0.00
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 0.00 0.00 0.00 0.00
Registered Parks and Gardens (ha) 9.86 0.03 0.10 0.39
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 0.10 0.00 0.00 0.01
Listed Buildings (n) 107 1 3 10
Essential Settings of Regional Planning
Guidance (ha) 0.00 0.00 0.00 0.00
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
| Issue | 14 December 2015
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Newport City Council Newport Local Flood Risk Management
Flood Risk Management Plan
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7.20.3 Groundwater
There are no recorded groundwater flood incidents.
7.20.4 Sewer Flooding
There are 10 reported instances of DG5 sewer flooding in this ward.
7.20.5 Measures to reduce local flood risk
The main flood risks are identified as follows:
Queensway / High Street / Cambrian Road / Skinner Street– A number of
properties and highways are predicted at high/medium risk of surface
water flooding in this area. Some property sewer flooding is recorded
locally and the highway is understood to drain to the combined sewer.
Surface water flooding is recorded during an intense rainstorm. The Fire
Service have recorded incidents in the area pumping surface water from
the highway and properties. Investigation into the drainage arrangement
and capacity is ongoing and linked to the redevelopment downstream, with
liaison with DCWW to identify any surface water disconnection
opportunities and monitoring proposed.
Kingsway / Usk Road – The highway underpass (A4042) is predicted at
high risk of surface water flooding. Surface water flooding incidents are
recorded occasionally, linked to operational issues with the Old Green
South storm pumping station. NCC identify the Old Green South storm
pumping station as ‘high risk’ and telemetry is installed. Refurbishment is
ongoing as part of the redevelopment of the area. It is likely that enhanced
highway drainage maintenance will be recommended. Ongoing monitoring
is proposed.
Gaer Street / Cardiff Road – A number of properties and the highway are
predicted at high/medium risk of surface water flooding. No flooding
incidents are recorded. Anecdotal comments suggest that the carriageway
drainage arrangement of a private estate should be reviewed to reduce the
risk of highway ponding. Ongoing monitoring is proposed.
Friars Field – Surface water flooding is predicted adjacent to the hospital.
Although no surface water flooding is recorded by NCC, the Fire Service
have recorded an incident of pumping flooded highways. Investigation
into the drainage arrangement, capacity and exceedance pathways is
proposed with ongoing monitoring.
Cardiff Road / Kingsway – A small number of properties and the highway
are predicted at risk of surface water flooding. The issue is linked and
considered as part of Commercial Road, Pillgwenlly (see Section 7.15.2).
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The following measures are identified to reduce flood risk.
Table 58 – Local Flood Risk Management measures for Stow Hill
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
R1 Queensway / High
Street / Cambrian
Road / Skinner
Street
Investigation into
drainage arrangement
including connection
to combined sewer.
Ongoing 10days FTE
and £8k
survey
M24
R2 Liaison with DCWW
on surface water
disconnection
opportunities
Short term
(0-5years)
N/A
(revenue)
M24, M35
R3 Monitoring Ongoing N/A
(revenue)
M53, M44
R4 Kingsway Surface water
pumping station
refurbishment
Ongoing N/A
(developer)
M24, M35
R5 Monitoring Ongoing N/A
(revenue)
M53, M44
R6 Gaer Street /
Cardiff Road
Review private
highway drainage
arrangement
Short term
(0-5years)
3days FTE
and £2k
survey
M24, M35
R7 Monitoring Ongoing N/A
(revenue)
M53, M44
R8 Friars Field Investigation into
drainage arrangement,
capacity and
exceedance pathways.
Short term
(0-5years)
10days FTE
and £2k
survey
M24, M35
R9 Enhanced highway
drainage maintenance
Short term
(0-5years)
N/A
(revenue)
M35
R10 Monitoring Ongoing N/A
(revenue)
M53, M44
Total (non-revenue) 23days FTE & £12k
Recovery and review Preventing
3 5
4 5
Preparing Protecting
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7.21 Tredegar Park Ward
7.21.1 Overview
Tredegar Park Ward is situated in the central part of NCC, to the south-west of
Central Newport. It has a population of 4,44634 and an area of 1.79km2, which is
approximately 0.8% of the total area of Newport53. Tredegar Park Ward is
relatively flat. It is comprised of residential properties, with several open green
spaces, and an industrial park to the south-west. The Main River Ebbw borders it
in the north and the Main River Pontygwew Reen flows through the north and east
of the ward.
Much of the ward is within the Wentlooge Level drainage district.
7.21.2 Ordinary watercourses and surface water flood risk
The available data indicates that there are also some areas of low risk flooding
associated with ordinary watercourses. Problems may occur in isolated locations,
for example due to culvert restrictions. As many of the ordinary watercourses are
culverted where they pass through developed areas it is difficult to distinguish
between surface water flooding and flooding from ordinary watercourses.
There are no reported instances of historical flooding from ordinary watercourses
in Tredegar Park.
There are three clusters of issues related to surface water flooding in Tredegar
Park however they are generally low risk with small areas of medium and high
risk. The surface water flood maps take a generalised approach to the
representation of drainage systems however the mapping is indicative of areas
most affected during high intensity storms or due to blockages.
A number of surface water pumping stations operate to reduce the risk of surface
water flooding, and flooding due to tide-lock.
There are no reported instances of flooding due to surface water in Tredegar Park.
53 Tredegar Park Ward Profile (2014) Newport city council
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The table below summarises the impacts of flooding in Tredegar Park based on
the Surface Water Flood map, shown below.
Table 59 – Flood Risk Map counts for Tredegar Park
Totals in
Defined
Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100 to
1 in 1000
chance in
any year)
Estimated residents in areas at risk of flooding
depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
4487 0 0 724
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
1934 0 0 148
Essential Services 12 0 0 0
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 9 1 2 13
Primary/Trunk Roads (km) 21.5 0.3 1.4 9.0
Mail Line Railways (km) 1.21 0.00 0.00 0.01
Agricultural Land - Grades 1, 2 and 3 (ha) 180 0 2 17
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 0.00 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI) (ha) 24.34 0.01 0.19 1.06
Sites of Interest for Nature Conservation
(SINC) (ha) 2.48 1.09 1.33 1.60
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 0.00 0.00 0.00 0.00
Registered Parks and Gardens (ha) 0.01 0.00 0.00 0.00
Country Parks (ha) 0.90 0.00 0.01 0.12
Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00
Listed Buildings (n) 0 0 0 0
Essential Settings of Regional Planning
Guidance (ha) 0.00 0.00 0.00 0.00
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
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7.21.3 Groundwater
There are no recorded groundwater flood incidents.
7.21.4 Sewer Flooding
There is one reported instance of DG5 sewer flooding in this ward.
7.21.5 Measures to reduce local flood risk
The main flood risks are identified as follows:
Woodside Estate – a number of properties are predicted at low risk of surface
water flooding however no surface water flooding has been recorded.
Anecdotal comments suggest that there have been issues with fly tipping on
Tredegar Reen causing partial blockages. Liaison with the adjacent school and
community is proposed to explore opportunities for supportive local
monitoring and enhancement of the adjacent open space of centre of Duffryn
Estate, with ongoing monitoring by NCC. The issue is linked to the upstream
Jamaica Close / Dyffryn Drive / Woodside Estate issue (see Section 7.14.5,
Marshfield Ward)
Viscount Evan Drive / Beech Grove – a number of properties and the
carriageway are predicted at low risk of surface water flooding however no
surface water flooding has been recorded. Anecdotal comments suggest
highway gullies blockages may have exacerbated localised ponding and a
review of maintenance is planned. The area is drained by the Pontygwew
Reen and largely within the drainage district. Liaison with NRW and
monitoring is also proposed.
Morgan Way – a small number of properties and the carriageway are predicted
at low risk of surface water flooding however no surface water flooding has
been recorded. Monitoring is proposed.
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The following measures are identified to reduce flood risk.
Table 60 – Local Flood Risk Management measures for Tredegar Park
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
S1 Woodside
Estate
Investigate and establish
local flood action group to
monitor & assist with
debris clearance.
Short term
(0-5)
3days FTE
and £5k
(public
meeting)
M43,
M44
S2 Investigate enhancements
to public open space
adjacent to Reen,
providing additional
attennuation
Short term
(0-5)
10days FTE M43,
M44
S3 Monitor Ongoing N/A M53
S4 Viscount Evan
Drive / Beech
Grove
Review highway drainage
maintenance.
Ongoing N/A
(Revenue)
M35
S5 Partnership working with
NRW wrt Reen
Ongoing N/A
(Revenue)
M35
S6 Monitor Ongoing N/A M53, M44
S7 Morgan Way Monitor Ongoing N/A M53
Total (non-revenue) 3days FTE and £5k
Recovery and review Preventing
3 0
5 2
Preparing Protecting
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7.22 Victoria Ward
7.22.1 Overview
Victoria Ward is situated in the central part of NCC, covering an area of Central
Newport to the south-east. It has a population of 7,44734 and an area of 1.03km2,
which is approximately 0.5% of the total area of Newport54. Victoria Ward is
bordered by the River Usk to the west. The ward is relatively flat and contains a
mix of residential, commercial and industrial developments.
7.22.2 Ordinary watercourses and surface water flood risk
The available data indicates that there are no areas at risk flooding associated with
ordinary watercourses. However, problems may occur in isolated locations, for
example due to culvert restrictions. As many of the ordinary watercourses are
culverted where they pass through developed areas it is difficult to distinguish
between surface water flooding and flooding from ordinary watercourses.
There are no reported instances of historical flooding from ordinary watercourses
in Victoria Ward.
There is one cluster of surface water flooding in Victoria in the centre of the ward
around Chepstow Road area. This area is generally low risk with patches of
medium and high risk potentially affecting properties and the road network. The
surface water flood maps take a generalised approach to the representation of
drainage systems however the mapping is indicative of areas most affected during
high intensity storms or due to blockages.
There are no reported instances of flooding due to surface water in Victoria.
The table below summarises the impacts of flooding in Victoria based on the
Surface Water Flood map, shown below.
54 Victoria Ward Profile (2014) Newport city council
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Table 61 – Flood Risk Map counts for Victoria
Totals in
Defined
Area
Risk Counts
Risk to People and Property
High
(>1 in 30
chance in
any year)
Medium
(1 in 30 to
1 in 100
chance in
any year)
Low
(1 in 100 to
1 in 1000
chance in
any year)
Estimated residents in areas at risk of
flooding depth >0.0m
Estimated People (multiplier 2.32, Newport
average household size 2010)
7280 21 81 2928
Residential Properties at risk of internal
flooding depth >0.2m
Residential Properties
3138 2 23 1075
Essential Services 40 0 0 4
Risk to Economic Activity
Non-Residential Properties in areas at risk of
flooding depth >0.2m 193 3 7 75
Primary/Trunk Roads (km) 18.6 0.6 3.0 11.1
Mail Line Railways (km) 1.05 0.02 0.05 0.06
Agricultural Land - Grades 1, 2 and 3 (ha) 94 0 0 0
Risk to Natural and Historic Environment
Special Areas of Conservation (SAC) (ha) 9.33 0.00 0.00 0.00
Special Protection Areas (SPA) (ha) 0.00 0.00 0.00 0.00
Ramsar Sites (ha) 0.00 0.00 0.00 0.00
Sites of Special Scientific Interest (SSSI)
(ha) 9.33 0.00 0.00 0.00
Sites of Interest for Nature Conservation
(SINC) (ha) 0.00 0.00 0.00 0.00
National Nature Reserves (NNR) (ha) 0.00 0.00 0.00 0.00
Local Nature Reserves (LNR) (ha) 0.00 0.00 0.00 0.00
Ancient Woodland (ha) 0.00 0.00 0.00 0.00
Registered Parks and Gardens (ha) 0.00 0.00 0.00 0.00
Country Parks (ha) 0.00 0.00 0.00 0.00
Scheduled Ancient Monuments (SAM) (ha) 0.00 0.00 0.00 0.00
Listed Buildings (n) 19 0 0 0
Essential Settings of Regional Planning
Guidance (ha) 0.00 0.00 0.00 0.00
RSPB Bird Reserves (ha) 0.00 0.00 0.00 0.00
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7.22.3 Groundwater
There are no recorded groundwater flood incidents.
7.22.4 Sewer Flooding
There is one reported instance of DG5 sewer flooding in this ward.
7.22.5 Measures to reduce local flood risk
The main flood risks are identified as follows:
Bristol Street / Manchester Street / Exeter Street / Livingstone Place /
Hereford Street / London Street / Prince Street - A number of properties,
services, local streets and the B4591 highway are predicted at low/medium
risk of surface water flooding. However no historic surface water flooding
has been recorded and the area is relatively flat and understood to be
drained by the combined sewer network. Sewer flooding is recorded on the
periphery of the area and opportunities for surface water surface
attenuation storage to hold back peak flows should be investigated.
Liaison with DCWW is planned with ongoing monitoring.
Marlborough Road / Methuen Road / Jeffrey Street – As above, a number
of properties and local streets are predicted at low/medium risk of surface
water flooding. No historic surface water flooding has been recorded by
NCC. However the Fire Service records attendance to pump flooded
highways locally and local media report the Rodney Parade stadium was
flooded by heavy rain in 2011. As above, the area is relatively flat and
understood to be drained by the combined sewer network and
opportunities for surface water surface attenuation should be investigated.
Liaison with DCWW is planned with ongoing monitoring. Opportunities
for betterment associated with redevelopment should continue to be
explored.
Lennard Street / Halstead Street / Gordon Street / Phillip Street / Witham
Street / Feering Street / Vivian Road – A large number of properties and
streets are predicted at low risk of surface water flooding, with the B4237
highway railway underpass at high risk. No surface water or sewer
flooding is recorded. As above, the area is relatively flat and understood to
be drained by the combined sewer network and opportunities for surface
water surface attenuation storage to hold back peak flows should be
investigated. Liaison with DCWW is planned with ongoing monitoring.
This is linked to the adjacent Walsall Street / Dudley Street issue (see
Section 7.11.5, Liswerry)
Newport City Council Newport Local Flood Risk Management
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The following measures are identified to reduce flood risk.
Table 62 – Local Flood Risk Management measures for Victoria
Location and
Description
Measure Timescale Indicative
Cost
Strategic
Context
T1 Bristol Street /
Manchester Street /
Exeter Street /
Livingstone Place /
Hereford Street / London
Street / Prince Street
Liaison with
DCWW on surface
water disconnection
opportunities
Short term
(0-5 years)
10days
FTE
M24,
M35
T2 Monitor Ongoing N/A
(Revenue)
M53,
M44
T3 Marlborough Road /
Methuen Road / Jeffrey
Street
Liaison with
DCWW on surface
water disconnection
opportunities
Short term
(0-5 years)
10days
FTE
M24,
M35
T4 Monitor Ongoing N/A
(Revenue)
M53,
M44
T5 Lennard Street / Halstead
Street / Gordon Street /
Phillip Street / Witham
Street / Feering Street /
Vivian Road
Liaison with
DCWW on surface
water disconnection
opportunities
Short term
(0-5 years)
10days
FTE
M24,
M35
T6 Monitor Ongoing N/A
(Revenue)
M53,
M44
Total (non-revenue) 30days FTE
Recovery and review Preventing
3 3
3 3
Preparing Protecting
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8 Implementation and Delivery
8.1 Summary of Measures
Table 63 – Summary of local flood risk management proposed measures across NCC
Ward Total (non-revenue) days
(FTE)
Total (non-revenue)
(£k)
Borough-wide 15 £430k
Allt-yr-Yn 2 £170-360k
Alway 15 £30-57k
Beechwood 13 £25-45k
Bettws 21 £71-212k
Caerleon 25 £70-170k
Gaer 20 £20-33k
Graig 25 £6k
Langstone 15 £60-210k
Liswerry 23 £14-24k
Llanwern 3 £32-52k
Malpas 7 £23-28k
Marshfield 19 £18k
Pillgwenlly 10 £7k
Ringland 19 £19-49k
Rogerstone 8 £16-21k
Shaftesbury 13 £11-16k
St. Julians 23 £11k
Stow Hill 23 £12k
Tredegar Park 3 £5k
Victoria 30
Totals 332 £1,050-1,766k
8.2 Implementation Programme
The programme for delivering the management of local flood risk over the 2015
to 2021 period will be dictated by the specific measures required for undertaking
such management and availability of resources/funding. The detailed programme
of implementation of the specific measures which will be developed in the future
when the measures have been investigated and prioritised.
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8.3 Measure justification
Prioritisation of measures (see Section 4.2) will focus on those issues with a
higher risk or chance of flooding, and those issues impacting on residential
properties.
The standard of service that measures will meet will be determined on their
individual justification, following a risk-based approach to flood risk
management. As a comparison, new residential developments are designed no
property flooding for a 1 in 100 year with allowance for climate change and
sewers are designed for no site flooding in a 1 in 30 annual chance rainfall event.
The approach to justification will be tailored to the identified funder(s)
requirements. For each measure, the benefits (be they tangible or intangible), the
associated costs and the means by which the measures will be funded will need to
be proportionately determined. Details for measures that are not locational
specific such as implementation of awareness campaigns and the provision of
guidance and advice to local communities, business and individuals will be
defined.
8.4 Funding for Local Flood Risk Management
Flood risk management activities in the Borough have primarily been historically
funded through government grants. However moving forwards, a partnership
approach will be required. Implementing the measures will depend on securing
sufficient funding.
Implementing the proposed measures will depend on securing sufficient funding.
Failure to receive additional funding could result in measures identified not being
implemented in part or full, or delayed.
There are local, national and European Union potential funding sources, some
summarised below. These sources could provide either partial funding, match
funding or full funding, and depends upon the nature of the individual scheme.
8.4.1 Public funding
Welsh Government allocates the following grant funding for flood and coastal
erosion risk management in Wales:
Environment & Sustainable Development Grant – Revenue funding to
undertake the requirements of the FWMA. Typically NCC uses this grant to
pay for additional staff resources, maintain the assets register, complete flood
investigations and capacity building. This is not available for capital schemes.
FCERM – (Flood and Coastal Risk Management) Grant in Aid. NCC has no
schemes programmed however is to be replaced by the FIFP and FaCIP.
FIFP – (Flood and Coastal Erosion Innovative Finance Programme)
(programme of up to £150 million capital investment in local authority coastal
flooding and erosion risk management schemes. The programme is about
managing and reducing risks from coastal flooding and erosion and schemes.
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There is also an expectation on the achievement of wider benefits –
community, social, economic, environmental and social.
FIFP Schemes will:
be financed through borrowing, using the Local Government
Borrowing Initiative or Welsh Government’s direct borrowing powers
– options are being considered.
be co-financed, Welsh Government contribution 75% Local
Authorities 25%.
be identified and business cases developed from 2015 onwards.
be expected to start construction in the period 2018-21.
FaCIP – (Flood and Coast Investment Programme) – Welsh Government
recently consulted55 on this proposed method of funding to which NCC
responded. This consultation considered the way that Welsh Government
allocates funding for flood and coastal erosion risk management in Wales and
ensuring it focuses on those places with the greatest risk. The intention is to
create a clear, objective way of directing funds to places at risk from all
sources of flooding and coastal erosion. NCC (like other authorities) is
currently awaiting for further guidance from Welsh Government on this
funding mechanism.
NCC fund culvert inlet grid cleansing works and highway drainage
maintenance under their standard ‘revenue’ works through the task being
completed by NCC’s direct labour organisation. This is not available for
capital schemes.
Glastir is the Welsh Government’s five-year sustainable land management scheme
and is funded by the Rural Development Programme 2014-2020. Financial
support is offered farmers and land managers for the delivery of environmental
outcomes including improved water management to improve water quality and
reduce flood risk, and contributing towards a reversal in the decline of Wales’
native biodiversity. The Welsh Government offers financial support to eligible
landowners directly to fund capital work targeted at specific locations which are
best placed to deliver the environmental aims of Glastir Advanced.
NCC will continue to liaise with NRW and DCWW to identify what, if any, flood
risk management schemes are being implemented by these Risk Management
Authorities, and whether there is an opportunity to work jointly and share the
costs associated with any of the proposed measures.
Local authorities, such as NCC, have the power to borrow money to fund capital
projects through prudential borrowing56.
55 Flood and Coast Investment Programme (FaCIP). Available from:
http://gov.wales/consultations/environmentandcountryside/flood-and-coast-investment-
programme-facip/?lang=en Accessed: 20/08/15. 56 Capital Finance – Welsh Local Government Association. Available from:
http://www.wlga.gov.uk/capital-finance Accessed: 20/08/15.
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European Union funding is also available from the European Regional
Development Fund (ERDF) where flood schemes can contribute to wider
programme objectives. Newport is within the East Wales operational programme.
8.4.2 Private Funding
DCWW invests in flood schemes as part of their duty to remove properties
form the DG5 register (DG5 is a level of service indicator which examines a
water company’s performance in respect of internal sewer flooding of
properties). Sometimes the most effective way to do this is to work in
partnership with risk management authorities on flood schemes in other areas,
which can help reduce surface water pressure downstream. In particular,
DCWW have developed the RainScape57 initiative to focus on managing the
amount of surface water entering their sewers.
Section 106 of the Town and Country Planning Act 1990 allows planning
obligations to be sought for site-specific mitigations and/or contributions.
These should make the development acceptable in planning terms by
enhancing the quality of the development and providing community benefits
or infrastructure facilities. Planning obligation contributions cannot be pooled
from five or more developments to provide infrastructure which could be
funded through CIL.
Community Infrastructure Levy (CIL) – is a new charging mechanism for
securing contributions from developers and is intended to supplement other
public sector revenue streams, to ensure that new community infrastructure
can be provided to keep pace with population grow. It focuses on the
provision of new infrastructure, not remedying pre-existing deficiencies in
infrastructure unless those deficiencies will be made more severe by new
development. The levy can be used to increase the capacity of existing
infrastructure or to repair failing existing infrastructure, if that is necessary to
support development.
NCC recently consulted58 on CIL charging schedule. Importantly the draft
Regulation 123 list states:
Drainage: The Flood & Water Management Act 2010 requires the use of
Sustainable Drainage Systems (SUDS) for surface water drainage in all new
housing and business development. In future, the design of surface water
drainage will need to be consented by a new Sustainable Drainage Approval
Body, prior to development commencing. However, provision has been made
in the Act for details of these schemes to be submitted, via the local planning
authority, as part of the planning application process. Surface water drainage
is an integral part of new development schemes and, as such, direct
provision by the developer is required.
57 DCWW Rainscape Introduction. Available at: http://www.dwrcymru.com/en/My-
Wastewater/RainScape.aspx Accessed on 26/08/15. 58 NCC Planning – Consultations Community Infrastructure Levy – Preliminary Draft Charging
Schedule Stage. Available at: http://www.newport.gov.uk/en/Planning-
Housing/Planning/Consultations/Consultations.aspx Accessed on 26/08/15.
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Where off-site drainage works are required, which are necessary as a
consequence of a new development schemes, these should continue to be
funded by s.106 Obligations. Work to the strategic drainage network will not
be funded by CIL.
Flooding: A significant amount of urban development in the Authority has
taken place alongside rivers, within the river corridor, and often on the Flood
Risk Zone. It is inevitable that some existing development will be vulnerable to
flooding. Where sites are located in the Flood Risk Zone, suitable mitigation
and resilience measures have been agreed with Natural Resources Wales. Any
such measures will be undertaken as an integral part of individual
development schemes and any off- site works will be provided directly via in-
kind contributions, or through s106 obligations. As such, work to flood
defences will not be funded by CIL.
Private and/or community beneficiary contributions - another important
funding mechanism may come in the form of local fundraising from local
communities and businesses that stand to benefit from the proposed flood
schemes.
8.5 Environmental Influences on Measures
8.5.1 Water Framework Directive
Specific measures, particularly structural measures, associated with managing
local flood risk and coastal erosion will have to comply with the requirements of
the WFD (See Section 2.3.5). As part of the on-going liaison between NCC and
Natural Resources Wales, once specific measures are designed, these will be
communicated to NRW for advice. Opportunities to assist the delivery of the
WFD objectives will be sought.
8.5.2 Strategic Environmental Assessment Directive
The LFRMS Strategic Environmental Assessment (SEA) Scoping Report set out
the framework for undertaking further assessments as and when specific measures
– and the strategy itself – are developed further during subsequent stages.
Following on from the Scoping Report, an SEA Report of the LFRMS was
prepared and the conclusions were generally positive. Aligning with the National
Strategy and relevant guidance, there was a clear consideration to integrate
environmental issues and opportunities into the objectives of the LFRMS. Many
of the proposed measures have the potential for direct and indirect environmental
benefits. However, the LFRMS SEA made a number of recommendations to
avoid, reduce or otherwise mitigate the potential for negative effects, and ensure
the potential for positive opportunities were considered.
The recommendations were that the LFRMS should:
Consider flood risk management options that work with natural processes and
provide multiple benefit, for example by working in synergy with the WFD or
environmental enhancement initiatives;
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Be clear that the processes for developing the next stages of flood risk and
coastal erosion planning, appraisals, implementation and construction of
measures will address the potential for environmental effects;
Use the results of the SEA as an initial guide to the above processes.
NCC will rely on the SEA work completed as part of the LFRMS to meet the
‘SEA’ Regulations. In all cases the exact scope of works required for individual
measures is unknown at this stage and further investigation is planned. The ‘SEA’
Regulations require NCC to monitor the significant environmental effects of the
implementation of the plan – with the aim of identifying unforeseen adverse
effects at an early stage and to allow appropriate remedial action to be taken.
8.5.3 Habitats Regulations Assessment
The Habitats Directive offers protection to natural habitat and wild flora and
fauna. The requirements of the Habitats Directive are implemented in Wales by
the Conservation of Habitats and Species Regulations 2010, often referred to as
the Habitats Regulations. The sites that are afforded protection under this
regulation are referred to as Special Areas of Conservation (SAC) and Special
Protection Areas (SPA) in the UK. As a matter of policy, the Welsh Government
and the UK Government have also chosen to apply the same level of protection to
Ramsar sites. Under the regulations, competent authorities are required to
undertake appropriate assessments where a plan or a project is likely to have an
impact on a protected (SAC, SPA and Ramsar) site. Such assessment is referred to
as a Habitats Regulations Assessment (HRA).
There are many protected sites in Newport covering a variety of habitats59.
Specific measures may be subject to a Habitats Regulations Assessment. The need
for such an assessment will depend upon the type of measure proposed to be
implemented. For instance, a non-structural measure which involves raising flood
risk awareness by holding community engagement exercises will not be subject to
this assessment. However, a structural measure which involves constructing a
flood scheme will be subject to this assessment. The assessment, if required, will
be undertaken in the following four stages.
Stage 1 – Screening - assesses the likely impact of the project, either alone or
in combination with other plans and projects, on a protected site. The
screening process also assesses the significance of the likely impacts.
Stage 2 – Appropriate Assessment - considers the impact of the proposed
project on the integrity of the protected site in relation to its conservation
objectives and its functions. If any adverse impact is identified, then
mitigation measures need to be considered. If the mitigation measures cannot
avoid the adverse impact on the protected site, then consent for the project can
only be granted provided that Stages 3 and 4 are followed.
59 International and National Protected Sites are listed. Available at:
http://www.newport.gov.uk/en/Leisure-Tourism/Countryside--Parks/Biodiversity/Protected-
sites.aspx Accessed 4/10/15
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Stage 3 – Assessment of Alternative Solutions - determines if it is possible to
achieve the objectives of the proposed project by considering alternative
solutions which will have lesser impact on the protected site.
Stage 4 – Imperative Reasons for Over-riding Public Interest (IROPI) - If the
adverse impacts associated with the proposed project cannot be mitigated,
then a Stage 4 assessment is undertaken. If this assessment concludes that the
proposed project should proceed, then compensatory measures, which
maintain the overall coherence of the site, will need to be secured. The
national government will need to be consulted prior to the implementation of
the project. In addition, the Secretary of State for Communities and the local
government will need to inform the EC about the compensatory measures
secured as part of the process.
If the Habitats Regulation Assessment concludes that a certain specific measure
will impact on a protected site, then in addition to a full Habitats Assessment, an
Environmental Assessment will also be undertaken.
Given the requirement to demonstrate wider environmental benefits, measures
that have significant adverse environmental impacts are unlikely to be viewed
positively by the public, the Risk Management Authorities and the Welsh
Government who will need to approve the plan. However, if a particular measure
demonstrates greater benefits for the local community and local businesses, then it
may be possible to justify the adverse environmental impact.
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9 Public Consultation
Successful management of flood risk relies on having a two way dialogue with
those affected by flooding and at potential risk of flooding. It is important to
enhance their understanding of the risk and increase awareness. At the same time
it is important to understand what is important to them so that measures can be
implemented which prioritise the needs of the community.
The LFRMS preparation included two phases of consultation. An initial public
consultation was undertaken by NCC during November-December 2012 to
understand the views of the residents, businesses and other organisations in
Newport on local flood risk, and help shape the strategy. The LFRMS was drafted
following the initial consultation, and was subjected to a public consultation
during January and February 2013. In addition, NRW, the then Caldicot and
Wentlooge Levels IDB, DCWW and the Welsh Government were also invited to
comment on the draft.
9.1 Consultation on the Draft Local Flood Risk
Management Plan
The draft FRMP will be published in advance of a four-week consultation period
between December 2015 and January 2016, and hosted on the NCC website. The
consultation will include:
Key partners and elected representatives (see Section 4.3)
Residents and businesses in Newport.
A questionnaire will be prepared by NCC and made available to enable residents
and businesses in Newport to provide feedback and comment on the draft FRMP.
Provisions will be made to allow the responses to be received online via the NCC
website and on paper copies posted to NCC offices. NCC will support this by
raising awareness of the consultation using their media channels.
The following questions will be used as prompts:
Question 1 - Do you agree this draft plan sets out the most important issues
with surface water, ordinary watercourses and groundwater flood risk for your
area? If not, please explain what is missing.
Question 2 - What do you consider to be the highest priorities for managing
the risk of flooding in Newport?
Question 3 - This draft plan proposes measures to manage flood risk through
prevention, preparation, protection and recovery/review. Is the balance
between these different types of proposed approaches in the draft plan right? If
not, which proposed measures would you change, and why?
Question 4 – Do you agree with the proposed Borough-wide measures (See
Section 7.2)? Are there other proposed measures that should be included?
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Question 5 – Are there other proposed local ward measures that should be
included (See Section 7.3 to Section 7.22)? If yes, please explain what they
are and why they should be included.
Question 6 - How can you support the work set out in the draft flood risk
management plan to reduce flood risk?
Question 7 – Do you have any further comments?
Once complete, we will collate the comments received (personal information will
be removed), explain how we have taken them into account and what changes will
be made before the FRMP is finalised. NCC will seek Cabinet approval for the
final FRMP, prior to submission to Welsh Government in February 2016.
9.2 Further Consultation
Additional public consultation(s) will be undertaken when specific measures for
mitigating local flood risk are developed during subsequent stages. These are
likely to be held within the communities where such specific measures are
proposed to be implemented.
As part of their LFMRS, NCC will also undertake appropriate exercises to
increase flood risk awareness across Newport and provide further guidance and
information on managing such risk and minimising damage.
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10 Monitoring and review
The National Strategy will be formally reviewed on a six-yearly cycle, mirroring
the requirements of the Flood Risk Regulations 2009. This will enable the Welsh
Government to consider the information being produced from the mapping and
planning exercises that the NRW and LLFA complete. This information will also
inform LFRMSs and NCC will review their LFRMS every 6 years, the first being
in 2017 to coincide with the formal review of the National FCERM Strategy.
The measures and delivery programme will be reviewed annually, with a full
review completed by December 2021. Subsequent reviews will be carried out at 6
year intervals. The adhoc addition of measures will be considered, if the need for
emergency works is identified.
References
National strategy for flood and coastal erosion risk management
Newport City Council Preliminary Flood Risk Assessment
Newport City Council Local Flood Risk Management Strategy
Appendices
Appendix A
Historic Local Flood Events
Newport City Council Newport Local Flood Risk Management
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A1 Preliminary Flood Risk Assessment Historic
Flooding
Annex 1 of the Newport Preliminary Flood Risk Assessment is reproduced below.
Annex 1 Past floods
Records of past floods and their significant consequences (preliminary assessment report spreadsheet)
Flood ID Summary description Name of Location National Grid
Reference
Location Description Start date Days duration Probability Main source of flooding Additional source(s)
of flooding
Confidence in main
source of flooding
Main mechanism of
flooding
Main characteristic of
flooding
Significant
consequences to
human health
Human health
consequences -
residential properties
Property count method Significant economic
consequences
Number of non-
residential properties
flooded
Significant
consequences to the
environment
Significant
consequences to
cultural heritage
Data owner Flood event outline
confidence
Mandatory Mandatory Mandatory Mandatory Optional Optional for first cycle Optional for first cycle Optional for first cycle Optional for first cycle Optional Optional Optional for first cycle Optional for first cycle Mandatory Optional Optional Mandatory Optional Mandatory Mandatory Optional Optional
Unique number
between 1-9999
Max 5,000 characters Max 250 characters 12 characters: 2
letters, 10 numbers
Max 250 characters 'yyyy' or 'yyyy-mm' or
'yyyy-mm-dd'
Number with two
decimal places
Max 25 characters Pick from drop-down Max 250 characters,
same source terms
Pick from drop-down Pick from drop-down Pick from drop-down Pick from drop-down Number between 1-
10,000,000
Pick from drop-down Pick from drop-down Number between 1-
10,000,000
Pick from drop-down Pick from drop-down Max 250 characters Pick from drop-down
A sequential number
starting at 1 and
incrementing by 1 for
each record.
Description of the flood and its adverse or potentially adverse consequences. Where
available, information from other fields (Start date, Days duration, Probability, Main source,
Main mechanism, Main characteristics, Significant consequences) should be repeated here.
Name of the locality
associated with the
flood, using recognised
postal address names
such as streets, towns,
counties. If the flood
affected the whole
LLFA, then record the
name of the LLFA.
National Grid
Reference of the
centroid (centre point,
falls within polygon) of
the flood extent, or of
the area affected if
there is no extent
information.
A description of the
general location that
was flooded.
The date when the
flood commenced -
when land not normally
covered by water
became covered by
water.
The number of days
(duration) of the flood -
that land not normally
covered by water was
covered by water.
Values should be
within the range 0.01 -
999.99 (permitting
records to the nearest
quarter of an hour,
where appropriate).
The chance of the
flood occuring in any
given year - record X
from "a 1 in X chance
of occurring in any
given year". Where this
is difficult to estimate,
a range can be
recorded.
Pick the source from
which the majority of
flooding occurred.
Refer to the PFRA
guidance for definitions
of sources.
If flooding occurred
from, or interacted
with, any other sources
(other than the Main
source of flooding),
report the source(s)
here, using the same
source terms.
Pick a broad level of
confidence in the Main
source of flooding
from; 'High'
(compelling evidence
of source - about 80%
confident that source is
correct), 'Medium'
(some evidence of
source but not
compelling - about
50% confident that
source is correct) 'Low'
(source assumed -
about 20% confident
that source is correct)
or 'Unknown'.
Pick a mechanism
from; 'Natural
exceedance' (of
capacity), 'Defence
exceedance'
(floodwater overtopping
defences), 'Failure' (of
natural or artificial
defences or
infrastructure, or of
pumping), 'Blockage or
restriction' (natural or
artificial blockage or
restriction of a
conveyance channel or
system), or 'No data'.
Pick a characteristic
from; 'Flash flood'
(rises and falls quite
rapidly with little or no
advance warning),
'Natural flood' (due to
significant
precipitation, at a
slower rate than a flash
flood), 'Snow melt
flood' (due to rapid
snow melt), 'Debris
flow' (conveying a high
degree of debris), or
'No data'. Most UK
floods are 'Natural
floods'.
Were there any
significant
consequences to
human health when the
flood occurred, or
would there be if it
were to re-occur?
Record the number of
residential properties
where the building
structure was affected
either internally or
externally by the flood,
or that would be so
affected if the flood
were to re-occur.
Where residential or
non-residential
properties have been
counted, it is important
to record the method of
counting, to aid
comparisons between
counts. Choose from;
'Detailed GIS' (using
property outlines, as
per Environment
Agency guidance),
'Simple GIS' (using
property points),
'Estimate from map', or
'Observed number'.
Were there any
significant economic
consequences when
the flood occurred, or
would there be if it
were to re-occur?
Record the number of
non-residential
properties where the
building structure was
affected either
internally or externally
by the flood, or that
would be so affected if
the flood were to re-
occur.
Were there any
significant
consequences to the
environment when the
flood occurred, or
would there be if it
were to re-occur?
Were there any
significant
consequences to
cultural heritage when
the flood occurred, or
would there be if it
were to re-occur?
Choose from; 'High'
(data includes one of:
Aerial video, Aerial
photos, Professional
survey, Flood level
information, EA flood
data recording staff
notes), 'Medium' (data
includes one of: EA/LA
ground video, EA/LA
ground photos, EA/LA
flood event outline
map, LA/professional
partner officer site
records, Public ground
video), 'Low' (not
confident) or
'Unknown'.
3 Properties flooded at Forge Farm Lane due to a blocked trash screen Ford Farm Lane ST 38335 90181 approx. 2002 0.5 unknown Ordinary watercourses Medium Blockage or restriction Natural flood No 2 or 3 Observed number No No No Newport City Council High
4 Surface water flooding caused by blocked trash screen and collapsed pipe Springfield, Rhiwderin ST 25878 87512 No No No No Newport City Council High-Medium
5 Surface water flooding caused by hydraulic overload of combined sewer Orchard Street ST 31836 89406 No No No No Newport City Council High
6 Surface water flooding caused by hydraulic overload Bank Street ST 31963 89750 No No No No Newport City Council High
7 Surface water flooding caused by blocked trash screen Ringland Circle ST 34879 88026 Ringland Circle Ordinary watercourses Medium Blockage or restriction Natural flood No 28 Observed number No No No Newport City Council High-Medium
8 Surface water flooding Llanwern Road ST 35331 89121 Ordinary watercourses Medium Blockage or restriction Natural flood No 8 Observed number No No No Newport City Council High-Medium
9 Surface water flooding Anson Green ST 35322 89255 No 3 Observed number No No No Newport City Council High-Medium
10 Surface water flooding Roman Way ST 32910 91493 No No No No Newport City Council High-Medium
11 Surface water flooding St Cadocs Close ST 32910 91493 approx.1998 Ordinary watercourses Medium Natural exceedance Natural flood No 8 Observed number No No No Newport City Council High-Medium
12 Surface water flooding Bellin Close ST 33234 91537 Ordinary watercourses Medium Natural exceedance Natural flood No 4 Observed number No No No Newport City Council High
13 Surface water flooding caused by Lotteries Reen overflowing Orchard Street ST 31836 89406 Ordinary watercourses Medium Natural exceedance Natural flood No 16 Observed number No No No Newport City Council High-Medium
14 Surface water flooding caused by Tredegar Reen overflowing Woodside ST 29063 85406 Duffryn Ordinary watercourses Medium Natural exceedance Natural flood No 10 (Elderly persons
complex)
Estimate from map No No No Newport City Council High
15 Surface water flooding Ffos-y-Fran ST 26797 86988 Bassaleg Ordinary watercourses Medium Natural exceedance Natural flood No 4 Estimate from map No No No Newport City Council High
16 Surface water flooding caused by Monks Ditch overflowing Station Road ST 36560 87808 Llanwern Main rivers Ordinary watercourses Medium Natural exceedance Natural flood No Observed number No No No Newport City Council High
17 Surface water flooding St Albans Cottage, St
Mellons Road
ST 25858 81993 Marshfield Ordinary watercourses Medium Natural exceedance Natural flood No 1 Observed number No No No Newport City Council High
18 Surface Water flooding The Uplands,
Rogerstone
ST 26661 88829 Rogerstone Ordinary watercourses Medium Natural exceedance Natural flood No 3 Observed number No No No Newport City Council High
100-120 Main rivers High-Medium
09/07/1997 0.5 1601 Rainfall of 46mm recorded in Newport between 18:00 and 18:45 on 9/7/97 caused extensive
surface water flooding in and around the the centre of Newport. The Met Office considered
this a very rare event occurring once every 160 years. It was confined to a relatively small
area and associated with a thunderstorm.
Newport City Centre
and surrounding
streets.
ST 3099888240 Flash flood Yes UnknownSurface runoff High-Medium Natural exceedance No NoNo Unknown Newport City Council
2 between 28th-30th October 2000 100mm of rainfall had been measured in the Newport area.
This led to flooding throughout the town and in partcular at Goodrich Crescent and Gaer
Vale.
Goodrich Crescent ST 30592 89347 Goodrich Crescent and
surrounding area
30/10/2000 1 Observed number NoDefence exceedance Natural flood Yes 50-60 No Newport City CouncilNo High
Newport City Council Newport Local Flood Risk Management
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A2 Recent Historic Flooding
Supplementary records from NewportCC of local flooding incidents that have
occurred since preparation of the PFRA (April 2011) is recorded below.
Recent Past floods
Records of past floods and their significant consequences (preliminary assessment report spreadsheet)
Flood ID Summary description Name of Location National Grid
Reference
Location Description Start date Days duration Probability Main source of
flooding
Additional source(s)
of flooding
Confidence in main
source of flooding
Main mechanism of
flooding
Main characteristic of
flooding
Significant
consequences to
human health
Human health
consequences -
residential properties
Property count method Significant
economic
consequences
Number of non-
residential properties
flooded
Property count method Other economic
consequences
Environment
consequences
Data owner Flood event outline
confidence
Mandatory Mandatory Mandatory Mandatory Optional Optional for first cycle Optional for first cycle Optional for first cycle Optional for first cycle Optional Optional Optional for first cycle Optional for first cycle Mandatory Optional Optional Mandatory Optional Optional Optional Optional Optional Optional
1 Surface Water Flooding (Flash Flood)/WW sewer flooding; 8 Residential Larch Grove, Malpas 22/05/2014 Surface runoff DCWW sewer
flooding
High-Medium No data 8 Observed number No
2 Surface Water Flooding (Flash Flood); 3 Residential Almond Drive, Malpas 22/05/2014 Surface runoff High-Medium No data 3 Observed number No
3Surface Water Flooding (Flash Flood); 2 Residential (2 gardens)
Llanover Close,
Malpas
22/05/2014 Surface runoff High-Medium No data 2 Observed number No 2 Gardens
4 Surface Water Flooding (Flash Flood)/culvert flooding; 2 Residential Wavell Drive, Malpas 22/05/2014 Surface runoff Culvert flooding High-Medium No data 2 Observed number No
5Surface Water Flooding (Flash Flood)/WW sewer flooding; 2 Residential
Old Malpas Road,
Malpas
22/05/2014 Surface runoff DCWW sewer
flooding
High-Medium No data 2 Observed number No
6Surface Water Flooding (Flash Flood)/WW sewer flooding; 1 Residential
Bryn Bevan,
Shaftesbury
22/05/2014 Surface runoff DCWW sewer
flooding
High-Medium No data 1 Observed number No
7 Surface Water Flooding (Flash Flood)/private sewer flooding; 1 Residential Meon Close, Bettws 22/05/2014 Surface runoff Private sewer flooding High-Medium No data 1 Observed number No
8Surface Water Flooding (Flash Flood)/culvert flooding; 2 Residential
The Uplands,
Rogerstone
22/05/2014 Surface runoff Culvert flooding High-Medium No data 2 Observed number No
9Surface Water Flooding (Flash Flood); 1 Residential
Nantymor Cottages,
Coedkernew
22/05/2014 Surface runoff High-Medium No data 1 Observed number No
10Surface Water Flooding (Flash Flood)/sewer flooding; 1 Residential
Church Crescent,
Bassaleg
22/05/2014 Surface runoff Sewer flooding High-Medium No data 1 Observed number No
11Surface Water Flooding (Flash Flood); 1 Residential
Ashwell Cottages,
Caerleon
22/05/2014 Surface runoff High-Medium No data 1 Observed number No
12Surface Water Flooding (Flash Flood)/WW sewer flooding; 2 Residential (1 house, 1 garden)
Caerleon Road, St
Julians
22/05/2014 Surface runoff DCWW sewer
flooding
High-Medium No data 2 Observed number No 1 Garden
13Surface Water Flooding (Flash Flood)/culvert flooding; 1 Residential, 2 Commercial
Orchard Street, St
Julians
22/05/2014 Surface runoff Culvert flooding High-Medium No data 1 Observed number No 2 Observed number
14Surface Water Flooding (Flash Flood); 2 Residential
Christchurch Road,
Beechwood
22/05/2014 Surface runoff High-Medium No data 2 Observed number No
15Surface Water Flooding (Flash Flood); 1 Residential
Heather Road,
Beechwood
22/05/2014 Surface runoff High-Medium No data 1 Observed number No
16Surface Water Flooding (Flash Flood); 1 Residential
Woodland Road,
Beechwood
22/05/2014 Surface runoff High-Medium No data 1 Observed number No
17Surface Water Flooding/culvert flooding; 1 Residential, 1 Commercial
A48 Chepstow Rd,
Langstone
Recurring Surface runoff Culvert flooding High-Medium No data 1 Observed number No 1 Observed number
18
Surface Water Flooding/culvert flooding; Highway
Bishton Rd, between
Waltwood Rd and
Bishton
Recurring Surface runoff Culvert flooding High-Medium No data Highway
19Surface Water Flooding/culvert flooding; Highway
Magor Road, nr j/w
Waltwood Rd
Recurring Surface runoff Culvert flooding High-Medium No data Highway
20Surface Water Flooding/culvert flooding; Highway
Llanthewy Rd j/w
Bryngwyn Rd
Rarely now Surface runoff Culvert flooding High-Medium No data Highway
21Surface Water Flooding/culvert flooding; Residential
Station Road,
Llanwern Village
Rarely now Surface runoff Culvert flooding High-Medium No data Unknown
22Surface Water Flooding/culvert flooding; Highway
Lanstone Lane,
Lanwern Village
Recurring Surface runoff Culvert flooding High-Medium No data Highway
23Surface Water Flooding/culvert flooding; Residential (garden)
Pye Corner,
Rogerstone
Recurring Surface runoff Culvert flooding High-Medium No data Unknown Garden
24Welsh Water sewer issue; Highway
Stephenson St, under
Rail Bridge, Liswerry
Occassionally Surface runoff DCWW sewer
flooding
High-Medium No data Highway
25Storm pumping station issue; Highway
Docks Way, under
Rail Bridge, Maesglas
Occassionally Surface runoff Storm pumping station High-Medium No data Highway
26Storm pumping station issue; Highway
Kingsway, under Old
Green, Stow Hill
Occassionally Surface runoff Storm pumping station High-Medium No data Highway
27 Storm Water system issue; Cemetery St Woolos Cemetery Unknown Surface runoff High-Medium No data Cemetery Cemetery
Newport City Council Newport Local Flood Risk Management
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Page A3
A3 Additional Flooding Incidents
Records from South Wales Fire and Rescue of flooding incidents during the
period June 2009 and June 2015 have been used to supplement incident
information. A total of 119 incidents occurred during this period.