Hampshire Avon EA CIP

Hampshire Avon Operational Catchment 1

Catchment Information Pack (CIP)

Hampshire Avon Operational

Catchment

Author: Wessex Area Environment Programme Delivery Team

16 September 2013


We are the Environment Agency. We protect and improve the environment and make it a

better place for people and wildlife.

We operate at the place where environmental change has its greatest impact on people’s

lives. We reduce the risks to people and properties from flooding; make sure there is

enough water for people and wildlife; protect and improve air, land and water quality and

apply the environmental standards within which industry can operate.

Acting to reduce climate change and helping people and wildlife adapt to its

consequences are at the heart of all that we do.

We cannot do this alone. We work closely with a wide range of partners including

government, business, local authorities, other agencies, civil society groups and the

communities we serve.


Foreword

Waterbody Information Packs (WIPs) and associated Action Plans were introduced by the

Environment Planning Team to look at priority waterbodies that were scheduled for delivery by 2015

in the first River Basin Management Plan. They have provided a basis for identifying measures to

deliver Good Ecological Status in our target waterbodies.

In light of our experience with this way of working and in accordance with guidance from DEFRA and

the Environment Agency, it has been decided that we should look at improvements for Water

Framework Directive in the next cycle on a catchment wide scale with particular reference to

working in partnership with other organizations where this can help deliver the required outcomes.

The Wessex Area has been subdivided into 12 Operational Catchments. The table below shows each

Operational catchment along with the number of waterbodies and Artificial or Heavily Modified

Water Bodies (A/HMWB) they contain. A map depicting the Wessex Operational Catchments is

shown in Figure 1.

Wessex Operational Catchments

Operational Catchment Number of Waterbodies (Rivers)

Bristol Avon – Urban 12 (10 A/HMWB)

Bristol Avon – Rural 93 (7 A/HMWB)

Brue & Axe 23 (12 A/HMWB)

Dorset Stour 46 (5 A/HMWB)

Frome & Piddle and Poole and Purbeck 34 (8 A/HMWB)

Hampshire Avon 39 (5 A/HMWB)

Lower Severn Vale 12 (4 A/HMWB)

North Somerset Streams 13 (11 A/HMWB)

River Parrett 60 (20 A/HMWB)

River Tone 15 (3 A/HMWB)

West Dorset 22 (2 A/HMWB)

West Somerset Streams 23 (2 A/HMWB)


Figure 1. Map Depicting DEFRA Management Catchments & Operational Catchments in Wessex


Figure 2. Operational Catchment and Apportionment of ‘Tier 1’ Reasons for Failure (RFF)


1. Summary of Catchment Data

Table 1.1 Summary of Catchment Data

Rivers

Transitional and

Coastal Waters

(TraC)

Groundwater Lakes

Total Number of Waterbodies

39 1 3 11

Good Status at Baseline (2009)

10 1 2 4

% of Total 26 100 67 36.4

Moderate Status at Baseline (2009)

23 N/A N/A 6

% of Total 59 N/A N/A 54.5

Poor Status at Baseline (2009)

6 N/A 1 1

% of Total 15 N/A 33 9.1

Bad Status at Baseline (2009)

N/A N/A N/A N/A

% of Total N/A N/A N/A N/A

Table 1.1 shows that only 26% of the river waterbodies within the catchment achieved the required Good

Ecological Status in the baseline year (2009).

The significant reasons for failure (known as ‘Tier 1’ RFF) in Hampshire Avon Catchment are diffuse pollution

from agricultural sources, point source pollution from Water Industry, and physical modification, the

apportionment of each is shown graphically in Figure 2 and the location of each in Figures 3, 4 and 5. The

more specific reasons for failure (known as ‘Tier 2’ RFF) within Point Source, Diffuse Source and Physical

Modification categories are shown in Figures 3, 4 and 5. The proportions within pie charts shown in figures

2,3,4, and 5 represent the percentage of recorded reasons for failure. It is important to note that there can

be multiple reasons for failure per waterbody.


The Environment Agency is already working with the Water Company to improve discharges from Sewage

Treatment Works and industry but this has to be balanced with costs to customers for water supply and

sewage disposal.

The hardest issues to resolve stem from diffuse run-off from agricultural land. Fine solids running off land

can carry an excess of nutrients that cause an imbalance in the river and lead to algal blooms and water

quality problems. Too much sediment can also settle in the gravel stopping fish eggs from hatching by

preventing a good flow of oxygen.


Figure 3. Map showing Location of Point Source Reasons for Failure and ‘Tier 2 RFF’ Apportionment


Figure 4. Map showing Location of Diffuse Source Reasons for Failure and ‘Tier 2 RFF’ Apportionment


Figure 5. Map showing Location of Physical Modification Reasons for Failure and ‘Tier 2 RFF’ Apportionment


2. Catchment Overview

2.1 Executive Summary of Current Actions

Scope delivery of schemes to modify physical barriers and allow fish passage

Work with partners and the agricultural community to resolve diffuse pollution problems

Work with Water Company through periodic review to resolve sewage issues

Work with industry to ensure permits are fit for purpose and discharges are compliant

2.2 Brief Description of Catchment

The Hampshire Avon rises in the Vale of Pewsey to the north of Salisbury and then flows south towards Christchurch

Harbour and Christchurch Bay on the south coast. The water bodies within this Operational Catchment contain

significant baseflow from groundwater within the chalk aquifers underlying Salisbury Plain. At Salisbury, the Avon is

joined by two of its major tributaries - the Rivers Bourne and Nadder (including the River Wylye), and a short distance

downstream by the River Ebble. The overall catchment area is about 1,750 square kilometres, and has a population of

around 230,000. Only two per cent of the catchment is urbanised. As well as Salisbury and Christchurch, the urban

areas include Warminster. The Hampshire Avon catchment is characterised by open chalk downland with steep scarp

slopes, sheltered valleys, chalk hills, ridges and limestone plateaux. Variations in the topography have a strong

influence on the rivers’ response to rainfall. The upper Avon catchment is typified by undulating chalk downlands on

Salisbury Plain, which are cut by steep combes and river valleys. The lower catchment is characterised by rolling

farmland and the New Forest. The main watercourses have wide floodplains and flow through farmland, woodland,

scrub and open heathland. There are a number of reservoirs in the Ibsley area, created by backfilling previous gravel

extraction pits. They are used for potable water supply and recreation.

2.3 Setting

The River Avon is one of the most important river systems in the UK, supporting internationally and nationally

important habitats and species. Within the Hampshire Avon catchment there are a number of sites designated for

their environmental importance including part of the New Forest National Park and the World Heritage Site of

Stonehenge. Important environmental sites in the catchment include two Areas of Outstanding Natural Beauty, two

Environmentally Sensitive Areas, nine Special Areas of Conservation (SAC), six National Nature Reserves, 71 Sites of

Special Scientific Interest (SSSIs) and 1,061 Scheduled Monuments. The river itself is designated as the River Avon

System Site of Special Scientific Interest. The SSSI covers the River Avon, its major tributaries and parts of the

floodplain. The River Till, a tributary of the River Wylye is also designated as a separate SSSI. The river system is richer

and more varied than most rivers in the UK with over 180 species of river plant, one of the most diverse fish


populations in Britain and a wide range of river invertebrates. Habitats associated with the river include swamp, wet

woodland and wet grassland habitats. These floodplain habitats would once have dominated the Upper Avon.

The River Avon System SSSI and River Till SSSI are also designated internationally through the Habitats Directive as a

Special Area of Conservation (SAC). The SAC supports internationally rare and threatened species. The lower reaches

of the River Avon and it’s floodplain, one of the largest expanses of unimproved floodplain grazing marsh in Britain, is

designated as the Avon Valley (Bickton to Christchurch) SSSI, Ramsar site and Special Protection Area (SPA). It supports

a complex mosaic of wetland habitats including fens, mires, wet grassland, wet woodland and unimproved floodplain

grassland. Important species include populations of breeding and over-wintering wetland birds and rare wetland

plants and insects. The River Avon and its tributaries have been shaped and influenced by a long history of human use.

It’s many and diverse uses continue to influence management of the Avon and are integral to the landscape, heritage,

social and economic value of the river.

The water in the catchment is used by many and supports a variety of different uses. It provides drinking water, is

used in sewage treatment, recreationally for walking, fishing and other pastimes, as well as being used by local

business and industry.


2.4 Statutory Designations

Table 2. Statutory Designations within the Catchment

Statutory Designations Location/Description

Special area of Conservation (SAC) River Avon System, River Till

Special Protection Area (SPA) Avon Valley

Sites of Specific Interest (SSSI) River Avon System, Avon Valley, River Till

Ramsar Avon Valley

Area of Outstanding Beauty (AONB) and an

Environmentally Sensitive Area Cranbourne Chase & West Wiltshire Downs AONB

EC Bathing Waters Directive Friars Cliff, Highcliffe, Mudeford Sandbank, Avon Beach

EU Freshwater Fish Directive 68 Salmonid waters (385km)

Urban Waste Water Treatment Directive Salisbury, Ringwood, Fordingbridge STW

Other Protected Sites Location/Description

National Character Area Salisbury Plain & West Wiltshire Downs

Source Protection Zones and Groundwater Vulnerability

Zones Across catchment

Nitrate Vulnerability Zones

With the exception of the Nadder and Sem, the whole

catchment is covered by Nitrate Vulnerability Zones

(NVZs).


2.5 Regulated Sites

There are 1321 consented discharges in the Operational Catchment. These are for private discharges, water

companies, trade and agriculture. The largest discharges are for fish farms, watercress farms and Sewage Treatment

Works (there are 42 of these in the catchment).

There are 708 abstractions in the catchment. These include several for public water supply and large abstractions for

fish farms and watercress beds.

There are a number of public water supply reservoirs within the catchment, mainly at Ibsley and Blashford Lakes.

There are 33 sites issued with Pollution Prevention Control (PPC) permits under the Integrated Pollution Prevention

and Control (IPPC) Directive.

Since 1997 the water company has reduced their total load of phosphate to the river by 80%. This was delivered

though the phosphate stripping schemes in the Asset Management Plans AMP3 and AMP4. These schemes were

required to meet the needs of the Urban Waste Water Treatment Directive, Habitats Directive and the CROW Act

(SSSIs). Further reductions are proposed for AMP6 (2014). Wessex Water’s investment in treatment processes for

Phosphorus removal at these 17 STWs discharging into the Hampshire Avon amounts to £30 million. The additional

annual operating cost for Phosphorus removal at these sites amounts to over £2million/year.

Figure 6. below shows consented discharges in the Hampshire Avon catchment. These have been separated for water

companies, private and trade/agriculture. The paragraphs below explain the types of flow used to describe the volume

of consented discharges. An explanation of dry weather flow and maximum flow discharge consents is explained

below:

Dry Weather Flow (DWF) The quantity of sewage arriving at most Sewage Treatment Works (STW) increases

considerably in response to rainfall even though the amount of actual sewage has not changed. In the permit we set a

maximum limit on the amount of treated sewage discharged in ‘dry weather’, and we call this the ‘Dry Weather Flow’

(DWF). The DWF will include domestic sewage, discharges to sewer from traders, and infiltration. Infiltration is water

that gets into the sewers through cracks and breaks in the pipes. The DWF is normally measured in cubic metres per

day (m3/d).

Maximum Daily Flow (MDF) For most private discharges of sewage (e.g. caravan sites), rainfall does not influence the

flow of sewage. In these circumstances, we do set maximum limits on the amount of sewage that can be discharged

each day. This is referred to as the ‘Maximum Daily Flow’ which is also measured in m3/d.


Figure 6. Map showing Consented Discharges for Water Companies, Trade/Agriculture & Private


2.6 Surface Water Issues

The waterbodies in the Hampshire Avon Catchment meet a mixture of Good, Moderate and Poor Ecological Status in

the 2009 classification (shown in Figure 6).

Waterbodies such as The Upper Hampshire Avon, Upper Ebble, Fonthill Steam, Till, Chitterne Brook, Lower Nadder,

Sweatford Water, Ashford Water and Sleep Brook, all meet Good Ecological Status.

The Hampshire Avon East, Upper and Middle Nadder, Wylye, Ditchend Brook, Huckles Brook, Etchilhampton water

and Mude all meet Moderate Ecological Status requirements.

The Lower and West Hampshire Avon, Deane Water, Bourne, Dockens Water, Linford brook and Ripley Brook, are at

Poor Ecological Status.

There has been some improvement to several the waterbodies in the 2013 classification. Deane Water, Nine Mile

River, Dockens Water and Linford Brook, have been reclassified from Poor Status in 2009 to Moderate Status in

2013. However, there has also been some deterioration, for example, some of the Nadder tributaries, have declined

from Moderate Ecological Status in 2009 to Poor Ecological Status in 2013 and Chitterne Brook, which was at Good

Ecological Status in 2009 is classified as being at Bad Ecological Status in 2013.

The majority of waterbodies not meeting Good Ecological Status are failing for Water Framework Directive elements

such as, phosphate and fish, the reasons for these failures are detailed in the ‘Summary of Reasons for Failure in the

Catchment’ (Table 5).


Figure 7. Map for Hampshire Avon showing Broad Soil Landscapes and their inherent risk of enhanced run-off due to agriculture.


Figure 8. Map showing Ecological Status 2009

Figure 9. Map showing Ecological Status 2013


2.7 Groundwater Issues

There are three groundwater bodies that underlie the Hampshire Avon Catchment Operational Catchment, the

majority of the Northern half of the catchment is underlain by the ‘Upper Hampshire Avon’ groundwater body, this

groundwater has been classified as being at Poor Quantitative Status and Poor Qualitative Status (overall Poor

Status) in 2009 and 2012, with Rising Chemical Trends for Nitrates (Drinking Water Protected Area) and Phosphate

(Impact on surface waters). The Groundwater Body is also at risk of failure with a rising trend for Nitrates and Zinc.

Beneath the southern half of the Hampshire Avon Catchment, is the ‘Lower Dorset Stour and Lower Hampshire

Avon’ groundwater body this has been classified as being at Good Quantitative Status and Poor Qualitative Status,

(overall Poor Status) in both 2009 and 2012. The ‘Reading Beds’ groundwater body, also to the South of the

catchment, is classified as being at Good Quantitative and Good Qualitative Status (overall Good Status) in both 2009

and 2012.

2.8 Flood and Coastal Risk Management – Partnerships and strategic overview

The catchment has a history of flood risk, generally due to the high rainfall that can lead to extensive flooding of the

river valleys, and prolonged wet periods that can lead to groundwater flooding.

Over the last 25 years, engineering schemes have been implemented to reduce flood risk in the catchment, including

at Tisbury, Downton, Fordingbridge, Ringwood and Christchurch. Various structures have also been constructed

around Salisbury and Wilton. These measures have all reduced flood risk.

In addition to these engineering schemes, other flood risk management activities are carried out in the catchment.

These include activities which help to reduce the probability of flooding, for example, maintaining and improving

existing flood defences, river channels and road drainage and sewers) and those that address the consequences of

flooding such as mapping, forecasting and planning.

2.9 Bathing Water Issues

There are four designated bathing beaches in the Hampshire Avon Operational Catchment. The Avon discharges at

Christchurch Harbour and the outflow under certain tidal conditions reaches the bathing waters at Friars Cliff,

Highcliffe, Mudeford and Avon Beach. None are currently failing, although they are at risk of pollution from

Christchurch Harbour. Pollution in the harbour can be attributed to the River Stour as well as the Avon.


2.10 Specific Risks of Deterioration

Much of the Hampshire Avon catchment is designated as SSSI and Natura 2000 sites. This limits the types of work we

can do to improve the environment, due to restrictions on the protected areas. Careful planning needs to be

undertaken; to ensure the requirements to get SSSIs to favourable condition are met, alongside measures to get all

waterbodies to Good Ecological Status. Work on the protected areas will take priority, it is important the remaining

water bodies do not deteriorate as a result of this.

Urban development and population increase, particularly in the Upper Avon and tributaries; will increase pressure on

water companies regarding nutrient content in sewage effluent. Although water companies have done a lot of work to

remove 80% of the phosphate from sewage treatment works; point source pollution is still a risk in this catchment.

If rising chemical trends for nitrate and zinc are not addressed, deterioration of the groundwater bodies is a risk.

There are 207 weirs and sluices on the River Avon and it is also embanked in some locations. The channel has been

widened and deepened in many places, for land drainage. Many of the structures cause barriers to migration for

Salmonids, Cyprinids and eels. If these barriers are not addressed there is a risk that current fish populations will

deteriorate. The channel form and lack of habitat diversity and floodplain connection need to be improved by

implementation of the River Avon Restoration Plan.

Rising temperatures due to global warming and a lack of shade on the waterbodies within this catchment; put the

Hampshire Avon at risk of dissolved oxygen failures, as well as reduction in the numbers of Salmonids able to spawn.

There is a tree shading project in progress in the catchment.


3. Partnerships

Table 3. Existing Projects and Partnerships

Existing Partnership Projects

Partner Name Sector/Function

River Avon Restoration Plan EA / NE / WW

Wessex Chalkstream & Rivers Trust

Wessex Chalkstream Project NE/ WW / EA / WWT

Avon Invasive Plants Forum

Avon Salmon Group

Demonstration Catchment Project: Avon & River Avon Catchment Nutrient Management Plan

DEFRA

River Avon Planning Forum (RAPF)

Wiltshire Fisheries Association

Source to sea

Table 4. Potential Projects and Partnerships

Potential Partnership Projects

Partner Name Sector/Function


4. Summary of Reasons for Failure for the Catchment (Table 5)

Waterbody ID Waterbody

Name

HMWB/

Artificial/No *P1/P2/SI Objective

Eco Status

2009

Eco Status

2013 Failing Elements (2009) Reasons for failure

GB108043011020 Mude No 1 GES by 2015 Moderate Moderate Moderate - Fish (Uncertain) Physical Modification - land drainage structures

Suspect Data

GB108043016160 Nadder

(Headwaters) No 0 GES by 2027 Moderate Moderate Moderate - Phosphate

Point source-industrial/trade discharge (non

EPR)

Diffuse source-sewage discharge (diffuse),

mixed agricultural run-off, farm infrastructure

GB108043016180 Nadder Trib

(Swallowcliffe) No 1 GES by 2015 Moderate Poor Moderate - Phosphate (Uncertain)

Diffuse source- mixed agricultural run-off

Suspect data

GB108043016190 Fovant Brook No 1 GES by 2015 Moderate Moderate

Moderate - Phosphate (Very

Certain)

Moderate - Hydrology (HR2a)


Suspect data

GB108043016200 Nadder (Upper) Yes 1 GEP by 2015 Moderate Moderate

Poor - Fish (Very Certain)

Moderate - Dissolved Oxygen

(Uncertain)


Certain)

Point source-sewage discharge (continuous)

Diffuse source-mixed agricultural run-off,farm

infrastructure

physical modification-wider environment -

other

GB108043011010 Ripley Brook No 1 GES by 2015 Moderate Moderate

Moderate - Macrophytes (Quite

Certain)

Moderate - Fish (Quite Certain)

Moderate - pH (Very Certain)

Moderate - Copper (Very Certain)

Point source-industrial/trade discharge (non

EPR)

Natural mineralisation

Suspect data



Name

HMWB/


Eco Status

2009

Eco Status


Moderate - Zinc (Very Certain)

GB108043016210 Sem No 2 GES by 2027 Moderate Moderate Moderate - Phosphate

Point source-sewage discharge (continuous),

unsewered domestic sewage

Diffuse source- mixed agricultural run-off, farm

infrastructure, dairy/beef field

Physical modification-impoundments

Natural conditions - low flows

GB108043022350 Hampshire Avon

(Upper) No 2 GES by 2015 Good Good Good N/A

GB108043022360 Nine Mile River No 1 GES by 2015 Moderate Poor

Moderate - Phytobenthos (Very

Certain)


Flow- surface water abstraction

Suspect data


(West) No 2 GES by 2027 Poor Poor

Poor - Macrophytes (Very Certain)

Poor - Phytobenthos (Very Certain)


Certain)



Diffuse source-mixed agricultural run-off

Flow-groundwater abstraction

GB108043022380

Etchilhampton

Water (Patney

Bif. South)

No 1 GES by 2015 Moderate Moderate Moderate - Phosphate (Uncertain)


Point source- sewage discharge (continuous)





Name

HMWB/


Eco Status

2009

Eco Status


GB108043022390 Bourne No 2 GES by 2021 Poor Moderate


Moderate - Invertebrates

(Uncertain)

Moderate - Phosphate (Quite

Certain)





Physical modification-barriers to fish migration,

urbanisation-other


(East) No 0 GES by 2027 Moderate Moderate Moderate - Phosphate (Uncertain)

Point source- sewage discharge (continuous)



GB108043022410

Hampshire Avon

(East) &

Woodborough

Stream

No 0 GES by 2027 Moderate Moderate Moderate - Phosphate (Very

Certain)



GB108043022420 Deane Water No 2 GES by 2027 Poor Moderate

Poor - Invertebrates (Quite Certain)

Moderate - Phosphate (Quite

Certain)


Invasive non-native species- North American

Signal crayfish

GB108043022430 Etchilhampton

Water No 0 GES by 2027 Moderate Moderate


Certain)





GB108043015720 Linford Brook No 2 GES by 2027 Poor Moderate




Physical modification- barriers to fish migration


Natural conditions-low flows

GB108043015730 Sleep Brook No 0 GES by 2015 Good Good Good N/A



Name

HMWB/


Eco Status

2009

Eco Status


GB108043015740 Dockens Water No 1 GES by 2015 Poor Moderate





Suspect data

GB108043015750 Huckles Brook No 1 GES by 2015 Moderate Moderate Moderate - Copper (Very Certain)

Moderate - Zinc (Quite Certain) Natural Mineralisation

GB108043015770 Ditchend Brook No 1 GES by 2015 Moderate Moderate

Moderate - Macrophytes

(Uncertain)

Moderate - Fish (Uncertain)



Natural Mineralisation

Suspect data

GB108043015800 Ashford Water

(Allen River) Yes 2 GEP by 2015 Good Good Good N/A

GB108043015810 Sweatsford

Water No 0 GES by 2015 Good Good Good N/A

GB108043015830 Ebble No 1 GES by 2015 Moderate Good Moderate - Fish (Uncertain) Physical Modification- barriers to fish

Suspect data

GB108043022460 Nadder Trib

(Baverstock) No 0 GES by 2027 Moderate Good Moderate - Phosphate (Uncertain) N/A

GB108043022470 Nadder (Middle) No 1 GES by 2015 Moderate Poor Moderate - Phosphate (Uncertain) Point source-sewage discharge (continuous)

diffuse source- mixed agricultural run-off

GB108043022500 Fonthill Stream No 0 GES by 2015 Good Good Good N/A

GB108043022510 Wylye (Lower) Yes 2 GEP by 2027 Moderate Moderate Moderate - Fish (Uncertain)

Diffuse source-arable field, drainage-road run-

off




Name

HMWB/


Eco Status

2009

Eco Status


Physical modification-flood protection

structures, urbanisation (urban development

infrastructure)

GB108043022480

Nadder Trib

(Chilmark

Stream)

No 1 GES by 2015 Moderate Good Moderate - Phosphate (Uncertain) Suspect data

GB108043022570 Till No 2 GES by 2015 Good Good Good (Uncertain) N/A


(Lower) Yes 2 GEP by 2027 Poor Poor


Moderate - Macrophytes (Quite

Certain)

Poor - Phytobenthos (Very Certain)

Moderate - Mitigation Measures

Assessment



industrial discharge (EPR), industrial/trade

discharge (non EPR)

Diffuse source- mixed agricultural run-off,

mixed drainage

Physical modification- barriers to fish

migration, land drainage structures, flood

protection structures, urban development

infrastructure


GB108043015860

Ebble Trib

(Chalke Valley

Stream)

No 0 GES by 2015 Good Good Good N/A

GB108043015870 Ebble (Upper) No 0 GES by 2015 Good Good Good N/A

GB108043022520 Wylye

(Headwaters) No 1 GES by 2015 Moderate Moderate Moderate - Fish (Quite Certain) Suspect data



Name

HMWB/


Eco Status

2009

Eco Status


GB108043022530

Wylye Trib

(Heytesbury

Stream)

No 1 GES by 2015 Moderate Good Moderate - Phosphate (Uncertain)



Suspect data

GB108043022540 Wylye Trib (The

Were or Swab) Yes 0 GEP by 2027 Moderate Moderate

Moderate - Phosphate (Uncertain)

Moderate -Mitigation Measures

Assessment

Diffuse source-mixed agricultural run-off,

drainage-road run-off

Physical modification-flood protection-

structures, urbanisation- urban development

infrastructure

GB108043022550 Wylye (Middle) No 2 GES by 2027 Moderate Moderate



Certain)


unsewered domestic sewage

Diffuse source- mixed agricultural run-off,

drainage-road run-off

Physical modification- flood protection

(sediment management)


Suspect data

GB108043022560 Chitterne Brook No 2 GES by 2015 Good Bad Good (Uncertain - WoE) N/A

GB108043015880 Nadder (Lower) No 2 GES by 2015 Good Good Good N/A

*Priority 1 (P1): GES by 2015

*Priority 2 (P2): Improve one failing element by 2015

*Status Investigation (SI): Further evidence required to confirm the failure of a particular element

The current status of waterbodies within the catchment, along with the reasons for failure are shown in figure 9.


Figure 10: Map of Operational Catchment Showing Waterbodies & Reasons for Failure


5. Summary of Existing Measures /Interventions for Catchment (Table 6)

Issue Measure/Intervention Waterbody ID Waterbody Name Who

Unsuitable fish sampling

point

Review fish status from classification data at new survey location.

Fordingbridge Bypass FDS - Midgeham Drain. GB108043015800 Ashford Water (Allen River) EA

Impacts on fish Assess risk of fish deterioration due to ongoing maintenance of

road bridge GB108043015770 Ditchend Brook EA

WFD failures in

Groundwater underlying

the catchment

We are investigating the cause of any groundwater body chemical

failures and a "groundwater body action plan" will be in place by 22

December 2012. This will identify further pollution prevention

activities necessary to try and achieve Good Status by 2027

GB108043015770

GB40801G806900

GB108043011020

Ditchend Brook

Upper Hampshire Avon

Groundwater

H Avon East catchment

Ebble catchment

Mude

Nadder catchment

Nine Mile catchment

H Avon West catchment

Wylye catchment

EA



WFD upward trends in the

concentration of any

pollutant in groundwater

underlying the catchment

The Water Framework Directive (WFD) requires that we implement

measures to reverse any significant and sustained upward trends in

the concentration of any pollutant resulting from human activity. In

order to meet this objective we are undertaking investigations.

GB108043015770

GB40801G806900

GB40801G806900

Ditchend Brook


Groundwater body

Ebble catchment


Groundwater body

Nadder catchment

Wylye catchment

EA

Impacts of groundwater

abstractions on ecology

Hydrological investigations have been undertaken for surface water

bodies across all catchments. Where these investigations have

identified an ecological impact from over abstraction or

quantitative status failure as a result of groundwater abstractions,


Ebble catchment

Nine Mile catchment


Wylye catchment

EA



WFD upward trends in the

concentration of any

pollutant in groundwater

underlying the catchment

The Water Framework Directive (WFD) requires that we implement

measures to reverse any significant and sustained upward trends in

the concentration of any pollutant resulting from human activity. In

order to meet this objective we are undertaking investigations.


Nine Mile catchment


EA

Barriers to fish Investigate impact of gauging weirs and low flows to fish passage. GB108043015720 Linford Brook EA

Impacts on fish Review fish class with respect to the impact of the quarry

discharge. Resurvey after discharge stops (Sept 2013) GB108043011010 Ripley Brook EA

Potential sources of

Phosphate

Ensure that the Groundwater modelling work looking at natural

geological sources of Phosphate in the Upper Hampshire Avon

catchment is joined with proposed plans to monitor phosphates in

the catchment.

GB108043022390

GB108043022350

Bourne


Hampshire Avon Upper


Wylye catchment

EA

Coarse fish entrainment

When the Salmon and Freshwater Fisheries Act 1975 includes

coarse fish entrainment (as well as salmonids) , there is a need to:

review which sites pose a significant risk to coarse fish stocks and

assess what measures are appropriate provide protection.

GB108043015840 Hampshire Avon Lower EA



Barriers to fish Recommend that fish passage is installed at the culvert via EA

uneconomic assets list GB108043011020 Mude EA

Poor River Habitat Appraisal of actions in river restoration plan. Assess priority.

Nadder catchment EA

Fish passage Investigate hatch management/fish passage at Tisbury Gate. GB108043016200 Nadder (Upper) EA

Data Fisheries desk top study to review the existing fisheries data and

new data collected in 2011 re-survey. GB108043022520 Wylye (Headwaters) EA

Impacts of Modifications Desk top investigation into addressing the mitigation measures for

modifications. GB108043022540

Wylye Trib (The Were or

Swab) EA

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