UNCLASSIFIED Publication Catalogue Code: LIT 8980 Flood Risk Maps Risk of Flooding from Reservoirs - Thames River Basin District Why have we produced these maps – what can they be used for? The Flood Risk Regulations require the Environment Agency to publish Flood Risk Maps by December 2013 and review them every six years. A series of Flood Risk Maps have been produced reflecting the different sources of flooding in each River Basin District. These will be used by the Environment Agency to inform the production of Flood Risk Management Plans. What do the Risk Maps show? The Risk of Flooding from Reservoirs Maps show the maximum extent of flooding in the unlikely event that a reservoir should fail together with our National Receptor Dataset (NRD). There are three maps showing what is at risk of flooding (Risk to People, Risk to Economic Activity and Risk to Natural and Historic Environment). We have also tabulated the receptors at risk for each Management Catchment and the total for the River Basin District. This document contains the Risk of Flooding from Reservoirs Maps for the Thames River Basin District as shown in the figure below: Risk to People Map This map shows the number of inhabitants that could be affected by flooding and the potential impact on the services that they use. People at Risk The number of people at risk of flooding has been calculated using guidance from the Office for National Statistics General Lifestyle Survey, 2011. The circles on the map (representing the number of people affected by flooding) are located in the middle of the defined built-up area. Therefore they do not pinpoint exact areas at risk of flooding but instead offer a representation of the overall risk of flooding in that built-up area. (Source: OS MasterMap® Address Layer 2 and OS MasterMap® Topography Layer)
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UNCLASSIFIED
Publication Catalogue Code: LIT 8980
Flood Risk Maps Risk of Flooding from Reservoirs - Thames River Basin District
Why have we produced these maps – what can they be used for?
The Flood Risk Regulations require the Environment Agency to publish Flood Risk Maps by December 2013 and review them every six years. A series of Flood Risk Maps have been produced reflecting the different sources of flooding in each River Basin District. These will be used by the Environment Agency to inform the production of Flood Risk Management Plans.
What do the Risk Maps show?
The Risk of Flooding from Reservoirs Maps show the maximum extent of flooding in the unlikely event that a reservoir should fail together with our National Receptor Dataset (NRD). There are three maps showing what is at risk of flooding (Risk to People, Risk to Economic Activity and Risk to Natural and Historic Environment). We have also tabulated the receptors at risk for each Management Catchment and the total for the River Basin District.
This document contains the Risk of Flooding from Reservoirs Maps for the Thames River Basin District as shown in the figure below:
Risk to People Map
This map shows the number of inhabitants that could be affected by flooding and the potential impact on the services that they use.
People at Risk
The number of people at risk of flooding has been calculated using guidance from the Office for National Statistics General Lifestyle Survey, 2011. The circles on the map (representing the number of people affected by flooding) are located in the middle of the defined built-up area. Therefore they do not pinpoint exact areas at risk of flooding but instead offer a representation of the overall risk of flooding in that built-up area. (Source: OS MasterMap® Address Layer 2 and OS MasterMap® Topography Layer)
UNCLASSIFIED
Publication Catalogue Code: LIT 8980
Services
These include schools, hospitals, nursing/care/retirement homes, police stations, fire and ambulance stations, prisons, sewage treatment works and electricity installations. Only those in areas at risk of flooding are shown on the map. (Source: OS MasterMap® Address Layer 2 and OS MasterMap® Topography Layer)
Built-up areas
These represent urban areas and settlements as defined by the Office for National Statistics (ONS). All built-up areas are shown on the map for context - reporting is only provided for the number of people in these built-up areas at risk of flooding, rather than the area of land itself. (Source: Office for National Statistics 2011 Built-Up Areas)
Risk to Economic Activity Map
This map shows the type of economic activity in the area potentially affected by flooding. All economic activity is shown on the map - viewed together with the flooding information, it shows what is at risk.
Airports
All principal airports serving the United Kingdom, Europe and beyond are displayed on the map. (Source: Ordnance Survey Strategi®)
Railways
Main railway lines are displayed on the map. (Source: Ordnance Survey Meridian™2)
Roads
Motorways, primary and trunk routes are displayed on the map, as classified by the Highways Agency. These are reported in the tables as a single class. (Source: OS MasterMap® Integrated Transport Network™(ITN))
Non-Residential Properties
Property points have been classified according to their function and all residential properties excluded. (Source: OS MasterMap® Address Layer 2 and OS MasterMap® Topography Layer)
Agricultural Land Classification
The Agricultural Land Classification (ALC) of England and Wales is a method for assessing the quality of farmland. Agricultural land is classified into five grades. Grade one is best quality and grade five is poorest quality. The map shows the best and most versatile land - Grades 1, 2 and 3. (Source: Natural England)
Risk to Natural and Historic Environment Map
This map shows protected areas that may be affected in the event of flooding, and other sites where the risk of pollution may be increased in the event of flooding. To keep the map as clear as possible, only internationally designated environmental sites have been displayed on the map. Other designations have been included in the tables.
Special Areas of Conservation (SACs)
Land designated under Directive 92/43/EEC on the Conservation of Natural Habitats and of Wild Fauna and Flora. All SACs are shown on the map regardless of risk. (Source: Natural England)
UNCLASSIFIED
Publication Catalogue Code: LIT 8980
Special Protection Areas (SPAs)
Land classified under directive 79/409 on the Conservation of Wild Birds. All SPAs are shown on the map regardless of risk. (Source: Natural England)
Ramsar Sites
Land listed as a Wetland of International Importance under the Convention on Wetlands of International Importance especially as Waterfowl Habitat (the Ramsar Convention) 1971. All Ramsar Sites are shown on the map regardless of risk. (Source: Natural England)
World Heritage Sites
World Heritage Sites are defined in World Heritage Convention as 'places of outstanding universal value from the point of view of art, history, science or natural beauty'. A Heritage World Convention was drawn up and adopted by UNESCO in 1972 to identify cultural and natural properties throughout the world whose protection would be of concern to the international community. All World Heritage Sites are shown on the map regardless of risk. (Source: English Heritage)
Bathing Waters
Bathing waters are shown on the map where they may be adversely affected by heavy rainfall and are within 50m of surface water flood risk. (Source: Environment Agency)
Environmental Permitting Regulations (EPR) Installations EPR installations range from refineries to breweries and from intensive pig farms to cement works. Each installation has a permit to limit emissions of pollutants to air, water or land. Only active EPR installations within 50m of surface water flood risk have been included on the map. (Source: Environment Agency Pollution Inventory)
Sites of Special Scientific Interest (SSSIs)
Land notified as an SSSI under the Wildlife and Countryside Act (1981), as amended. (Source: Natural England)
Parks and Gardens
The Register of Parks and Gardens of Special Historic Interest serves to ensure that the features and qualities which make these landscapes of national importance can be safeguarded. Inclusion of a historic park or garden on the Register in itself does not bring additional statutory controls, but the Register is recognised as a 'material consideration' in the planning process. (Source: English Heritage)
Scheduled Ancient Monuments
Scheduling is a shorthand term used to refer to the legal system for protecting and conserving nationally important archaeological sites in the United Kingdom. Sites identified for scheduling are designated by the Secretary of State as 'scheduled monuments'. Once a site is scheduled, consent must be obtained from the Secretary of State for any works which affect it. (Source: English Heritage)
Listed Buildings
A listed building is a building which has been placed on the Statutory List of Buildings of Special Architectural or Historic Interest. It is a widely used status, applied to around half a million buildings. There are three grades of listed building. (Source: English Heritage)
Licensed Abstractions
An abstraction licence allocates an exclusive right to take a certain quantity of water from a source of supply (inland water such as rivers or streams or an underground source). An abstraction licence does not guarantee the quality of the water or that the amount authorised for abstraction will always be available. (Source: Environment Agency National Abstraction Licensing Database (NALD))
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Publication Catalogue Code: LIT 8980
Reporting Boundaries used on maps and for tabular statistics
The figures quoted for the River Basin District may not be the same as the total of all the Management Catchments. This is because River Basin Districts also include adjacent transitional and coastal waters.
River Basin Districts (RBDs)
Under the requirements of the Floods Directive, reporting is at the River Basin District level. There are 11 River Basin Districts that are partly or fully in England and Wales. These River Basin Districts are the same as those used by the Water Framework Directive for the river basin planning process. A river basin is the area of land from which all surface run-off and spring water flows through a sequence of streams, lakes and rivers into the sea at a single river mouth, estuary or delta. It comprises one or more individual catchments. A River Basin District is made up of one or several river basins, together with associated coastal waters.
Management Catchments
A catchment is an area with several, often interconnected, water bodies (rivers, lakes, groundwater and coastal waters). Many of the problems facing our water environments are best understood and tackled at a catchment level. There are 101 Management Catchments across the 11 River Basin Districts.
Further Information
Visit our web pages to check your flood risk and for information on how to prepare for flooding.
What other maps have been produced?
A series of Flood Risk Maps have been produced for different sources of flooding in each River Basin District. The Flood Risk Regulations require that we produce surface water flood risk maps for Flood Risk Areas. Not every River Basin District includes a Flood Risk Area.
River Basin Districts Rivers & sea Reservoirs Surface water
1 Anglian 2 Dee 3 Humber 4 North West 5 Northumbria 6 Severn 7 Solway Tweed 8 South East 9 South West 10 Thames 11 Western Wales
World Heritage Sites are provided solely to indicate the location of the designated area. Title, copyright and all other propriety rights remain vested in English Heritage.
Unauthorised reproduction infringes Crown copyright and may lead to prosecution or civil proceedings. Environment Agency, 100026380, 2013.Copyright resides with the data suppliers (see coversheet for details) and the map must not be reproduced without their permission.
Some information is a snapshot of information that is being maintained or continually updated by the originating organisation.Contact Us: National Customer Contact Centre, PO Box 54, Rotherham, S60 1BY. Telephone: 03708 506 506 (Mon to Fri, 8am to 6pm). Email address: [email protected]
Flood Risk SourceReservoirs
Maximum extent of flooding
People at Risk0 - 10001001 - 50005001 +
Services at RiskBuilt-up Areas
0 10 20 30 40Kilometres
Tables showing what is at risk of flooding from reservoirs in the Thames River Basin District:
Number of people Number of peoplein defined area in defined area
at riskRiver Basin District
Thames 14,792,021 940,353Management Catchment
Cherwell 185,956 1,213Colne 864,527 37,170Cotswolds 183,255 1,481Darent 402,987 2,503Kennet and Pang 263,498 4,519Loddon 537,880 14,650London 7,184,700 573,586Maidenhead to Sunbury 555,540 164,253Medway 877,363 17,012Mole 384,197 42,864North Kent 136,977 388Roding, Beam and Ingrebourne 853,283 22,069South Essex 218,555 9,715Thame and South Chilterns 652,713 11,618Thames (tidal) 106 106Upper Lee 645,467 3,621Vale of White Horse 326,394 10,065Wey 513,891 22,367
Number of sites Number of sitesin defined area in defined area
at riskRiver Basin District
Thames 18,337 1,100Management Catchment
Cherwell 634 14Colne 1,289 72Cotswolds 758 8Darent 489 9Kennet and Pang 642 12Loddon 760 21London 6,106 483Maidenhead to Sunbury 650 196Medway 1,414 74Mole 559 53North Kent 256 0Roding, Beam and Ingrebourne 742 27South Essex 247 6Thame and South Chilterns 1,188 39Thames (tidal) 0 0Upper Lee 1,029 20Vale of White Horse 548 14Wey 1,015 52
Unauthorised reproduction infringes Crown copyright and may lead to prosecution or civil proceedings. Environment Agency, 100026380, 2013.Copyright resides with the data suppliers (see coversheet for details) and the map must not be reproduced without their permission.
Some information is a snapshot of information that is being maintained or continually updated by the originating organisation.Contact Us: National Customer Contact Centre, PO Box 54, Rotherham, S60 1BY. Telephone: 03708 506 506 (Mon to Fri, 8am to 6pm). Email address: [email protected]
0 10 20 30 40Kilometres
Tables showing what is at risk of flooding from reservoirs in the Thames River Basin District:
Thames 1,092,068 62,005 Thames 9 2
Cherwell 30,424 433 Cherwell 0 0
Colne 71,366 4,195 Colne 0 0
Cotswolds 43,695 286 Cotswolds 0 0
Darent 31,424 481 Darent 1 0
Kennet and Pang 38,741 289 Kennet and Pang 0 0
Loddon 45,145 875 Loddon 1 0
London 353,609 30,159 London 3 1
Maidenhead to Sunbury 40,032 10,931 Maidenhead to Sunbury 0 0
Medway 98,174 4,807 Medway 0 0
Mole 36,352 2,761 Mole 1 1
North Kent 18,532 19 North Kent 0 0
Roding, Beam and Ingrebourne 46,675 1,145 Roding, Beam and Ingrebourne 0 0
South Essex 16,785 390 South Essex 0 0
Thame and South Chilterns 70,902 1,866 Thame and South Chilterns 1 0
Thames (tidal) 43 43 Thames (tidal) 0 0
Upper Lee 51,618 626 Upper Lee 2 0
Vale of White Horse 33,549 380 Vale of White Horse 0 0
Wey 64,246 2,166 Wey 0 0
Thames 4,747 237 Thames 2,427 150
Cherwell 187 5 Cherwell 94 5
Colne 485 30 Colne 138 7
Cotswolds 247 2 Cotswolds 57 1
Darent 218 7 Darent 78 1
Kennet and Pang 257 0 Kennet and Pang 69 1
Loddon 199 2 Loddon 105 2
London 892 76 London 742 63
Maidenhead to Sunbury 143 55 Maidenhead to Sunbury 64 18
Medway 435 12 Medway 315 29
Mole 221 6 Mole 117 4
North Kent 115 1 North Kent 44 0
Roding, Beam and Ingrebourne 251 10 Roding, Beam and Ingrebourne 79 5
South Essex 118 3 South Essex 65 2
Thame and South Chilterns 294 7 Thame and South Chilterns 149 4
Thames (tidal) 0 0 Thames (tidal) 0 0
Upper Lee 270 3 Upper Lee 93 2
Vale of White Horse 161 2 Vale of White Horse 70 0
Internationally Designated SitesBathing Waters that may beadversely affected by heavy rainfalland are within 50m of flood riskEPR (Environmental PermittingRegulations) Installations within 50mof Risk
Special Areas of ConservationSpecial Protection AreasRAMSAR SitesWorld Heritage Sites
Unauthorised reproduction infringes Crown copyright and may lead to prosecution or civil proceedings. Environment Agency, 100026380, 2013.Copyright resides with the data suppliers (see coversheet for details) and the map must not be reproduced without their permission.
Some information is a snapshot of information that is being maintained or continually updated by the originating organisation.Contact Us: National Customer Contact Centre, PO Box 54, Rotherham, S60 1BY. Telephone: 03708 506 506 (Mon to Fri, 8am to 6pm). Email address: [email protected]
0 10 20 30 40Kilometres
Tables showing what is at risk of flooding from reservoirs in the Thames River Basin District:
Thames 8 0 Thames 320 48
Cherwell 0 0 Cherwell 15 2
Colne 0 0 Colne 17 6
Cotswolds 0 0 Cotswolds 18 0
Darent 0 0 Darent 10 0
Kennet and Pang 0 0 Kennet and Pang 16 0
Loddon 0 0 Loddon 10 2
London 1 0 London 63 22
Maidenhead to Sunbury 0 0 Maidenhead to Sunbury 13 1
Medway 0 0 Medway 33 7
Mole 0 0 Mole 7 2
North Kent 1 0 North Kent 10 1
Roding, Beam and Ingrebourne 0 0 Roding, Beam and Ingrebourne 19 1
South Essex 0 0 South Essex 23 2
Thame and South Chilterns 0 0 Thame and South Chilterns 11 0
Thames (tidal) 0 0 Thames (tidal) 0 0
Upper Lee 0 0 Upper Lee 24 1
Vale of White Horse 0 0 Vale of White Horse 16 1
Wey 0 0 Wey 15 0
Thames 20,583 421 Thames 36,509 1,168
Cherwell 0 0 Cherwell 0 0 Colne 639 0 Colne 199 69 Cotswolds 105 0 Cotswolds 0 0 Darent 0 0 Darent 0 0 Kennet and Pang 206 7 Kennet and Pang 0 0 Loddon 566 0 Loddon 4,238 65 London 2,341 88 London 354 100 Maidenhead to Sunbury 1,529 2 Maidenhead to Sunbury 879 87 Medway 2,480 0 Medway 5,697 28 Mole 877 1 Mole 28 0 North Kent 33 0 North Kent 4,247 83 Roding, Beam and Ingrebourne 837 12 Roding, Beam and Ingrebourne 0 0 South Essex 0 0 South Essex 191 15 Thame and South Chilterns 1,128 204 Thame and South Chilterns 0 0 Thames (tidal) 2 0 Thames (tidal) 6 0 Upper Lee 2 0 Upper Lee 97 29 Vale of White Horse 86 0 Vale of White Horse 0 0 Wey 6,134 108 Wey 7,464 131
Bathing Waters that may be
adversely affected by heavy rainfall
Special Areas of Conservation (SAC)
Special Protection Areas (SPA)
Defined Area
Area
of S
AC (h
ecta
res)
in d
efin
ed a
rea
Area
of S
AC (h
ecta
res)
in d
efin
ed a
rea
at ri
sk
Defined Area
Area
of S
PA (h
ecta
res)
in d
efin
ed a
rea
Area
of S
PA (h
ecta
res)
in d
efin
ed a
rea
at ri
sk
River Basin District River Basin District
Management Catchment Management Catchment
Defined Area
Num
ber o
f EPR
Inst
alla
tions
in d
efin
ed a
rea
Num
ber o
f EPR
Inst
alla
tions
in d
efin
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rea
with
in 5
0m o
f ris
k
Environmental Permitting
Regulations (EPR) Installations
River Basin District
Management Catchment
Defined Area
Num
ber o
f bat
hing
wat
er si
tes
in d
efin
ed a
rea
Num
ber o
f bat
hing
wat
er si
tes
in d
efin
ed a
rea
with
in 5
0m o
f ris
k
River Basin District
Management Catchment
Tables showing what is at risk of flooding from reservoirs in the Thames River Basin District:
Thames 22,959 1,035 Thames 4,263 329
Cherwell 0 0 Cherwell 0 0
Colne 199 69 Colne 0 0
Cotswolds 0 0 Cotswolds 933 15
Darent 0 0 Darent 0 0
Kennet and Pang 0 0 Kennet and Pang 2,546 0
Loddon 0 0 Loddon 0 0
London 354 100 London 730 271
Maidenhead to Sunbury 588 87 Maidenhead to Sunbury 0 0
Medway 3,857 46 Medway 0 0
Mole 0 0 Mole 0 0
North Kent 4,247 83 North Kent 0 0
Roding, Beam and Ingrebourne 0 0 Roding, Beam and Ingrebourne 0 0
South Essex 191 15 South Essex 0 0
Thame and South Chilterns 0 0 Thame and South Chilterns 0 0
Thames (tidal) 6 0 Thames (tidal) 0 0
Upper Lee 97 29 Upper Lee 0 0
Vale of White Horse 0 0 Vale of White Horse 0 0
Wey 310 44 Wey 0 0
Thames 69,536 2,789 Thames 43,859 2,307
Cherwell 930 25 Cherwell 1,999 89
Colne 2,202 287 Colne 3,372 75
Cotswolds 1,703 26 Cotswolds 5,031 49
Darent 1,363 0 Darent 1,475 31
Kennet and Pang 3,119 37 Kennet and Pang 3,720 22
Loddon 5,001 199 Loddon 3,476 102
London 4,571 415 London 4,880 502
Maidenhead to Sunbury 2,737 144 Maidenhead to Sunbury 2,869 727
Medway 10,042 359 Medway 4,044 219
Mole 2,336 7 Mole 797 19
North Kent 4,396 83 North Kent 302 0
Roding, Beam and Ingrebourne 1,762 15 Roding, Beam and Ingrebourne 727 36
South Essex 821 17 South Essex 405 0
Thame and South Chilterns 3,485 260 Thame and South Chilterns 3,723 111
Thames (tidal) 7 0 Thames (tidal) 0 0
Upper Lee 989 39 Upper Lee 3,141 113
Vale of White Horse 757 0 Vale of White Horse 335 0
Wey 9,740 244 Wey 3,558 208
Defined Area
Area
of R
amsa
r (he
ctar
es)
in d
efin
ed a
rea
River Basin District River Basin District
Management Catchment Management Catchment
Area
of R
amsa
r (he
ctar
es)
in d
efin
ed a
rea
at ri
sk
Defined Area
Area
of W
HS (h
ecta
res)
in d
efin
ed a
rea
Area
of W
HS (h
ecta
res)
in d
efin
ed a
rea
at ri
sk
RamsarWorld Heritage
Sites (WHS)
Defined Area
Area
of S
SSI (
hect
ares
)in
def
ined
are
a
Area
of S
SSI (
hect
ares
)in
def
ined
are
aat
risk
Defined Area
Area
of p
arks
and
gar
dens
(hec
tare
s)in
def
ined
are
a
Area
of p
arks
and
gar
dens
(hec
tare
s)in
def
ined
are
aat
risk
Sites of Special Scientific Interest
(SSSI)Parks and Gardens
River Basin District River Basin District
Management Catchment Management Catchment
Tables showing what is at risk of flooding from reservoirs in the Thames River Basin District:
Thames 6,084 317 Thames 76,401 3,014
Cherwell 294 0 Cherwell 4,187 29
Colne 375 7 Colne 4,249 358
Cotswolds 1,166 11 Cotswolds 6,906 44
Darent 45 0 Darent 1,456 7
Kennet and Pang 1,129 0 Kennet and Pang 3,624 56
Loddon 136 0 Loddon 2,330 38
London 298 26 London 18,699 1,041
Maidenhead to Sunbury 170 110 Maidenhead to Sunbury 1,867 539
Medway 350 17 Medway 8,282 405
Mole 47 1 Mole 1,770 70
North Kent 51 0 North Kent 1,502 1
Roding, Beam and Ingrebourne 63 0 Roding, Beam and Ingrebourne 1,670 13
South Essex 122 3 South Essex 324 5
Thame and South Chilterns 1,006 126 Thame and South Chilterns 7,440 158
Thames (tidal) 0 0 Thames (tidal) 0 0
Upper Lee 243 3 Upper Lee 5,413 77
Vale of White Horse 331 11 Vale of White Horse 2,643 6
