Strategic flood risk assessment (SFRA)

We commissioned consultants AECOM to prepare a new Strategic Flood Risk Assessment (SFRA) replacing the 2015 version. It is an evidence base document which supports the implementation of Core Strategy (PDF, 2.78MB) Policy CS26: Flooding and policies within the Development Management Plan (PDF, 1.13MB).

The SFRA provides an overview of flood risk from all sources, for example, rivers, surface water, groundwater, sewers and reservoirs across the borough. It also provides guidance to assist applicants in preparing Flood Risk Assessments to accompany planning applications.

The report and associated mapping can be accessed below. It is a 'living' document and will be updated to reflect any changes to flood mapping issued by other organisations, for example the Environment Agency.

The SFRA should be referred to in the first instance as it includes the definition Flood Zone 3b (Functional Floodplain), which is not reflected within the Environment Agency's mapping.

Strategic Flood Risk Assessment (SFRA) (2019)

SFRA main report including appendix A - settlement area schedules and appendix G - data register (PDF, 3.81MB)

Appendix A Settlement Area Schedules:

They should be read with reference to the figures in Appendix B, C, D, E and F.

Weybridge (Main Settlement Area),
Walton-on-Thames (Main Settlement Area),
Hersham (Suburban Settlement Area),
Cobham, Oxshott, Stoke D'Abernon and Downside (Service Centre and Rural Fringe),
East and West Molesey (Suburban Settlement Area),
Esher (Suburban Settlement Area),
Thames Ditton, Long Ditton, Hinchley Wood and Weston Green (Suburban Settlement Area), and
Claygate (Suburban Village).

SFRA appendix B - borough scale mapping - figures B1 to B9 (PDF, 17.71MB)

Figure B1 LiDAR Topographic Survey
Figure B2 BGS Superficial Geology
Figure B3 BGS Bedrock Geology
Figure B4 Watercourses and Surface Water Bodies
Figure B5 Areas Susceptible to Groundwater Flooding
Figure B6 BGS Infiltration SuDS Suitability Map (Detailed)
Figure B7 Internal Sewer Flooding
Figure B8 External Sewer Flooding
Figure B9 Flood Warning Areas and Rest Centres

SFRA appendix C - fluvial flood zone mapping - figures C1 to C13 (PDF, 21.7MB)

Figure C1 Fluvial Flood Zones: Weybridge (View 1)
Figure C2 Fluvial Flood Zones: Weybridge (View 2)
Figure C3 Fluvial Flood Zones: Walton-on-Thames (View 1)
Figure C4 Fluvial Flood Zones: Walton-on-Thames (View 2)
Figure C5 Fluvial Flood Zones: Hersham (View 1)
Figure C6 Fluvial Flood Zones: Hersham (View 2)
Figure C7 Fluvial Flood Zones: Cobham, Oxshott, Stoke D'Abernon and Downside (View 1)
Figure C8 Fluvial Flood Zones: Cobham, Oxshott, Stoke D'Abernon and Downside (View 2)
Figure C9 Fluvial Flood Zones: Cobham, Oxshott, Stoke D'Abernon and Downside (View 3)
Figure C10 Fluvial Flood Zones: East and West Molesey
Figure C11 Fluvial Flood Zones: Esher
Figure C12 Fluvial Flood Zones: Thames Ditton, Long Ditton, Hinchley Wood and Weston Green
Figure C13 Fluvial Flood Zones: Claygate

SFRA appendix D - modelled flood outlines - figures D1 to D13 (PDF, 22.05MB)

Figure D1 Modelled Flood Outlines: Weybridge (View 1)
Figure D2 Modelled Flood Outlines: Weybridge (View 2)
Figure D3 Modelled Flood Outlines: Walton-on-Thames (View 1)
Figure D4 Modelled Flood Outlines: Walton-on-Thames (View 2)
Figure D5 Modelled Flood Outlines: Hersham (View 1)
Figure D6 Modelled Flood Outlines: Hersham (View 2)
Figure D7 Modelled Flood Outlines: Cobham, Oxshott, Stoke D Abernon, Downside (View 1)
Figure D8 Modelled Flood Outlines: Cobham, Oxshott, Stoke D Abernon, Downside (View 2)
Figure D9 Modelled Flood Outlines: Cobham, Oxshott, Stoke D Abernon, Downside (View 3)
Figure D10 Modelled Flood Outlines: East and West Molesey
Figure D11 Modelled Flood Outlines: Esher
Figure D12 Modelled Flood Outlines: Thames Ditton
Figure D13 Modelled Flood Outlines: Claygate

SFRA appendix E - historic flooding incidents - figures E1 to E4 (PDF, 10.23MB)

Figure E1 Historic Flood Incidents (View 1)
Figure E2 Historic Flood Incidents (View 2)
Figure E3 Historic Flood Incidents (View 3)
Figure E4 Historic Flood Incidents (View 4)

SFRA appendix F - surface water flood risk mapping - figures F1 to F13 (PDF, 29.96MB)

Figure F1 Risk of Flooding from Surface Water: Weybridge (View 1)
Figure F2 Risk of Flooding from Surface Water: Weybridge (View 2)
Figure F3 Risk of Flooding from Surface Water: Walton-on-Thames (View 1)
Figure F4 Risk of Flooding from Surface Water: Walton-on-Thames (View 2)
Figure F5 Risk of Flooding from Surface Water: Hersham (View 1)
Figure F6 Risk of Flooding from Surface Water: Hersham (View 2)
Figure F7 Risk of Flooding from Surface Water: Cobham, Oxshott, Stoke D Abernon, Downside (View 1)
Figure F8 Risk of Flooding from Surface Water: Cobham, Oxshott, Stoke D Abernon, Downside (View 2)
Figure F9 Risk of Flooding from Surface Water: Cobham, Oxshott, Stoke D Abernon, Downside (View 3)
Figure F10 Risk of Flooding from Surface Water: East and West Molesey
Figure F11 Risk of Flooding from Surface Water: Esher
Figure F12 Risk of Flooding from Surface Water: Thames Ditton
Figure F13 Risk of Flooding from Surface Water: Claygate

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