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London Borough of Bexley Strategic Flood Risk Assessment – Level 2 Appendix C – Level 2 Mapping – Erith and Slade Green Sustainable Growth Area 2 June 2011 Please note that the modelling on which these maps are based may have been superseded.
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Page 1: London Borough of Bexley · H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects 0 175 350 525 700 Meters London Borough of Bexley Boundary LDF Growth

London Borough of Bexley

Strategic Flood Risk Assessment – Level 2

Appendix C – Level 2 Mapping – Erith and Slade Green Sustainable Growth Area

2 June 2011

Please note that the modelling on which these maps are based may have been superseded.

Page 2: London Borough of Bexley · H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects 0 175 350 525 700 Meters London Borough of Bexley Boundary LDF Growth

Bexley SFRA

Figure C1Erith and Slade GreenDelineation of Flood Risk on SHLAA Sites

23736-A030.mxd RAMPJ

Key:

Based upon the Ordnance Survey Map with the permission of the Controller of Her Majesty's Stationery Office. © Crown Copyright. London Borough of Bexley AL100017693

Scale: 1:14000 @ A3July 2010

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London Borough of Bexley BoundarySHLAA Sites - With Flood Zone ClassificationFlood Zone 3Flood Zone 2

Flood Zone 1

LDF Growth Areas

Basedon Environment Agency Flood Zones 2008

Belvedere

Erith and Slade Green

Page 3: London Borough of Bexley · H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects 0 175 350 525 700 Meters London Borough of Bexley Boundary LDF Growth

Bexley SFRA

Figure C2Erith and Slade GreenDelineation of Flood Riskon Employment Sites

23736-A040.mxd RAMPJ

Key:

Based upon the Ordnance Survey Map with the permission of the Controller of Her Majesty's Stationery Office. © Crown Copyright. London Borough of Bexley AL100017693

Scale: 1:13000 @ A3July 2010

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London Borough of Bexley Boundary

LDF Growth Areas

Belvedere

Erith and Slade Green

Employment Sites - With Flood Zone ClassificationFlood Zone 3Flood Zone 2

Flood Zone 1

Indicates Primary Sites

Page 4: London Borough of Bexley · H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects 0 175 350 525 700 Meters London Borough of Bexley Boundary LDF Growth

Bexley SFRA

Figure C3Erith and Slade Green - Maximum Predicted Flood Depths Fromall Breaches in the 1 in 200 Year Tidal Event Plus CC

23736-A041.mxd RAMPJBased upon the Ordnance Survey Map with the permission of the Controller of Her Majesty's Stationery Office. © Crown Copyright. London Borough of Bexley AL100017693

July 2010

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London Borough of Bexley Boundary

LDF Growth Areas

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Scale: 1:13000 @ A3H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects

0 170 340 510 680Meters

Maximum Flood Depth (m)

0.25 - 0.50.50 - 0.750.75 - 11.00 - 1.51.51 - 2

2.01 - 2.52.51 - 33.01 - 3.53.51 - 44.01 - 55.01 - 6

0 - 0.25

SHLAA SitesEmployment Sites

Page 5: London Borough of Bexley · H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects 0 175 350 525 700 Meters London Borough of Bexley Boundary LDF Growth

Bexley SFRA

Figure C4Erith and Slade Green - Maximum Predicted Flood Hazard Fromall Breaches in the 1 in 200 Year Tidal Event Plus CC

23736-A042.mxd RAMPJBased upon the Ordnance Survey Map with the permission of the Controller of Her Majesty's Stationery Office. © Crown Copyright. London Borough of Bexley AL100017693

July 2010

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Scale: 1:13000 @ A3H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects

0 175 350 525 700Meters

London Borough of Bexley Boundary

LDF Growth Areas

SHLAA SitesEmployment Sites Zone of Potential Rapid Inundation

See Section 2.2.2 of the Level 2 SFRA Report for details of this zone

< 0.75 Caution

1.25 - 2.5 'Dangerous for Most'

> 2.5 'Dangerous for All'

Flood Hazard (FD2321/TR2 - Table 3.2)

0.75 - 1.25 'Dangerous for Some'

Page 6: London Borough of Bexley · H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects 0 175 350 525 700 Meters London Borough of Bexley Boundary LDF Growth

Bexley SFRA

Figure C5Erith and Slade Green - Maximum Predicted Flood Water Level Fromall Breaches in the 1 in 200 Year Tidal Event Plus CC

23736-A043.mxd RAMPJ

Based upon the Ordnance Survey Map with the permission of the Controller of Her Majesty's Stationery Office. © Crown Copyright. London Borough of Bexley AL100017693

July 2010

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Scale: 1:13000 @ A3H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects

0 175 350 525 700Meters

4.11 - 4.404.41 - 4.894.90 - 5.30

5.31 - 5.795.80 - 6.21

Maximum Water Surface ElevationFrom all Breaches (1 in 200yr +CC) mAOD

0.01 - 3.703.71 - 4.10

6.22 - 6.75

London Borough of Bexley Boundary

LDF Growth Areas

SHLAA SitesEmployment Sites

Page 7: London Borough of Bexley · H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects 0 175 350 525 700 Meters London Borough of Bexley Boundary LDF Growth

Bexley SFRA

Figure C6Erith and Slade Green - Combined LikelyRate of Inundation from all Simulated Breaches (1 in 200yr Plus CC)

23736-A044.mxd RAMPJBased upon the Ordnance Survey Map with the permission of the Controller of Her Majesty's Stationery Office. © Crown Copyright. London Borough of Bexley AL100017693

July 2010

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London Borough of Bexley Boundary

LDF Growth Areas

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Scale: 1:13000 @ A3H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects

0 175 350 525 700Meters

SHLAA SitesEmployment Sites

Less than 15 hours

Likely Rate of Flooding Onset (Hours)Less than 3 hours

Less than 6 hours

Area converd at maximum extent

Page 8: London Borough of Bexley · H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects 0 175 350 525 700 Meters London Borough of Bexley Boundary LDF Growth

Bexley SFRA

Figure C7Erith and Slade Green - Incidents ofSurface Water Flooding and Modelledareas of Potential Surface Water FlowRoutes and Ponding Areas

23736-A045.mxd RAMPJBased upon the Ordnance Survey Map with the permission of the Controller of Her Majesty's Stationery Office. © Crown Copyright. London Borough of Bexley AL100017693

July 2010

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LDF Growth Areas

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Scale: 1:13000 @ A3H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects

0 175 350 525 700Meters

SHLAA SitesEmployment Sites

Environment Agency Flood Zone 3 (September 2008)Potential Surface Water Flow Routesand Ponding Areas (1 in 100 year +CCrainfall event)

(Data Source = London Borough of Bexley)

Surface Water Flooding Locations Classified by Source

Foul waterSurcharge from sewersSurface waterUnknown

Page 9: London Borough of Bexley · H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects 0 175 350 525 700 Meters London Borough of Bexley Boundary LDF Growth

Bexley SFRA

Figure C8Erith and Slade GreenDepth to GroundwaterHead (m below ground level)

23736-A046.mxd RAMPJ

Based upon the Ordnance Survey Map with the permission of the Controller of Her Majesty's Stationery Office. © Crown Copyright. London Borough of Bexley AL100017693

July 2010

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Scale: 1:13000 @ A3H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects

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Groundwater Contours (m) below ground Supplied by EA

Groundwater Head (m below ground)-3 - 00 - 2.52.51 - 55.01 - 7.57.51 - 1010.01 - 15

15.01 - 2020.01 - 2525.01 - 3030.01 - 3535.01 - 4040.01 - 45

45.01 - 5050.01 - 55

Depth to groundwater head was based upon ground elevations provided by 5m SAR topographic data

London Borough of Bexley BoundaryLDF Growth Areas

SHLAA SitesEmployment Sites

Page 10: London Borough of Bexley · H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects 0 175 350 525 700 Meters London Borough of Bexley Boundary LDF Growth

Bexley SFRA

Figure C9Erith and Slade GreenSoil Infiltration Potential to Inform theSuitability of Infiltration SuDS Techniques

23736-A047.mxd RAMPJ

Based upon the Ordnance Survey Map with the permission of the Controller of Her Majesty's Stationery Office. © Crown Copyright. London Borough of Bexley AL100017693

July 2010

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Scale: 1:13000 @ A3H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects

0 170 340 510 680Meters

London Borough of Bexley BoundaryLDF Growth Areas

SHLAA SitesEmployment Sites

IntermediateIntermediate with caution- owing to SPZ designation

Infiltration SuitabilitySuitability of Infiltration SuDS

HighlyHighly with caution - owing to SPZ designation

No data available

LowLow with caution- owing to SPZ designation


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