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Please note that the modelling on which these maps are based may have been superseded.
550000 551000 552000 553000 180000 180000
Belvedere 179000 179000 178000 178000
Erith and Slade Green 177000 177000 176000 176000
550000 551000 552000 553000
Key: SHLAA Sites - With Flood Zone Classification London Borough of Bexley Boundary Bexley SFRA Flood Zone 3 LDF Growth Areas Flood Zone 2 Figure C1 Erith and Slade Green Flood Zone 1 Delineation of Flood Risk on SHLAA Sites Basedon Environment Agency Flood Zones 2008
0 190 380 570 760 Meters July 2010 Scale: 1:14000 @ A3 23736-A030.mxd RAMPJ H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects 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 550000 551000 552000 553000 180000 180000
Belvedere 179000 179000 178000 178000
Erith and Slade Green 177000 177000 176000 176000
550000 551000 552000 553000
Key: Employment Sites - With Flood Zone Classification London Borough of Bexley Boundary Bexley SFRA Flood Zone 3 Indicates Primary Sites LDF Growth Areas Figure C2 Flood Zone 2 Erith and Slade Green Delineation of Flood Risk Flood Zone 1 on Employment Sites
0 190 380 570 760 Meters July 2010 Scale: 1:13000 @ A3 23736-A040.mxd RAMPJ H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects 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 550000 551000 552000 553000 180000 180000
Belvedere 179000 179000 178000 178000
Erith and Slade Green 177000 177000 176000 176000
550000 551000 552000 553000 Key: Maximum Flood Depth (m) Bexley SFRA 2.01 - 2.5 London Borough of Bexley Boundary 0 - 0.25 0.25 - 0.5 2.51 - 3 Figure C3 LDF Growth Areas Erith and Slade Green - Maximum 0.50 - 0.75 3.01 - 3.5 Predicted Flood Depths From SHLAA Sites 0.75 - 1 3.51 - 4 all Breaches in the 1 in 200 1.00 - 1.5 4.01 - 5 Year Tidal Event Plus CC Employment Sites 1.51 - 2 5.01 - 6 0 170 340 510 680 Meters July 2010 Scale: 1:13000 @ A3 H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects 23736-A041.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 550000 551000 552000 553000 180000 180000
Belvedere 179000 179000 178000 178000
Erith and Slade Green 177000 177000 176000 176000
550000 551000 552000 553000 Flood Hazard (FD2321/TR2 - Table 3.2) Key: Bexley SFRA < 0.75 Caution London Borough of Bexley Boundary 0.75 - 1.25 'Dangerous for Some' Figure C4 LDF Growth Areas Erith and Slade Green - Maximum 1.25 - 2.5 'Dangerous for Most' Predicted Flood Hazard From all Breaches in the 1 in 200 SHLAA Sites > 2.5 'Dangerous for All' Year Tidal Event Plus CC Employment Sites Zone of Potential Rapid Inundation See Section 2.2.2 of the Level 2 0 175 350 525 700 Meters July 2010 SFRA Report for details of this zone Scale: 1:13000 @ A3 H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects 23736-A042.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 550000 551000 552000 553000 180000 180000
Belvedere 179000 179000 178000 178000
Erith and Slade Green 177000 177000 176000 176000
550000 551000 552000 553000 Key: Maximum Water Surface Elevation Bexley SFRA From all Breaches (1 in 200yr +CC) London Borough of Bexley Boundary mAOD 0.01 - 3.70 5.31 - 5.79 Figure C5 LDF Growth Areas Erith and Slade Green - Maximum 3.71 - 4.10 5.80 - 6.21 Predicted Flood Water Level From SHLAA Sites 4.11 - 4.40 6.22 - 6.75 all Breaches in the 1 in 200 Year Tidal Event Plus CC 4.41 - 4.89 Employment Sites 4.90 - 5.30 0 175 350 525 700 Meters July 2010 Scale: 1:13000 @ A3 23736-A043.mxd RAMPJ H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects
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 550000 551000 552000 553000 180000 180000
Belvedere 179000 179000 178000 178000
Erith and Slade Green 177000 177000 176000 176000
550000 551000 552000 553000
Key: Likely Rate of Flooding Onset (Hours) Bexley SFRA
London Borough of Bexley Boundary Less than 3 hours Figure C6 LDF Growth Areas Less than 6 hours Erith and Slade Green - Combined Likely Rate of Inundation from all Simulated SHLAA Sites Less than 15 hours Breaches (1 in 200yr Plus CC) Area converd at maximum extent Employment Sites
0 175 350 525 700 Meters July 2010 Scale: 1:13000 @ A3 H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects 23736-A044.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 550000 551000 552000 553000 180000 180000
Belvedere 179000 179000 178000 178000
Erith and Slade Green 177000 177000 176000 176000
550000 551000 552000 553000 Key: Bexley SFRA Surface Water Flooding Locations Environment Agency London Borough of Bexley Boundary Classified by Source Flood Zone 3 (September 2008) Foul water Figure C7 Potential Surface Water Flow Routes LDF Growth Areas Surcharge from sewers Erith and Slade Green - Incidents of and Ponding Areas (1 in 100 year +CC Surface Water Flooding and Modelled Surface water rainfall event) SHLAA Sites areas of Potential Surface Water Flow Unknown Routes and Ponding Areas Employment Sites (Data Source = London Borough of Bexley) 0 175 350 525 700 Meters July 2010 Scale: 1:13000 @ A3 H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects 23736-A045.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 550000 551000 552000 553000 180000 180000
Belvedere 179000 179000
0 178000 178000
Erith and Slade Green 177000 177000 176000 176000
550000 551000 552000 553000 Groundwater Head (m below ground) Key: Bexley SFRA -3 - 0 London Borough of 15.01 - 20 45.01 - 50 Bexley Boundary 0 - 2.5 20.01 - 25 50.01 - 55 Figure C8 LDF Growth Areas 2.51 - 5 Depth to groundwater head was based upon ground 25.01 - 30 Erith and Slade Green elevations provided by 5m SAR topographic data SHLAA Sites 5.01 - 7.5 30.01 - 35 Depth to Groundwater Groundwater Contours (m) Head (m below ground level) 7.51 - 10 Employment Sites 35.01 - 40 below ground Supplied by EA 10.01 - 15 40.01 - 45 0 170 340 510 680 Meters July 2010 Scale: 1:13000 @ A3 23736-A046.mxd RAMPJ H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects
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 550000 551000 552000 553000 180000 180000
Belvedere 179000 179000 178000 178000
Erith and Slade Green 177000 177000 176000 176000
550000 551000 552000 553000 Key: Infiltration Suitability Bexley SFRA London Borough of Suitability of Infiltration SuDS Bexley Boundary Highly Low Figure C9 LDF Growth Areas Highly with caution - Low with caution- Erith and Slade Green owing to SPZ designation owing to SPZ designation Soil Infiltration Potential to Inform the SHLAA Sites Intermediate No data available Suitability of Infiltration SuDS Intermediate with caution- Techniques Employment Sites owing to SPZ designation 0 170 340 510 680 Meters July 2010 Scale: 1:13000 @ A3 23736-A047.mxd RAMPJ H:\Projects\HM-255\23000-Projects\23736 - Bexley SFRA\Data\GIS\ESRI\Level2_projects
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