Flood Risk Factsheet – Riverside Hotel and Botley Road
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Flood Risk Factsheet – Riverside Hotel and Botley Road Site Name Riverside Hotel and Botely Road Site Address 3-15 Botley Road National Grid Reference 450360 206210 Catchment ISIS Primary Source of Flood Risk Fluvial from River ISIS Secondary Sources of Flood Risk Surface Water, Ground Water Site Area (Ha) 0.22 Area within FZ1 0 Area within FZ2 0.16 Area within FZ3a 0.06 Area within FZ3b 0 Is the site at risk from a 1% AEP? Yes, but only 25% of the site area within FZ3 Is the site protected from flood risk No management assets? What is the flood hazard to the site? Flood Depth analysis has shown that approximately 75% of the site is not considered to be at risk from flooding so could be developed as there is no associated flood hazard. Is the site at risk from surface water flooding? Yes 0.03Ha in less risk from AStSWF but no area > 0.3m deep on FMfSW Is the site at risk from groundwater flooding? Yes 0.22Ha with > 75% susceptibility to groundwater flooding Is the site within a Critical Drainage Area? Yes Can the site be developed sequentially to Yes avoid vulnerable uses on areas with high probability? Will the development result in offsite impacts, Yes, but this can be managed on site through the e.g. increased runoff? use of SUDS Is there dry access and egress to the site No, whilst Botley Road is within FZ2, parts of the during a flood event for occupants? road are within FZ3 Is there access and egress to the site during a Yes from Botley Road flood event for emergency service vehicles? Is the site covered by flood warnings? Yes, it’s within the “River Thames and tributaries in the Binsey, Osney and Osney Island areas in Oxford” Flood Warning Area and is also situated in a larger geographical area “River Thames and tributaries in the Oxford Area, including areas between Wolvercote down to and including Radley and Jericho”, where the Environment Agency provide a general Flood Alert early notification to possible flooding. Can the residual risk be managed through The majority of the site is within Flood Zone 2 so appropriate evacuation and flood response is not considered to be at high risk from flooding procedures? and, there is, therefore no requirement for evacuation or flood response procedures. Is compensatory flood storage required? Potentially but depends on the masterplan layout of the development Can the loss of floodplain be compensated for Unlikely as there are no areas within Flood Zone in the site? 1 Can the development reduce flood risk? There may be an opportunity to reduce surface water runoff as the site is brownfield and as it is within a Critical Drainage Area there is an onus on betterment of the existing runoff rates. What is the Likelihood of the Exception Test Only part of the site is shown to be at high risk or being passed? hazard of flooding and there is potential for the site to be sequentially developed to avoid vulnerable uses on areas with high probability Whilst, there is no dry access, the depth of flooding is <0.3 m so there is safe access and egress to the site during a flood event for emergency service vehicles. The Exception Test is likely to be passed on the basis that there is sufficient developable land in Flood Zone 2. Flood Risk Map Legend FZ 3b FZ 3a FZ 2 Development Site Reproduced from the Ordnance Survey map with the permission of the Controller of Her Majesty's Stationery Office (HMSO). © Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. 1% AEP Flood Depth Map Reproduced from the Ordnance Survey map with the permission of the Controller of Her Majesty's Stationery Office (HMSO). © Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. 1% AEP Flood Hazard Map Reproduced from the Ordnance Survey map with the permission of the Controller of Her Majesty's Stationery Office (HMSO). © Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Areas Susceptible to Surface Water Flooding (AStSWF) Map Legend Less Intermediate More Development Site Reproduced from the Ordnance Survey map with the permission of the Controller of Her Majesty's Stationery Office (HMSO). © Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Flood Map for Surface Water (FMfSW) Map Legend 200 year >0.1m deep 200 year >0.3m deep Development Site Reproduced from the Ordnance Survey map with the permission of the Controller of Her Majesty's Stationery Office (HMSO). © Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. Areas Susceptible to Ground Water Flooding (AStGWF) Map Reproduced from the Ordnance Survey map with the permission of the Controller of Her Majesty's Stationery Office (HMSO). © Crown Copyright. Unauthorised reproduction infringes Crown Copyright and may lead to prosecution or civil proceedings. .