Level 2 Strategic Flood Risk Assessment (.pdf ... - Wigan Council

Map Name Map Reference Map Title DescriptionDevelopment Management officerSet A - Flood Zones 2009s0578 - D001_010a FLOOD ZONEMAPEnvironment Agency / other defences held in NFCDD (National Flood andCoastal Defence Database). The flood extents shown represent the risk of flood ifthese defences were not maintained to 5% AEP or greater. In the absence of flooddefences, sites covered by this extent would be designated as Flood Zone 3b.Set B - Flood Zone 3Depth Map2009s0578 - D002_001FLOOD DEPTHMAPDigital Terrain Model (DTM) of Flood Zone 3 in Wigan Borough and location ofpotential development sitesThis will show likely depths of Flooding within Flood Zone 3 - at presents the DTMshows land height above sea level and therefore we are assuming low areas of landwithin Flood Zone 3 are more likely to flood than those areas of land that are higher. Italso displays proposed development sites within the borough. A strategic depth gridhas been created using the extent of Flood Zone 3 and topographic data. These mapsenable identification of variation in flood risk throughout the Flood Zone.Set B - Flood Zone 3Depth Map2009s0578 - D002_002FLOOD DEPTHMAPDigital Terrain Model (DTM) of Flood Zone 3 in Wigan BoroughThis will show likely depths of Flooding within Flood Zone 3 - at presents the DTMshows land height above sea level and therefore we are assuming low areas of landwithin Flood Zone 3 are more likely to flood than those areas of land that are higher. Astrategic depth grid has been created using the extent of Flood Zone 3 andtopographic data. These maps enable identification of variation in flood riskthroughout the Flood Zone.Set B - Flood Zone 3Depth Map2009s0578 - D002a_001FLOOD DEPTHMAPDepth of flooding in Flood Zone 3 in Wigan Borough using JFLOW + modellingand location of potential development sitesThis map provides an indication of the depths of flooding within Flood Zone 3 obtainedfrom JFLOW+ modelling outputs undertaken by JBA Consulting in 2010 for the WiganBorough Council Level 2 SFRA. It also displays proposed development sites withinthe borough. A strategic depth grid has been created using the extent of Flood Zone 32009s0578 Final SFRA with Environment Agency Comments - L2 Ver5 Wigan.docVII