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

Map Name Map Reference Map Title Descriptionas proposed Wigan development sites.Set J - Open Space 2009s0578 - D010_004 OPEN SPACE Displays sites of Open Space in Wigan, as well as new development sites thatintersect Open Space that is within 5 metres of a main river.Set J - Open Space 2009s0578 - D010_005 OPEN SPACE Displays sites of Open Space in Wigan, as provided by Wigan Council, whichcould potentially be used for Flood Alleviation. It also shows New DevelopmentSites that intersect Potential Flood Alleviation Sites.Set J - Open Space 2009s0578 - D010_006 OPEN SPACE -FLOODALLEVIATIONSITESDisplays areas of Open Space which are within 5m of a Main River and PotentialFlood Alleviation Sites.Set K - StrategicSites2009s0578 - D011_001STRATEGICSITESDisplays key strategic sites in Wigan.Set L - FloodVelocity Map2009s0578 - D012_001FLOODVELOCITY MAPDisplays strategic flood velocities during a 1% AEP storm event obtained fromJFLOW+.Set M - CanalBreach VelocityGrids2009s0578 - D013_001CANALBREACHVELOCITYGRIDIndicates potential breach failure velocity rates of canal pounds along the LeedsLiverpool Canal through the Wigan borough. "Canal Hazard Zones" have beengenerated for areas which could flood if the Leeds and Liverpool canal were to overtopor breach. These hazard zones should influence the spatial placement ofdevelopment during the Sequential Test and highlight the need for FRA to investigatethe residual risk further during a site-specific FRA. It is recommended that detailedinvestigations should be carried out and results incorporated into the final designfinished floor levels of the development. Site emergency plans should also take theresidual risk into account.Set M - CanalBreach VelocityGrids2009s0578 - D013_002CANALBREACHVELOCITYIndicates potential breach failure velocity rates of canal pounds along the LeedsLiverpool Canal through the Wigan borough. "Canal Hazard Zones" have beengenerated for areas which could flood if the Leeds and Liverpool canal were to overtop2009s0578 Final SFRA with Environment Agency Comments - L2 Ver5 Wigan.docXII