Strategic Flood Risk Assessment - South Worcestershire ...

7 Summary assessment of SWDP developmentsites7.1 IntroductionAs of 3 rd July 2012, there are 177 proposed allocation sites proposed for inclusion in the SouthWorcestershire Development Plan by the three councils.An initial scoping assessment of these sites was undertaken to identify the level of flood risk tothese sites and potential requirement for further, more detailed, assessment. The sites werecompared against Flood Zones 1, 2 and 3, the 2007 historic flood map and the Flood Map forSurface Water. The sites were placed into one of four categories.Sites in Flood Zone One only and not shown at risk from surface waterSites in Flood Zone One only but shown as being at risk from surface waterSites in Flood Zone Two (including 2007 historic flood map)Sites in Flood Zone Two and ThreeA summary of these findings are provided inTable 7-1 and a breakdown of the risk to each site is provided in Appendix F.Important Note: An update to the Environment Agency’s Flood Zones, to be completed later thisyear, will incorporate the Environment Agency’s Historic Flood Map into the Flood Zone 2 outline.The Historic Flood Map is based on Environment Agency data, aerial photography and ground surveyand observations during the flood events.After discussions with the EA, the Historic Flood Map has been incorporated into Flood Zone 2 for thisstudy. When using the mapping provided as part of this SFRA update, where the Historicoutline extent is greater than the 1 in 1000 year modelled extent (Flood Zone 2) then theHistoric outline is considered to be Flood Zone 2, and should be used when undertakingassessments of flood risk.Flood ZoneOne onlyTable 7-1: Summary of risk to proposed allocation sitesFlood ZoneOne andFMfSWNumber of SitesFlood ZoneTwoFlood ZoneTwo andThreeTotal48 91 9 29 177Sites with ordinary watercourses not included in the flood zones were modelled for this SFRA todetermine the level of risk. Of the 24 sites identified, one was shown to be at risk from FloodZone 2 and 15 were shown to be at risk from Flood Zone 3. The remaining sites were shown notto be at any risk from fluvial flooding.Those sites shown to be in Flood Zone Two and Flood Zone 3 have been taken forward in thisSFRA for more detailed assessment. This assessment is summarised in the following tables.Guidance for Flood Risk Assessment requirements for the remaining sites is provided in sections5 and 8.Note: Environment Agency guidance provided with the Flood Map with Surface Water placeslimitations on the base map scale and zoom scale at which it can be displayed 13 as scales largerthan those suggested implies an inappropriate degree of accuracy which may lead to increasedrisk of misinformed decision making. Thus when using the maps it should be appreciated thatthe level of detail of the analysis does not reflect the high resolution inferred by the scale of the13 Using Surface Water Flood Risk Information: Guidance for LRF, RRT, LPA and LLFA. V1 (Environment Agency,November 2010)2012s5947 S Worcestershire Level 2 SFRA Update FINAL Report v1.0.doc 42