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

Understanding flood risk from a planning perspectiveThis Level 2 SFRA provides an overview of flood risk from a planning perspective to aid thecouncil when undertaking the Exception Test. The SFRA presents a summary of flood riskfrom all sources to groups of strategic development sites within the borough. An outlinemitigation strategy for Wigan has been prepared, which provides advice on how developmentcould proceed in flood risk areas and be compliant with the requirements of PPS25. TheSFRA has assessed the likelihood of strategic development sites passing the Exception Test.Recommendation for further workThe SFRA has made the following recommendation for further work:1. A Scoping SWMP in partnership with United Utilities, British Waterways and theEnvironment Agency to identify particular hotspots where surface water solutions canbe identified or more detailed modelling is needed.2. A Drainage Strategy should be undertaken as part of or alongside this for keydevelopment areas to identify locations suitable for SUDS and how flood risk can bemanaged and reduced downstream. The SWMP may be usefully undertaken as partof an AGMA wide SWMP.SFRA MappingA suite of strategic flood risk maps have been produced for the SFRA. In keeping withPPS25 and the associated Practice Guide, these maps should be used to locatedevelopment away from areas at high risk of flooding.Future development planning also needs to make reference to this suite of strategic flood riskmaps, as well as any updated information provided by the LPA and Environment Agency.Use of SFRA DataWhilst all data used in the preparation of this SFRA has been supplied to the LPA (including,for example, reports, mapping, GIS and modelled data) there is a need to maintain controlsover the data and how it is applied and modified. It is anticipated that the SFRA andassociated maps will be published on the Council's website as PDFs. As the central sourceof SFRA data, these maps will be available to download.The LPA will be able to use the modelled output (depths, hazards and outlines) for internaluse. The use of this information must consider the context within which it was produced. Theuse of this data will fall under the license agreement between the LPA and the EnvironmentAgency as it has been produced using Environment Agency data. It should be rememberedthat the modelling undertaken for the SFRA is of a strategic nature and more detailed FRAsshould seek to refine the understanding of flood risk from all sources to any particular site.SFRA data should not be passed on to third parties outside of the LPA. Any third partywishing to use existing Environment Agency flood risk datasets should contact ExternalRelations in the Environment Agency North West Region. A charge is likely to apply for theuse of this data.2009s0578 Final SFRA with Environment Agency Comments - L2 Ver5 Wigan.docv