Strategic Flood Risk Assessment - Wiltshire Council

Wiltshire CouncilSFRA High Level Executive Summary3 Collation and Review of Datasets3.1 Overview3.1.1 This chapter provides details on the collation of the GIS datasets accompanying the existingLevel 1 SFRAs. The datasets have been integrated to provide an accessible format whichwill enable Wiltshire Council to determine flood risk to future development sites across theWiltshire Council administrative area. The integrated datasets will allow Wiltshire Council toundertake the Sequential Test and identify where the Exception Test may be required.3.2 Collation of GIS Datasets3.2.1 The integrated datasets are shown in Table 3-1. Due to variation within each district of theavailability of data collected during the Level 1 SFRA process, some integrated datasets areshown to cover only parts of the study area.3.2.2 It is important that the methodologies and limitations of the datasets are understood beforethe mapping is used for planning purposes. The existing Level 1 SFRAs provide a detaileddescription, including the methodologies used to generate the GIS datasets shown in Table3-1.Table 3-1: Key Level 1 SFRA GIS datasets provided by the LPAsKey Datasets KennetNorthWiltshireSalisbury West WiltshireCurrent Flood Zones 2 and 3 a/bClimate Change Flood Zone 3 a/bMain Rivers Sub-catchment BoundariesArtificial Flood Source NFCDD Structures NFCDD Defences Flood Storage Areas FRIS Incidents FRIS Properties GroundwaterFlooding DatabaseLocalised FloodingDatabaseSewer FloodingWessex WaterHistoric FloodOutlines 11 June 2009