National flood hazard mapping for Scotland - an innovative approach

McGahey, C. and Ramsbottom, D. and Panzeri, M. and Millington, R. (2005) National flood hazard mapping for Scotland - an innovative approach. In: Defra Flood and Coastal Management Conference 2005, 5 - 7 July 2005, York, UK.

PDF HRPP339_National_flood_hazard_mapping_for_Scotland_-_an_innovative_approach.pdf Available under License Creative Commons Attribution. Download (2MB)

Abstract

National-scale fluvial and coastal water level prediction and flood extent mapping is an essential planning tool for the management of flood risks through strategic planning, risk mapping, land-use development and management of flood defences. The Scottish Environment Protection Agency has commissioned HR Wallingford to provide an innovative, semi-automated, robust approach for the prediction of flood hazard maps for Scotland. These include flood events with a 1.0%, 0.5% and 0.1% annual probability of occurrence in the absence of defences. The methodology is based on state of the art GIS scripts developed in-house for handling and processing large volumes of data. The hydraulic calculation incorporates the latest R&D research such as the new EA/Defra Conveyance Estimation System (CES) software, recent initiatives for the assessment of uncertainty and an independent study to establish the likelihood of the Digital Terrain Model (DTM) identifying the channel bed, through consideration of bankfull discharge. The InfoWorks RS (IWRS) 1D hydrodynamic modelling software is used for simulating the hydraulics and for flood spreading. The method is designed to readily incorporate existing more detailed hydraulic models, information on previous flooding and local flood defence data. This paper describes the complete flood mapping methodology.

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