National flood hazard mapping for Scotland - an innovative approach

National flood hazard mapping for Scotland - an innovative approach.
McGahey , C.and Ramsbottom, D. and Panzeri, M. and Millington, R.
In: 40th Defra Flood and Coastal Management Conference, 5 - 7 July 2005, York, UK. (2005)

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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.
Item Type:Conference or Workshop Item (Paper)
Subjects:Floods > Flood risk assessment and mapping
Floods > Flood impacts
ID Code:77
Deposited On:14 Feb 2008 01:19
Last Modified:07 Aug 2014 09:21

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