A methodology for national-scale flood risk assessment

Hall, J.H. and Dawson, R.J. and Sayers, P. and Rosu, C. and Chatterton, J.B. and Deakin, R. (2003) A methodology for national-scale flood risk assessment. Proceedings of the Institution of Civil Engineers - Water and Maritime Engineering, 156 (3).

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Abstract

Risk analysis provides a rational basis for flood management decision-making at a national scale, as well as regionally and locally. National-scale flood risk assessment can provide consistent information to support the development of flood management policy, allocation of resources and monitoring of the performance of flood mitigation activities. However, national-scale risk assessment presents particular challenges in terms of data acquisition and manipulation, numerical computation and presentation of results. A methodology that addresses these difficulties through appropriate approximations has been developed and applied in England and Wales. The methodology represents the processes of fluvial and coastal flooding over linear flood defence systems in sufficient detail to test alternative policy options for investment in flood management. Flood outlines and depths are generated, in the absence of a consistent national topographic and water level data set, using a rapid parametric inundation routine. Potential economic and social impacts of flooding are assessed using national databases of floodplain properties and demography. A case study of the river Parrett catchment and adjoining sea defences in Bridgwater Bay in England demonstrates the application of the method and presentation of results in a geographical information system.

Item Type: Article
Subjects: Floods > General
Divisions: Floods
Depositing User: Unnamed user with email i.services@hrwallingford.com
Date Deposited: 02 Apr 2020 09:46
Last Modified: 29 May 2020 14:39
URI: http://eprints.hrwallingford.com/id/eprint/486

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