IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : 34th World Congress Brisbane : A rapid approach to modelling overland flood risk
A rapid approach to modelling overland flood risk
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Australian insurers have commenced offering flood insurance based on a mainstream flood risk database. However, the potential risks related to overland flooding in urban areas are not adequately identified. An empirical grid based model has been developed to provide a rapid assessment of potential overland flood extents from design rainfall intensities. The approach employs a flow accumulation analysis of digital elevation data identifying overland and mainstream flowpaths and their upstream catchment area. The rational method and AUSIFD are used to obtain design rainfall intensities and catchment concentration times, and thus allow design flows to be determined. The water surface, which is obtained by simply applying Manning’s equation to a cross-section and bed slope along each flowpath, is intersected with the DEM to map the potential flood extents. A comparison with hydrodynamically modelled data and sensitivity checks of the empirical parameters has shown good agreement across a number of flood frequencies.
File Size : 355,466 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : 34th World Congress Brisbane
Date Published : 07/08/2012
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