International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage



(7941) Floodplain mapping
The process involves estimating the extent of floods with defined return periods, although some maps are based on the extent of the largest recorded flood. Maps frequently show zones exposed to different frequencies of flooding, and many indicate flood depths and flow paths. In areas where the precise location of future floods cannot be determined (in semi-arid areas with moveable channels, for example), maps need to show risk information in a different way. Such mapping also has to be continually reviewed for potential changes resulting from upstream or downstream modifications affecting flood runoff (construction within the floodplains, deforestation in catchment, etc.).

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