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Citation Information

Type Journal Article - Georisk
Title Delineating flood risk areas in Greater Dhaka of Bangladesh using geoinformatics
Volume 1
Issue 4
Publication (Day/Month/Year) 2007
Page numbers 190-201
URL http://www.tandfonline.com/doi/abs/10.1080/17499510701772097#.Vc5OpbLtlBc
This paper illustrates the development of flood hazard and risk maps in Greater Dhaka of Bangladesh using geoinformatics. Multi-temporal RADARSAT SAR and GIS data were employed to delineate flood hazard and risk areas for the 1998 historical flood. Flood-affected frequency and flood depth were estimated from multi-date SAR data and considered as hydrologic parameters for the evaluation of flood hazard. Using land-cover, gemorphic units and elevation data as thematic components, flood hazard maps were created by considering the interactive effect of flood frequency and flood water depth concurrently. Analysis revealed that a major portion of Greater Dhaka was exposed to high to very high hazard zones while a smaller portion (2.72%) was free from the potential flood hazard. Flood risk map according to administrative division showed that 75.35% of Greater Dhaka was within medium to very high risk areas of which 53.39% of areas are believed to be fully urbanized by the year 2010.

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