Delineating Flood Risk areas in Greater Dhaka of Bangladesh Using Geoinformatics

Author(s): Dr. Ashraf M. Dewan   Dr. Md. Humayun Kabir   M. Monirul Islam

Journal Name: Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards

Volume & Link: 1(4)

Publisher: Taylor and Francis Online

Year: 2007

Abstract:

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

Citation:

Dewan A.M., Kabir M.H., Islam M. M., Kumamoto T., Nishigaki M. (2007) Delineating Flood Risk areas in Greater Dhaka of Bangladesh Using Geoinformatics, Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards, Vol. 1(4), pp. 190-201

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