Flood Hazard and Risk Assessment in Mid- Eastern Part of Dhaka, Bangladesh

An inundation simulation has been done for the mid-eastern Dhaka (37.16 km 2 ) on the basis of Digital Elevation Model (DEM) data from Shuttle Radar Topography Mission (SRTM) and the observed flood data for 32 years (1972-2004). The topography of the project area has been considerably changed due to rapid land-filling by land developers. So, collected DEM data has been modified according to the recent satellite image. The inundation simulation has been conducted using HEC-RAS program for 100 year flood. Both present natural condition and condition after construction of proposed levee (top elevation ranges from 8.60 m to 9.00 m) have been considered for simulation. The simulation has revealed that the maximum depth is 7.55 m at the south-eastern part of that area and affected area is more than 50%. Finally, according to the simulation result, a Flood Hazard Map has been prepared using the software ArcGIS. And risk assessment has been done and a Risk Map has been prepared for this area.