Development of an Accurate Flood Map by Integrating Satellite Data & MIKE 11 Flood Model

The objective of the study was to develop an accurate flood inundation map in Munshiganj district by integrating Satellite images and MIKE-11 flood model. The Digital Elevation Model (DEM) available for this area was of 900m spatial resolution and obtaining an accurate flood map was not possible with such a coarse resolution DEM.

      Therefore, a base DEM was prepared for the area by using the Shuttle Rader Topography Mission (SRTM) data of 90m spatial resolution and it was further improved by using spot height data obtained from a differential GPS survey. The flood inundation map prepared by using this DEM with the corresponding river discharges of July 17, 2006 found to be highly accurate. The ALOS-PRISM data obtained for the area was used to get an updated landuse/landcover map. It was found that the ALOS-PRISM data was good enough for updating the road network and building database for assessing the flood damage.