Flood mapping for Sungai Bunus

Abstract

Nowadays, the occurrence of flash flood in urban area in Malaysia has become major problem. . Flood Mapping is one of the method that shows the flood extent at the area that involve with flooding. There are a lot of beneficial on this flood inundation map. This flood mapping for Sungai Bunus were modelled using a HEC-GeoRAS two-dimensional hydraulic model to capture the hydraulic response of the river and its floodplains in extreme flooding condition due to major storm events. Digital terrain model (DTM) or LIDAR data are used for flood mapping process. The model is capable to predict flood depth and velocity magnitude of flood propagation. The flood mapping could assist local authorities to develop flood warning system at the flood prone area and prepare proper mitigation measures to prevent catastrophic damage and lost at the area where the flood frequently occur. This flood mapping was develop with two scenario which is existing river without flood pond and existing river with flood pond. The result shows significant reduction in flood water level if a series of pond from upstream was use as a flood mitigation measures.