The aim of this study is to understand the flood inundation situation based on twodimensional model and identify the risk prone areas due to flooding. The part of Kundah river basin, the Nilgiris, Tamil Nadu, South India was selected for this study. The Kundah river is one of the important rivers in the Nilgiris. The entire river is flowing on steep slope hilly terrain. Some major reservoirs like Avalanche, Emarald and Kundah were constructed across Kundah river and mainly used for generating hydroelectric power to fulfill the local domestic needs. In this simulation study, a river length of 19.5 km was taken on the downstream side of Avalanche Reservoir in Kundah river. MIKE 21 flow model was used for generating water surface flow of the study area. River feature and bathymetry were extracted from CARTOSAT1 DEM. The result obtained from flood inundation model shows that the flooding has affected seven habitations situated along the close proximity of river bund and two more habitations located far from river bund.
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