In this paper, a study to analyses the impact of accuracy of DEM model in flood inundation simulation is presented. The accuracy means the hydrological accuracy of the DEM, such that generated drainage networks from the DEM model represents the actual flow paths adequately. It can be seen from the analysis that with the improvement of the DEM, improvement occurs in the generated drainage network. As with the existing topography data, it was not possible to improve the DEM beyond a certain extent, an algorithm is used to improve the DEM hydrologically using the existing streamlines. The simulated results of the flood inundation model show that flood inundation simulation can be improved by hydrologically improving the DEM model. Such an approach of DEM improvement is required for large catchments where existing DEM data are not adequate to generate a drainage network that can represents the actual flow paths.
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