2D Flood Simulation and Development of Flood Hazard Map by using Hydraulic Model

Abstract

A flood is an overtopping of water from channel banks which submerges land which is usually dry. In India, floods in Godavari and Sabari River are observed several times but 2006 flood was one of the severe events which affected Khammam district extensively. The present paper demonstrates the analysis of severe flood of Khammam using hydraulic modeling. For this purpose HEC-RAS 2D a Hydraulic model was used to simulate the behavior of study area which covers part of Godavari River and Sabari River in Telangana and Andhra Pradesh states. Model provides detail temporal simulated parameters like depth of water, water elevation with respect to M.S.L and Velocity of flowing water. SRTM 30m posting, river discharge data, LULC for assigning Roughness coefficient was used as input to the model. HEC-RAS Simulated flood results were validated with remotely sensed Radarsat satellite observations. Performance of HEC-RAS model was evaluated according to the criteria of measure of fitting raster cells with satellite data. Validation results showed that performance of HEC-RAS model is very effective and can be used by hydrologist or water resources engineers for planning and development. Keywords Flood inundation simulation; Godavari; RADARSAT; Sabari; SRTM DOI: https://doi.org/10.23953/cloud.ijarsg.424