Flood Analysis of Dhudhana River In Upper Godavari Basin Using HEC-RAS

The present study focus on calculation of surface water elevations on downstream side of upper catchment of Dudhana River for different amount of discharges, and also includes determination of flooding area at different amount of the discharge from dam. Hence, stimulate the critical situation of flood and its impact on Dhudhana River basin on downstream side. USACE Hydrologic Engineering Center's River Analysis System (HEC-RAS 4.1.0) model of given study area was prepared. Study reach consists of 21 cross sections. Hydraulics model, HEC-RAS is employed to evaluate flood conveyance performance and also uniform flow computation is carried out. In the present study, existing storm drains are not only marked but based on the HEC-RAS water surface elevation computation for various flood discharges, need of flood gates on the storm drains are also assessed. The recommendations are done based on this study either to increase height of bank or construct a retaining wall at certain sections along the study reach.