Mathematical and Hydraulic Analysis of Flood Events Using HEC-RAS in the River Basin: A Case Study

Abstract

Flood modeling plays an important role in flood prone area like Krishna River basin in Sangli district, Maharashtra, India. The present study aims to use HEC-RAS for 1D steady flow analysis with geospatial techniques. In addition to GIS features for thorough data collection, pre-processing, spatial analysis, and visualization, Digital Elevation Model (DEM) is used for topographic representation. Using a 1D HEC-RAS model, which is computationally efficient for examining longitudinal flow dynamics, river flow and water surface profiles are simulated. Multiple cross sections were analyzed to evaluate variations in flood depth and width across different water levels. The result revealed that flood depths increased from 5.6 m to 9.5 m and up to 12 m with corresponding flood widths expanding 200 m to 1150 m. All the river cross section-maintained flow conditions. The study intends to evaluate the possible effects of flood simulations on diverse land uses and vital infrastructure for varying return times. The results should highlight the effectiveness of combined geospatial and hydraulic modelling in locating flood-prone regions and guiding focused mitigation techniques for better reservoir management