Abstract: Fluvial floods are the most prevalent type of flood worldwide. To create a hydrodynamic model in the Hydrologic Engineering Centre-River Analysis System (HEC-RAS), among the different accessible software, open-source software HEC-RAS is the most popular and widely used worldwide. This review intends to investigate the many applications of HEC-RAS software for the building of a one-dimensional hydrodynamic model for study in the Shetrunji River, for which geometric data is the primary input into the software. The primary goal of this work is to investigate and compare the effectiveness of open-source DEM. Every river hydraulic model that models water level and discharge employs river cross sections as its major input. River cross-section measurements in the field are time-consuming and costly. The river cross-sections obtained by both DEMs were used to simulate the severity of a flood in the Saurashtra area of Gujarat's downstream Shetrunji river basin. The outcome of the simulation will be used to assess various hydrological parameters. Hydrological modeling is being conducted to demonstrate the feasibility of flooding, which will ultimately lead to the development of an action plan and the transmission of information to local authorities in the surrounding areas.

Keywords: Hydrodynamic Model, DEM, ALOS JAXA, Shetrunji river, Cross-section Delineation.

| DOI: 10.17148/IARJSET.2023.10575