Integrated Approach for Flood Modeling using Arc GIS, HEC-GeoRAS – A Case Study on Purna River of Navsari District of Gujarat State

This research work indicates the advancement of flood modeling using Arc GIS and HEC GeoRAS software in the field of water resources engineering and flood management. The methodology is applied to Purna River, Navsari district, Gujarat, India. In this research, we have used satellite, topographic, contour map, hydraulic and hydrologic data for flood modeling. In this paper first part of the methodology followed by preprocessing data involved to develop DEM (Digital Elevation Model) using contour data, Georeferencing, and Shapefile in Arc GIS software. After that, these all geometry data are imported into HEC RAS through HEC GeoRAS interface in ArcGIS environment. This research demonstrates the flood mapping approach for disaster authorities by modeling using past data required in HEC-RAS. This methodology is also used to develop flood risk map in Arc GIS environment for the study area. From this research, we can conclude that with GIS technology combine with the computed model the flood mitigation is very beneficial for disaster management after mapping the extent of the flood. Citation: Azazkhan I. Pathan, Dr. Pankaj J. Gandhi, Dr. P. G Agnihotri. "Integrated Approach for Flood Modeling using Arc GIS, HEC-GeoRAS – A Case Study on Purna River of Navsari District of Gujarat State." Global Research and Development Journal For Engineering [ERICE - 2019], Dr. S & S.S. Ghandhy Government Engineering College GTU, (February 2019) : pp. 338 - 342.