Flood zoning and simulation of river hydraulic behavior using HEC-RAS software

Floods are one of the most common natural disasters, known as a major catastrophe, affecting various parts of the world, even in developed countries, which cause billions of dollars in damage to infrastructure annually and hundreds of lives. They lose themselves. Preparation of flood zoning maps for different return periods is one of the common methods used to show the potential for flood hazards. One of the basic solutions to control and reduce the destructive effects of floods is to identify floodplains in watersheds. The purpose of this study is flood zoning and simulation of hydraulic behavior of Dafeh sub-basin in Rafsanjan watershed using HEC-RAS software. The study area of ​​Defeh sub-basin is located in Rafsanjan region in the geographical coordinates of 55 1818 55 to 39 191957 east longitude and 151 2222 29 to 38 3939 عرض north latitude. The circumference of the region is 746.6 km, the maximum and minimum altitudes of the region are 4499 and 1450 meters, respectively. In this study, Google Earth and GIS software to prepare a digital model of altitude and then after sorting and formatting the input data of the HEC-RAS model for flood zoning and simulation of river hydraulic behavior And management scenarios were used. The results obtained in this study show that the amount of discharge and volume of floods from rainfall with a return period of 25 years equal to 68.1 cubic meters per second and 1150.6 thousand cubic meters.