Floodplain Mapping Using Hydraulic Simulation and Geographic Information System

Objectives- A flood is a strangely high stage in river generally, the level at which overflows its banks inundates adjacent area. Flood occurs due to intense rainfall, dense population, industrialization, illegal settlement along riverbanks, bank erosion, tide, and urbanization, it causes harmful damage human beings properties. It can be taken care of by adopting risk measures. One measures development inundation maps. Hence current study, maps are developed with integration GIS HEC-RAS Bhīma River reach Maharashtra, India. Methods: In this using series annual peak discharges, flows were estimated for different recurrence intervals. Inundated areas marked represent 25 years 100 return periods HEC-RAS, ArcGIS handling spatial data, HEC-GEORAS interfacing between ArcGIS. Simulation 2, 5, 10, 25, 50, 100-year done, have been 100-years reoccurrence interval. Findings:The analysis on left right has done water surface elevations generated from model. The significant findings revealed that representing east side more vulnerable spills than west river. flooded 32.4 km2 43.82 25-year intervals, respectively. Generally, study urban agricultural downstream susceptible flooding. Novelty: map will help local authority effective decision-making disaster management flooding situations, especially River. Obtained depths decide necessity structural reduce deteriorating effects Keywords: Inundation map; frequency; DEM; Sensitivity analysis; Return Period;