Flood Hazard Assessment of the Bangshi River Floodplain using an Integrated 1D/2D Coupled Hydraulic Model

In the present study, flood hazard of Bangshi River, located in Savar Industrial Area Dhaka District, has been evaluated. The historical extent analysed from Landsat satellite images suggests that most parts study area were flooded during major events Bangladesh. flow data fitted with different analytical frequency distribution functions, and it is found Pearson III function best fits observed based on Chi-Squared statistical test. Then, model River as well surrounding floodplain was developed using HEC-RAS 1D-2D coupled hydraulic model. simulated an estimated 100-year 500-year return periods. analysis shows water level exceeds danger at nearby monitoring station years. area, devastating floods occurred years 1988 1998. maximum 9.9 m event 1988. also about 69% 58% 1998, respectively. roadways provide protection barriers western side for coming system unless road overtopped. result 68% 79% will be inundated periods, velocity period 2.31 m/s 4.52 m/s, duration same periods 32.5 days 48.95 days, depth, duration, maps can used any development activities within area. University Journal Earth Environmental Sciences, Centennial Special Volume June 2022: 167-186