Generally, this study discovered that flooded areas in the upstream and middle parts of Fetam River are high as related to the downstream parts. Hydrological modelling has been used by several researchers in river and floodplain.
These flooded areas along the side of the Fetam River are 27.31, 24.85, 20.47, 17.34, and 13.78 km 2 for 100, 50, 25, 10, and 5 years return periods, respectively. The inundated areas were particularly high from Abaya Kalo, Achigi, and Denbun kebeles for all return periods. Built-up areas and agricultural fields are located along the river banks and are highly susceptible to flooding. These critical floods were damaging the areas around Fetam River, which is hazardous to social and economic growth due to loss of lives and destruction of properties. The flooded areas on Fetam River have been represented depending on 5% incidence peak flows for different reoccurrence eras using the HEC-RAS model, GIS for spatial data handling, and HEC-GeoRAS for interfacing among HEC-RAS and GIS. Using the past data on river banks and the release of earlier floods besides topographic data, maps were made to illustrate areas predictable to be covered with the flood for different releases. Flood inundation mapping is used to define the zones which are more susceptible to flood along the river when the release of a stream surpasses the bank-full stage along the river. Therefore, this study was conducted to map flood inundation areas along the Fetam River using GIS and HEC_RAS. One of these measures is inundating flood hazard areas. This can be minimized by giving attention to flood risk measures. Because the elevation is constant at every point along the section alignment at any given time step, the stage hydrograph will be identical at every point along the line, and a single stage hydrograph can be used to represent the whole section. Flood occurs due to rapid population growth, land degradation, and climate change, and causes harmful damages to human beings and properties.
0 kommentar(er)
