Flood inundation mapping under climate change scenarios in the Boyo watershed of Southern Ethiopia

Abstract This research aims to map flood inundated areas under changing climate in the Boyo watershed of Southern Ethiopia. A semi-distributed physically based Hydrologic Engineering Center-Hydrologic Modeling System (HEC-HMS) and Center-River Analysis (HEC-RAS) were used simulate events maps, respectively, for scenarios. The bias-corrected data four models baseline (1976–2005), mid-term (2041–2070) long-term (2071–2100) cycles RCP4.5 RCP8.5 50- 100-year return period generated from future streamflow data. HEC-RAS model was inundation depths events. result exhibited that average annual rainfall maximum minimum temperatures catchment will increase with an runoff. severity floods would Approximately, 193 ha study may be flooded having a 100 years scenario period, which is extreme case. benchmark reduce risk management floodplains this watershed.