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This study presents the preparation of floodwater depth, the velocity of the flood, and water surface elevation profile with the application of unsteady flow 2D Hydrodynamic models and GIS. Flood frequency analysis is used for the prediction of peak flow. The water depth up to 1 m inundated a large amount of area of 52.5134 km 2 , 52.4756 km 2  and 52.4403 km 2  for a 10-, 100-, and 1000 years return period respectively. Much amount of inundated area covered with a velocity value up to 0.15 m/s in all flood events, which is 53.207, 52.656, and 52.064 km 2  for flood events of 10, 100, and 1000-year respectively. The highest water surface elevation in the 10, 100, and 1000-year flood events was observed between 1785 and 1787 m with an inundated area of 58.806, 58.843, and 58.827 km 2  respectively. Finally, the result of this study is useful for early warnings, municipal planning purposes, emergency action plans, flood insurance rates, and ecological studies in the research area.

Flood inundation modeling using HEC-RAS: the case of downstream Gumara river, Lake Tana sub basin, Ethiopia