This study focuses mainly on the flood mapping and proposes mitigation measures byrnusing the application of arc-Gis based hydrologic model (HEC-HMS) for estimation ofrnpeak discharge and hydraulic modeling (HEC-RAS) for estimation of water surface profilernfor different return periods. The DEM (30m*30m) of the study area was used to extractrnthe physical characteristic of a watershed using Geo-Spatial Hydrologic modelingrnextension HEC-GeoHMS. The satellite data analysis was used in the calibration andrnvalidation of the Awash Belo flooded area. The six indices were selected in water arearnextraction from Landsat-7 Geotiff like NDWI, AWEI, NDVI, NDMI, WRI, and NDMI.rnAmong them, NDWI was the best fit with simulated flow and used for both calibrationrnand validation for events of 9/3/2001 and 8/25/2001 respectively.rnFinally, different mitigation alternatives were proposed to take corrective measures forrnAwash Belo flood-damaged area. The appropriate mitigation measure for the Belo floodrnplain was selected based on three main criteria after their design like flood risk,rnEnvironmental impact, and balance of the two criteria. Even if, it was difficult to decidernthe efficient alternative because some alternative contradicts each other, the multi-criteriarndecision analyses were used. The two-stage channel modification was best in the riskorientedrndecisionrnbutrnleastrninrnenvironmentallyrnorientedrndecisions.rnThernone-stagernchannelrnrnmodificationrnwasrngoodrninrnenvironmentalrnimpact-orientedrnwhereasrnleastrnpreferredrninrnriskoriented.rnThernlevee inrncombination withrnchannelrnmodificationrnwasrngood inrnenvironmentalrnrnorientedrnbut,rnlessrninrnrisk-oriented.rnThernbalancernofrnallrnenvironmentalrnandrnfloodrnriskrngivesrnrnhigherrnpriorityrnforrnleveernconstructionrnand lessrnpriorityrnforrnchannelrnmodification.rnrnrnrnThernpeakrndischargerndevelopedrnatrnupstreamrnfloodrnplainrnwasrn82.8rnandrn100rnmrn/s for 50 andrn100 years respectively. The area inundated by this peak was 500.6 ha and 505 ha for 50rnand 100 years return period respectively without any protection measure. The area falls torn52.27 and 57.28 hectares when the levee construction mitigation measure was applied forrn50 and 100 years return period. Scenario analysis confirms the superiority of leveernconstruction to other proposed alternatives with the highest rated value of 0.733 as well asrnstrong weakness of two-stage channel modification with the least preferred rated value ofrn0. Although increasing the size of the channel or decreasing its roughness can lead to arnreduction in flood level because of additional channel capacity, channel modification couldrnalso have a negative effect such as increasing inflow velocity and stream power. Therefore,rnfrom the different alternatives, the construction of a levee has been proposed as the bestrnalternative remedial measure to protect the flood from the damaged area.