Flood Damage Analysis For Teji Areaillu Woreda

Flooding is one of the most common, wide-reaching, and destructive natural perils,rnaffecting, on average, approximately 250 million people around the world each year. It isrnalso common in Ethiopia during the rainy season between June and September. Most ofrnthe flood disasters in Oromia are associated with rivers that overflow and burst their banksrnsucceeding heavy rains and inundated lowlands. Flooding of the upper basin andrntributaries of Awash River affected 14 peasant’s associations (Pas) in Illu, Sebeta Awas,rnand Ejere woredas of southwest Shewa zone. The flood was reported to have affected arntotal of 14,790 people out of which 2,052 people were displaced and inundate along thernriver banks in lowland plains. The objective of the study is to quantify and estimate therndamage of flooding on the economy in the Illu Woreda Teji Area using the HEC-FDArnmodel. Adopting HEC-GeoHMS Arc-GIS extension physical characteristics of arncatchment is obtained from the study area digital elevation model. Using the study arearnrainfall/meteorological data/ HEC-HMS model computes peak flow for different returnrnperiods near the outlet of the river catchment. Flood plain mapping near the Teji River wasrngenerated depend on the peak flow of the river for different return periods by the HECRASrnmodel,rnArc-GIS tornthernspecialrndatarnprocessingrnasrnwellrnasrnHEC-GeoRASrntornlinkrnArcGISrnwithrnHEC-RAS.rnDependingrnonrnthernHEC-RASrnresultrnhydraulicrnmodel,rnapplyingrnthernrnHEC-FDArnmodel,rnnumericallyrnfloodrndamagesrnarernestimated.rnThernfloodrnplainrnarearnacrossrnrnTejirnRiverrngeneratedrnforrn2, 5, 10, 25, 50, 100,rn200rnasrnwellrnasrn500rnreturnrnperiodsrnwerern308,rnrn422,rn459,rn507,rn535,rn574,rn598rnasrnwellrnasrn622rnharnconsecutively.rnInrnthernend,rnfloodrndamagernrncostsrnwerernestimatedrnbyrnthernHEC-FDArnmodel.rnFromrnthernstudy,rnthernmainrnoutputrnisrnexpectedrnrnannualrndamagern(EAD).rnThatrnisrnEADrnisrnestimatedrntornbern2,962,832.59$(TwornMillionrnNinernrnHundredrnrnSixty-Two Thousand Eight Hundred Thirty-Two Point Five Nine Dollar).rnAdditionally using HEC-FDA model by assigning a levee the economic damage is reducedrnto 403.43$, and levee is proposed for flood plain management.

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