IJETSI

Title: DAM BREAK MODELLING BY USING HEC-RAS AND HEC-GEO RAS: A CASE STUDY OF DIRE EMBANKMENT DAM ON LEGADADI RIVER
Authors: Segni Wandimu Gudeta
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Segni Wandimu Gudeta: Department of Hydraulic and Water Resources Engineering, Jimma Institute of Technology Jimma University, Jimma, Ethiopia

References [1] Addis Ababa Water and Sewerage Authority, 2016 ‘Legadadi and Dire Dam Rehabilitation Project Final Design Report‘. [2] Derdous, O., Djemili, L., Bouchehed, H., Tachi, S.E., 2015 ‘A GIS based approach for the prediction of the dam break flood hazard - A case study of Zardezas reservoir “skikda, Algeria’’, Journal of Water and Land Development, 27(1), pp. 15–20. [3] Ekaningtyas, L. R., 2017 ‘Flood Inundation Prediction of Logung River due to the Break of Logung Dam’, Journal of the Civil Engineering Forum, 3(2), p. 331. [4] FEMA, 2013 ‘Federal Guidelines for Inundation Mapping of Flood Risks Associated with Dam Incidents and Failures. [5] Joy, D., 2016 ‘Dam Break Analysis Using HEC-RAS', International Research Journal of Engineering and Technology, 3(5), pp. 308–309. [6] Sharma, P., 2016 ‘Dam Break Analysis Using HEC-RAS and HEC-GeoRAS – A Case Study of Ajwa Reservoir’, Journal of Water Resources and Ocean Science, 5(6), pp. 108– 113.
Abstract: Dam is essential hydraulic structure constructed across river for the purpose of creating reservoir to store water. The study focused on piping dam breach analysis of Dire dam located in Oromiya region. The analysis was carried out through HEC-RAS and HEC-Geo RAS model integrates with GIS. Unsteady flow simulation was done in HEC-RAS model. HEC-Geo RAS model prepares geometric data of Legadadi River in GIS. Input data for HEC-RAS model, dam breach parameters were calculated by using the empirical method of Froehlich 2008. The breach parameters value of breach bottom width (B), breach formation time (tf), and breach side slopes (bss) for piping failure mode were 45.98 m, 0.75 hr, and 0.7. The maximum breach outflow discharge 7712.10 m3 /sat the dam location due to piping failure was found through unsteady flow simulation performed in HEC-RAS model.

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