Performance Assessment Of Road Drainage Structures And Proposed Mitigation Measures The Case Of Daleti-odagodere Gravel Road In Benishangul-gumuz Region

This thesis presents results of the assessment of drainage structures; performance on Daleti-rnOdagodere gravel road in Benishangul-Gumuz region and proposed mitigation measures.rnMitigation measures were proposed based on ERA drainage design manuals 2002 and 2011 forrnLow Volume Roads.rnDescriptive and exploratory methods of research were used for this thesis work. Field visits of therncatchment area that contributes runoff to the drainage structures were made and the existingrnproblems were described.rnThe necessary secondary data for this research are land cover map, topographical map, geologicalrnmap, and feasibility study of the road before construction. The primary data are photographs thatrnshow the existing drainage structures conditions, flood level marks and information that isrngathered from the residences and road desk office about the performance of the drainagernstructures during the rainy season. Hydrological analysis was carried out by using Rational andrnSCS equations. Hydraulic parameters are determined by using Manning’s equation.rnStructural and hydraulically failures of drainage structures and roadways were investigated.rnMoreover, stations of the road were investigated that require construction of minor drainagernstructures but not constructed.rnSuitable mitigation measures were proposed in order to make the road and drainage structuresrnserve for the intended purposes sustainably. New drainage structures were proposed where theyrnare lacking in the existing system.

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