Performance Assessment Of Road Drainage Systems Of Burayu Town

The objective of the study is to assess the Performance of Drainage Systems of Road at BurayurnTown Administration. The study employed both primary and secondary data collection. Thernprimary data collection were observation (field visit), Interview, and photographs that show thernexisting drainage structure conditions and information that were gathered from the residentsrnabout the performance of the drainage structures during the rainy season. The secondary datarnsources were land cover map and geological map. Hydrological analysis was carried out byrnusing Rational and SCS equations. Hydraulic parameters were determined from the designrndocuments data during construction and from the construction sites by measuring thernparameters where the structures are constructed by using Manning’s equation and GIS was usedrnfor watershed delineation. The findings of the study that were investigated includes: In most partrnof the town, runoffs run over road surfaces were due to soil erosion, flatness of the ditch channel,rnpoor waste management system and lacking of the drainage structure at some station. As there isrnno adequate provision for garbage container in the town, residents dispose wastes in to therndrainage channels, culvert, open spaces, and rivers/ streams. The drainage channels are filledrnwith or blocked by silt and garbage, the blockage of drainage structures is due to flat areas andrnsiltation of drainage system which leads to failures on roadways. The computed discharge valuesrnwhich were determined by both SCS methods and rational method were compared by dividingrnthe watershed area according to their area of application. At station 16+200 the dischargesrnwere computed by SCS method for 60ha and also, computed by rational method by divided 60harninto two parts 30ha/0.3km2 and compared the results. The hydraulic calculation was carried outrnat station 16+200 by using Manning equation and checked by trial and error. Therefore, therndesign and check discharges at station 16+200 are 17.0m3/sec and 21.5m3/sec respectively.rnTherefore, new drainage structure will be needed at station 16+200. Therefore, this studyrnrecommends improvement in the integration of road and drainage structures serve for thernintended purposes sustainably to the stakeholders.rnKeywords: Drainage Structure, Urban Road, Flooding, Blockage, Maintenance

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