Seleshi, Yilma (PhD)Asfaw, Biniyam2018-07-192023-11-112018-07-192023-11-112016-06http://etd.aau.edu.et/handle/12345678/9393Storm water drainage problem is one of the major challenges facing many countries in Ethiopia in general and kemise also faced the problem. So, the study focuses on the assessment of storm water drainage system in Kemise town using statistical analysis, GIS and other material. A statistical analysis was applied to analyze the existing condition system and to analyze the peak discharge for the town and to fix the diameter of the pipe .GIS software was used to delineate water shed by combining DEM and aerial photograph. Based on primary and secondary data collected, the problems in the areas are categorized as construction, management and design problem. The method used to investigate management problem is direct field data collection and site visit but the construction problem is analyzed using field survey as well as comparison of design with what is implemented in the ground. Design of the study area is evaluated by redesigning of the system using the computation method used in ERA drainage design manual. Design of storm drainage system evaluated in this thesis includes hydraulic performance for existing situation by using manning‟s and fixing new size of reinforced concrete pipe for existing and proposed area. Based on the result of this thesis the drainage system is insufficient at different area and Most of the stations of the catchments were investigated that required construction of additional storm drainage system and its existing coverage and its proposed based on assessing and hydrologic and hydraulic calculation of this study the existing drainage convening capacity is only 19% at different catchment and the other 81% of new drainage system is required for different catchment at existing and proposed. Finally, appropriate mitigation measures were proposed for required 81% of new drainage system in order to serve the area from different negative effect and drainage structures for the future purposes sustainably. Additionally managing and improper construction alignment problem for the existing system were investigated and to avoid this problem periodic cleaning and modification of slope is recommended. Key words; Major problems, Assessment of storm drainage system, statistical analysis, Hydraulic performance, Mitigation measures, Kemise.enMajor ProblemsAssessment of Storm Drainage SystemStatistical AnalysisHydraulic PerformanceMitigation MeasuresKemiseThesis