Browsing by Author "Ejigayehu, Endrias"

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    Urbanization Impact Assessment on Stormwater Drainage Performance of Sebeta Town
    (Addis Ababa University, 2020-01) Ejigayehu, Endrias; Fiseha, Behulu (PhD.)
    Sebeta town is one of the rapidly expanding and selected as factories center now a days in Ethiopia. Unfortunately, street flooding and over topping drainage system problems are occurring at the rainy season in a town. The runoff generation in the study area is increasing due to a combination of larger rainfall intensity and more impervious areas. As a consequence several properties have been affected by flooding during heavy rainfall events. The objective of the study is to assess urbanization impact on stormwater drainage performance of sebeta town. To achieve the objectives SWMM model used as method and the total average flow 0.468 m3/s and total volume to outfalls 15.840*103 m3 were occurred from all 10 sub catchments. Model calibration and validation were done. The performance of SWMM model was carried out using coefficient of determination (R2), the nash-sutcliffe coefficient (RNS) and relative error (RE) the value obtained are 0.95, 0.91 and 12.95% respectively. In order to manage the stormwater LID control method is applied, after LID control provided the discharge values were lesser than that before LID provided. Finally, after the critical locations of overflow are identified, feasibility of suggested LID and their effectiveness in urban flood management are considered. The results of the study shows the urbanization have impact on drainage system. Generally it can be concluded that the drainage system of the study area found to be inadequate due to Inadequate size of the drainage system, improper construction of drainage canal and improper functioning of drainage network due to poor management this leads resulting damages to road surfacing material and flooding problems in the area. For proper disposal of storm water the existing drainage system must be properly managed and clean.