Performance Assessment of Storm Water Drainage Systems (Case study of Debere Berehan Town)

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Addis Ababa University


A drainage system degrades by multiple factors and its performance reduces in time. Since such infrastructure play a key role in preventing urban floods, their performance should be monitored and quantified. Debere Berehan town is one of the rapidly expanding and selected as factories center now a day in Ethiopia. Unfortunately, street flooding and over topping drainage system problems are occurring at the rainy season in a town. Because of flooding the area are becomes water soaked soil which difficult to move easily for Transport. The objective of the study is to assess the Performance of drainage systems of Debere Berhan Town. The study employed both primary and secondary data collection. To achieve the specific objective SWMM5 Model and LID control used as method. Model calibration and validation were done and The performance of SWMM5 was carried out using Coefficient of Determination (R Performance Assessment Of Storm Water Drainage Systems (Debere Berehan Town Case Study) Page ii 2 ) ,The Nash-Sutcliffe coefficient (NSE) and Relative Error (RE).According to simulation almost all of the modeled drainage systems are flooded for each event scenario rain. For T-25 event 35% of closed rectangular channel and 32.5% of Open rectangular channel of the Study area were flooded. More over the total average flow1.64 m 3 /s and total volume to outfall 87.75*10 3 m 3 were occurred from all 17 sub catchments. After LID control provided the discharge values were lesser than that before LID provided. In comparison to the current conditions, bio-retension reduced total outfall volume by 46.2% and average peak flow by 25.4%, the infiltration trench scenario as well reducing total volume to outfall 34.4% and average peak flow by 23.7% as compared to current conditions. In general, the LID results shows bio-retension are best alternative to minimize the peak flow rate and total volume of the area. And applied to the selected area 3.6 ha at S8, S9, S10, S11, S13, S14, S15, S16 and S17 catchments were recommended.



urban drainage, SWMM5, model calibration and verification, LID control