Urbanization Impact Assessment on Stormwater Drainage Performance of Sebeta Town
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Date
2020-01
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Addis Ababa University
Abstract
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.
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Keywords
Stormwater, Low Impact Development, Urban drainage