Impact Of Flood In Urban Drainage System And Identifying Cause Of Storm Water Flooding - The Case Of Gurd Shola Area

Disasters like flooding have changed dimensions of urban areas. The urban flooding in cities is mainlyrnin the form of flash floods and water logging of streets due to high intensity short spell rainfall. But thernlevels of damage to these disasters have increased over time in the urban areas because of increasedrnrainfall runoff volume. However, it is clearly evident that different level of exposure and differentrnextents of flood hazard characteristics vary the urban flood risk nature from city to city. Addis Ababarnis one of the fastest growing cities in Africa and urbanization is known to increase the amount of runoffrngenerated from the urban catchment. Due to urbanization and lack of proper design and management,rnthe city’s’ transport infrastructure has experienced frequent flooding.rnThe objective of this research is to identify the drainage condition of Gurd shola area, which is one ofrnthe villages found in in Addis Ababa with respect to the hydrology, hydraulic and operation andrnmaintenance features. In this study, the impacts of important factors on flooding in urban drainagernsystem of Gurd Shola area were evaluated using primary and secondary data collection systems. Forrnthe analysis of rainfall data and their probability distribution Gumbel and log Pearson’s III distributionrnstatistical methods were used. In order to see the impact, runoff coefficient for different time intervalrnyear 2004 and 2019 was used and also the rainfall intensities for different duration was analyzed for arnperiod of 1988-2017.rnThe rational formula and Bentley Civil Storm software were used to compute the peak flood estimationrnfor (T= 10 years) and to determine the hydrological peak flow respectively. The analysis from thernfrequency distribution indicates that Gumble Extreme Value distribution was to be a good fit. Thernfinding of the study shows that, the flooding problem mainly arises due to improper cleaning and stormrnwater management. Slops also should be clearly checked in order avoid unwanted storm waterrnaccumulation on the road surface.

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