Modeling and Analyses of Urban Flooding in Bole Subcity System Performance and Evaluation of Possible Improvements Using Ep Swmm5

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dc.contributor.advisorNugussie, Agizew(PhD)
dc.contributor.authorHassen, Nejib
dc.date.accessioned2018-07-24T06:28:10Z
dc.date.accessioned2023-11-11T08:32:08Z
dc.date.available2018-07-24T06:28:10Z
dc.date.available2023-11-11T08:32:08Z
dc.date.issued2016-11
dc.description.abstractThe runoff generation in Bole area Addis Ababa is increasing due to a combination of larger rainfall intensity and more impervious areas. As a consequence several properties have been affected by basement flooding during heavy rainfall events when the network was severely overburdened. This thesis aims to study the management of storm water excess in order to evaluate how drainage networks could be improved to avoid basement flooding events. The investigation is focused on the identification of critical parts of the drainage system under risk of flooding, along with the feasibility analysis of different potential solutions to handle the excess of storm water. SWMM is a dynamic rainfall-runoff simulation model used for single event or long-term (continuous) simulation of runoff quantity and quality from primarily urban areas. The runoff component of SWMM operates on a collection of sub catchment areas that receive precipitation and generate runoff and pollutant loads. The routing portion of SWMM transports this runoff through a system of pipes, channels, storage/treatment devices, pumps, and regulators. SWMM tracks the quantity and quality of runoff generated within each sub catchment, and the flow rate, flow depth, and quality of water in each pipe and channel during a simulation period comprised of multiple time steps. The simulations confirm the insufficient capacity of the system to handle heavy rainfall with one third of the nodes flooded during a 10-year return period rain. With 67% of concrete pipes running two third of pipe during 5-year return period rain and a 32.6% of nodes flooded during a 10-year return period rain can be affirmed that the drainage system situation is critical. The total runoff from whole sub-catchments by SWMM is 3.47m3/sec, whereas by rational method is 3.14m3/sec. The total simulation accuracy of the runoff and network systems as assessed by statistical methods, were RNS, =0.622, RE=0.098, and R2=0.935. Therefore, the effectiveness of different sustainable drainage systems (grass, ditches, detention ponds and gravel tanks) and enlargement of pipe diameters were evaluated for this case study. Continuous rains have shown to be the worst case rainfall scenario in this drainage system. Generally it can be concluded that road surface drainage of the study area found to be inadequate due insufficient road profile, insufficient drainage structures provision, improper maintenance and lack of proper interconnection between the road and drainage infra-structures thereby resulting flooding problems in the area.en_US
dc.identifier.urihttp://etd.aau.edu.et/handle/12345678/9894
dc.language.isoenen_US
dc.publisherAddis Ababaen_US
dc.subjectGeneration in Bole area Addis Ababaen_US
dc.titleModeling and Analyses of Urban Flooding in Bole Subcity System Performance and Evaluation of Possible Improvements Using Ep Swmm5en_US
dc.typeThesisen_US

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