Analysis of the Causes and Consequences of Flash Flood and Design for Flood Resilient Neighborhood in Kebelle 02 of Bishoftu Towon
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Date
2018-10
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EiABC
Abstract
Natural hazards are the most known catastrophes on the planet earth. They cause devastation on property and loss of human life. Flood is one of the major natural hazards. According to the Intergovernmental Panel on Climate Change prediction, in the coming years the frequency and intensity of floods will increase at an alarming rate. The impact of flooding is very severe in developing countries. As a developing country, Ethiopia is one of the victim of natural hazards, of which flood is the prominent one. The country experiences two types of floods: river floods and flash floods. This research focused on flash floods that occur seasonally in Kebele 02 of Bishoftu town. The study has set objectives to identify major driving causes and effects of flash flooding, to generate maps of urban flood barrage by using data from peak runoff events, explore the coping strategy used by local residents and to propose an appropriate strategy for flood resilience in the study area. In order to meet the intended objectives, the present research followed descriptive and explanatory research methodology. The research employed field observation, survey, interview, document review and case study. The data obtained through questionnaire, interview guides and checklists were analyzed using simple descriptive statistical methods such as percentages, charts, and graphs. The qualitative analysis was presented through direct quotes followed by explanation using different spatial mapping. The study identified that: encroachment of fragile ecosystem (quarry at upper catchment), new developments, prevalence of impervious surface materials, poor solid waste management, lack of vegetation on the mountains and plain areas are the major driving factors of the flash flood in the study area. These driving factors have infrastructure and household equipment damage, health related effects due to contamination of edible items and water pollution and flood induced economic crises on the residents of the case site. Finally the study recommends appropriate strategies to bring flood resilience in the case site such as: sustainable drainage system, storm water detaining tanks, bio-retention basin, rehabilitation of the quarry and enhancing the local coping strategy of the residents.
Keyword: Ethiopia, Bishoftu, flashflood, coping strategies, Resilience, sustainable drainage system
Description
Thesis submitted to School of Graduate Studies of Addis Ababa University in the partial fulfillment of the requirements for the degree of Master of Science in Environmental Planning and Landscape Design
Keywords
Ethiopia, Bishoftu, flashflood, coping strategies, Resilience