Nature Based Orainage Solution for Minmizing the Risk of Flooding in Nekemte City
| dc.contributor.advisor | Assefa, Alazar (PhD) | |
| dc.contributor.author | Feyisa, Nuywalif | |
| dc.date.accessioned | 2022-04-20T13:14:30Z | |
| dc.date.accessioned | 2023-11-08T11:26:12Z | |
| dc.date.available | 2022-04-20T13:14:30Z | |
| dc.date.available | 2023-11-08T11:26:12Z | |
| dc.date.issued | 2020-12 | |
| dc.description.abstract | In Ethiopia, the recent urban expansion and increment of impervious surfaces in high rainfall areas resulted in flooding and associated environmental problems. Nekemte city is one of the urban centers in the country facing the challenges associated with a high level of imperviousness and flooding. This study mainly focused on estimating the level of impervious surfaces and introducing nature-based drainage design solutions for sustainable stormwater management of the city by targeting water-resilient strategies for the future of Nekemte. Spatial data collected and processed by using ArcGIS for mapping & quantification of impervious surfaces eventually for calculating stormwater runoff generated from the most impacted watershed. None spatial data collected to understand the perception of local people about the situation of flooding using questionnaires, structured interviews, observation & focus group discussions. Published and unpublished documents from the municipality of Nekemte and planning institutes utilized for verification of both spatial and non-spatial data. The collected primary data analyzed statistically under SPSS version 20. The principal result of this research showed that factors enabling flooding problems are the sum of factors associated with impervious surface increments, intensive recurrent rainfall in the area, densification of settlements in the higher slopes, and inadequate drainage facilities for stormwater management. Based on this factor, the watershed that covers the area around Bake Jama and nearby neighborhoods estimated to be 201.06ha watershed area identified as the most impacted with 95.77ha of impervious surface coverage. The problem associated with imperviousness in this particular watershed can be reduced by retrofitting through the application of nature-based drainage solutions using the available open spaces and public realms. The study also developed watershed level strategies applicable in different parts of the city with similar flooding problems. Finally, the study recommended further assessment of the socio-economic aspect of flooding in the area to link the nature-based drainage solutions with more co-benefits for the local people affected by flooding. In this regard, the designed nature-based solutions as a blue green system have the potential for creating more jobs and income for the local people through water harvesting and urban farming schemes | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/31492 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Urban densification | en_US |
| dc.subject | land-cover | en_US |
| dc.subject | surface runoff | en_US |
| dc.subject | impacted watersheds | en_US |
| dc.subject | retrofitting strategy, | en_US |
| dc.subject | blue- green system | en_US |
| dc.title | Nature Based Orainage Solution for Minmizing the Risk of Flooding in Nekemte City | en_US |
| dc.type | Thesis | en_US |