Hydrological impacts of urbanization of two catchments in Harare, Zimbabwe

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dc.creatorGumindoga, W.
dc.creatorRientjes, T.H.M.
dc.creatorShekede, M.D.
dc.creatorRwasoka, D.T.
dc.creatorNhapi, I.
dc.creatorHaile, Alemseged Tamiru
dc.date2014
dc.date2016-11-01T13:39:37Z
dc.date2016-11-01T13:39:37Z
dc.date.accessioned2026-06-27T18:39:01Z
dc.descriptionBy increased rural-urban migration in many African countries, the assessment of changes in catchment hydrologic responses due to urbanization is critical for water resource planning and management. This paper assesses hydrological impacts of urbanization on two medium-sized Zimbabwean catchments (Mukuvisi and Marimba) for which changes in land cover by urbanization were determined through Landsat Thematic Mapper (TM) images for the years 1986, 1994 and 2008. Impact assessments were done through hydrological modeling by a topographically driven rainfall-runoff model (TOPMODEL). A satellite remote sensing based ASTER 30 metre Digital Elevation Model (DEM) was used to compute the Topographic Index distribution, which is a key input to the model. Results of land cover classification indicated that urban areas increased by more than 600 % in the Mukuvisi catchment and by more than 200 % in the Marimba catchment between 1986 and 2008. Woodlands decreased by more than 40% with a greater decrease in Marimba than Mukuvisi catchment. Simulations using TOPMODEL in Marimba and Mukuvisi catchments indicated streamflow increases of 84.8 % and 73.6 %, respectively, from 1980 to 2010. These increases coincided with decreases in woodlands and increases in urban areas for the same period. The use of satellite remote sensing data to observe urbanization trends in semi-arid catchments and to represent catchment land surface characteristics proved to be effective for rainfall-runoff modeling. Findings of this study are of relevance for many African cities, which are experiencing rapid urbanization but often lack planning and design.
dc.identifierhttps://hdl.handle.net/10568/77507
dc.identifier.urihttp://hdl.handle.net/123456789/161722
dc.languageen
dc.publisherMDPI
dc.rightsOpen Access
dc.sourceGumindoga, W.; Rientjes, T.; Shekede, M. D.; Rwasoka, D. T.; Nhapi, I.; Haile, Alemseged Tamiru. 2014. Hydrological impacts of urbanization of two catchments in Harare, Zimbabwe. Remote Sensing, 6(12):12544-12574. doi: https://doi.org/10.3390/rs61212544
dc.subjecthydrological factors
dc.subjecturbanization
dc.subjectimpact assessment
dc.subjectcatchment areas
dc.subjectwater management
dc.subjectwater resources
dc.subjectwater table
dc.subjectland cover change
dc.subjectremote sensing
dc.subjectsatellite imagery
dc.subjectrain
dc.subjectrunoff
dc.subjectmodels
dc.subjectwoodlands
dc.subjectdeforestation
dc.subjectstream flow
dc.subjectsoils
dc.subjectinfiltration
dc.titleHydrological impacts of urbanization of two catchments in Harare, Zimbabwe
dc.typeJournal Article

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Instituto Internacional para el Manejo del Agua (IWMI)