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- Title
THE INFLUENCE OF LAND USE AND LAND COVER CHANGE ON STORMWATER RUNOFF IN A HIGHLY URBANIZING CATCHMENT (A CASE OF MSIMBAZI CATCHMENT IN DAR ES SALAAM CITY).
- Authors
Mkilima, T.
- Abstract
A hydrological pattern of any catchment is highly affected or determined by how land is being used within the particular catchment. Other determining factors may include but not limited to climatic condition as well as the catchment size. This study investigated the potential effects of land use/land cover changes on stormwater runoff in a highly urbanizing catchment, for a case of Msimbazi catchment in Dar es Salaam, Tanzania. Three different years (1998, 2009 and 2018) were selected and as case studies. The extreme 100-year rainfall event of December 2011 was used to develop the meteorological model in the Hydrologic Modeling System (HEC-HMS). The ArcGIS and HEC-Geo HMS tools were used to prepare the datasets for the event-based rainfall-runoff simulation in HEC-HMS. The extent of land use/land cover changes with time was investigated using Supervised approach in ArcGIS. The general modelling process based on the Soil Conservation Service (SCS) Curve Number (CN). From the analysis results it was observed that, the land surface cover in the catchment has been rapidly changing; for instance, developed low intensity category coverage changed from approximately 61.7% to 16.8% in 2018. The change in terms of land surface cover translates to an increase of about 23.08% from 1998 to 2018 of the computed peak discharges. The peak inflows for all the detention basins were observed in the extreme event of 20 December 2011. The designed detention basins are capable of capturing up to 65% of runoff to make the catchment safe from the flooding incidents.
- Subjects
DAR es Salaam (Tanzania); STORM water retention basins; LAND use; LAND cover; WATERSHEDS; HYDROLOGICAL databases
- Publication
Journal of Geography & Environmental Management, 2021, Vol 63, Issue 4, p26
- ISSN
1563-0234
- Publication type
Article
- DOI
10.26577/JGEM.2021.v63.i4.03