Hosana H. Ndlovu and Julius M. Ndambuki
land-use change, urbanisation, storm water management model, effect, management, hydrology
Recently, the City of Tshwane was involved in large scale upgrades of both roads and stormwater infrastructure. These upgrades usually take place in major business corridors and areas that are closer to public transport corridors. The city has clear and specific trends of locating non-residential land-uses along main arterial routes. The indiscriminate and uncontrolled land-use changes and conversion of dwelling houses for business purposes, contrary to sound town planning principles, was identified as a problem. Scenario analysis was used to predict possible future land-use changes in the study area in line with current land management practices. The Storm Water Management Model (SWMM), which is a dynamic rainfall-runoff simulation model, was used to simulate runoff for the different land-use scenarios. Results indicated an increase of 15% in peak discharge and a significant increase in flow volumes and flooding.
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