AN EVALUATION OF FLOOD MITIGATION USING SWMM MODEL IN A RESIDENTIAL AREA IN MUAR, JOHOR
Main article
Abstract
Flood risk has been on the rise over the years globally. In Malaysia, 10% of the land is susceptible to flooding. The Muar River basin in Johor is one of Malaysia's major rivers prone to severe flooding. Hence, it is crucial to
conduct an evaluation of flood mitigation measures on developed sites periodically to minimize the risk. This study aims to offer an assessment of the flood mitigation measures at a residential area in Muar, Johor. A storm
water management model by EPA-SWMM is adopted to analyse potential flood issues in the area. During the analysis, the stormwater runoff behavior associated with the rainfall precipitation and the land uses of the study site was analysed and discussed. The event-based simulation would be based on the most severe hourly rainfall precipitation from year 2020 to 2022. The simulation outcome showed signs of flooding at the study area under 2 hours of consecutive rainfall averaging 60mm/hr, and with the inclusion of the proposed solution, results showed improvement of the storm drainage network in flood mitigation capability. The improvement saw a decrease in bottleneck stormwater drainage utilisation from maximum capacity to about 80% under the most severe stormwater runoff volume.
