A Feasibility Study of Stormwater Management for a Campus University in Semenyih, Malaysia

Sustainable stormwater management is one of the techniques used for managing water runoff as a measure to minimize the consequences of peak discharges, extension of flooding, and deterioration of surface water due to land use changes. The best management practices (BMPs) of sustainable stormwater management endorsed a more effective and environmentally storage-oriented approaches which focus on detention, retention, and recharge in terms of water quantity and quality control. This study has established the information on hydrological parameters and estimations of the existing water conveyance system in a campus university in Semenyih, Malaysia. Based on the hydrological analysis, a thorough review into the BMPs has been carried out. The study presents a proposed stormwater management solution towards the prevention of flash flood in the study area. Wet detention pond has been selected as the BMPs and introduced in the proposed stormwater facilities for quantity and quality control measures. The hydraulic analysis were performed on the proposed solution by referring to the guidelines depicted as in Urban Stormwater Management Manual for Malaysia (MSMA). From the results, the proposed wet detention pond can cater with a maximum storage of 18,579 m³. The pond can handle a surge of floodwater to prevent the backflow of water in the existing drainage system. The two outlet structures of the wet detention pond are able to drain the stormwater runoff at a peak discharge rate which is lower than the pre-development peak discharge rate. The results also revealed that the proposed solution is adequate to cater for the 100-year average recurrence interval (ARI) storm events.