Physical Simulation to Determine the Surface Water Profiles and Point Velocities for The Flow Conditions of Sungai Bunus Stilling

Abstract

Over the years, Sungai Bunus has undergone hydrological changes and has become lower and narrower. Under a flood mitigation project, a flood diversion channel is proposed to reduce the volume of water in Sungai Bunus furthermore avoid the spill over into Sungai Klang and reduce flooding events in Kuala Lumpur city. This research describes the physical modelling of the flow state of the Sungai Bunus stilling basin. Physical model was constructed to verify the design criteria of the stilling basin that will be adopted for construction. Experimental work has been carried out both with and without piers under three specified discharges (52 L/s, 86 L/s and 121 L/s) and subsequently the measurement of the water surface height profiles and point velocities through the proposed system. Consequently, there are no significant differences of outcomes between the two circumstances. The results show that there is no overflow of water at discharges of 52 L/s and 86 L/s. The water level at the Sungai Bunus section starts to flood on one side of the package when the flowrate is 121 L/s both scenarios. All test conditions with and without piers shown that the point velocity measured at the beginning of the stilling basin (inlet) is much lower than the point velocity reported near the end of the stilling basin (outlet).