ASSESSMENT OF URBAN DRAINAGE SYSTEM PERFORMANCE AND MODELING OF SUSTAINABLE STORM WATER MANAGEMENT

Abstract

The drainage system is a crucial factor to consider in the development of an urban drainage plan. This study aims to identify the critical problems with a drainage system, evaluate the hydraulic performance of stormwater drainage, and assess alternative measures to mitigate drainage problems. The storm water management model and low impact development control were employed in the study. Storm water management model simulated area of the study subdivided to three outlets of the total area of sub catchment of 48.84ha joined to drainage system infrastructure of 26 nodes with 13 sub catchment. SWMM model was results were checked with the coefficient of determination (R2) =0.88, the Kling-Gupta Efficiency (KGE) =0.82, and Relative Error (RE) =13.7%. According to the model results, the total sub catchment peak runoff is 6.3 m3/s. The Low Impact Development (LID) control was used to reduce the peak runoff overflow and choose the best alternative on the project's outlet one, the total was reduced by using the all-sub-catchment Using bio retention, permeable pavement, infiltration trench and rain garden. bio-retention reduced total outfall volume by 14.83 percent, with the infiltration trench reducing total volume to outfall by 36.11percent, permeable pavement reducing total outfall volume by 25.36 percent, and Rain Garden reducing total outfall volume by 48.15 percent. In conclusion, the implementation of Low Impact Development (LID) techniques such as rain garden cells has proven to be an effective method of managing water in urban areas. The significant reduction of outfall volumes by 30.63% in the study area is a clear indication of the success of LID implementation. It is recommended that local governments and urban planners shall work to incorporate the selected LID techniques into their drainage systems to manage water effectively and sustainably.