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Evaluation and Optimization of Low Impact Development Design for Sustainable Stormwater Management in a Changing Climate

Author(s): Yasir Abduljaleel; Yonas Demissie

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Keywords: Urban watershed; Low impact development; Stormwater management; Storm Water Management Model (SWMM); Climate change

Abstract: The intensity and frequency of extreme storms are increasing due to climate change, posing challenges to stormwater management in highly urbanized areas. Without an adequate and appropriate stormwater system, the increased storms and associated floods continue causing significant damage to infrastructure and loss of life. The Low Impact Development (LID) has become an emerging alternative to the traditional stormwater system to manage the increased stormwater. This study evaluates and optimizes different combinations of LIDs to minimize flows from catchment under past and future storm conditions. The Storm Water Management Model (SWMM), forced by observed and downscaled precipitation from CMIP6, was used to simulate the runoff and apply the LIDs. The results show that permeable pavement alone can reduce the total and peak flows by 52.5% and 31.25%, respectively. Whereas combination Rain barrel, Bio Retention, and Infiltration Trench showed the highest reduction in total flow (65%) and peak flow (51.25. The study demonstrates the identification of the best LID mixes with conventional stormwater management will assist engineers and decision makers to manage the future runoff that was expect to increase by 26.3% over 2040 as compared to the present time.


Year: 2021

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