Abstract
Due to the rapid industrialization and urbanization, many studies on nonpoint source load reduction by SWMM. In this study, Sensitivity and uncertainty analysis for the SWMM Water Quality parameters, Max.Buildup, Rate Constant, EMC Coefficient and Cleaning Efficient, were conducted. Exponential and EMC functions were selected in the Buildup and Washoff function, respectively. As a results of sensitivity analysis, Rate Constant has the highest sensitivity and Max.Buildup, Cleaning Efficient and EMC Coefficient in the order. Rate Constant has the highest uncertainty as well. Max.buildup uncertainty index depended on simulation time and simulation time in accordance with time of concentration was more carefully determined in urban area than in forest and agricultural area. This result will be able to take advantage of sewer design in urban area.
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