Due to the limitation of subjective and objective factors,such as the importance of reconstruction,time sequence,economic condition and reconstruction difficulties,etc,the combined sewer system in many old urban districts has been preserved till now. In this study,SWMM model was used to simulate and evaluate pollutants reduction in urban combined sewer area,which aimed to provide reference for interception ratio and construction direction of combined sewer system. When the interception ratio was no less than 2,the combined sewer system could achieve the pollutants interception performance equa...
