Influence of Catchment Division Scale on SWMM Model Results

The main urban area of Simao was selected as the research scope. Two sets of SWMM models were constructed with different return periods by taking the different scale of catchment area as a single variable to compare and analyze the operation results. The impact of catchment unit division scale on the simulation results and the change law of related data were explored,which provide reference for determining the spatial scale of modeling.