The representation of combined sewer areas in the SWMM RUNOFF model is an important issue as it influences the prediction of peak flows and overflow volumes in subsequent combined sewer overflow (CSO) system modeling. Careful consideration should be given to the proper selection of rainfall input, computational time step and RUNOFF elements used to simulate the combined sewer area response. Whenever possible, monitored flow data should be used to calibrate the timing and distribution of the RUNOFF generated hydrograph. If monitored flow data is limited or unavailable, a synthetic hydrograph method may be used to support representation of the hydrograph shape. This paper details the work performed to improve the Greater Detroit Regional Sewer System Model (GDRSS) RUNOFF model for simulation of the complex combined sewer area response from its watershed.
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