Construction and Application Analysis of SWMM Model in Beijing Future Science Park

Aiming at more frequent urban waterlogging problems in China, a system of rainwater drainage pipe network by SWMM (Storm Water Management Model) was constructed, using Beijing Future Science Park as the study area. The empirical runoff coefficient method is used for model parameter calibration and validation of “6.23” and “7.21” rainfall runoff processes to build the regional SWMM model and simulate regional rainfall runoff processes in different return periods. Comprehensive runoff coefficient and flood peak flow are used as indicators to analyze the above simulation results. In terms of the whole area, both elements increase with longer design return period, the same as regional flood risk. In terms of the local area, comprehensive runoff coefficient of sub-catchment area increases with a longer design return period, but different with various underlying surface conditions. Among them, the comprehensive runoff coefficient of green land with better permeability is only 0, while the corresponding value of road area with permeability of 90% is 0.89, to indicate the differences in spatial distribution of regional flood risk along with the underlying surface conditions. The above research results provide the technical support for the construction of regional low impact development measures (Low Impact Development, LID) and urban flood warning.