Research on LID Facility System Based on SWMM Digital Model

SWMM method was used to analyze the effects of different LID measures such as vegetation retention, permeable asphalt pavement and permeable pavement on urban road runoff and pollutant discharge. The linear standardization method combined with the optimal objective function is used to optimize the proportion of each type of building. Taking typical precipitation as an example, the hydrological, hydraulic and water quality parameters in the model are calibrated. When the frequency of precipitation reaches 80%, the proportion of permeable paving, concave greening and vegetation retention grid is 46%-49%-46%, respectively, and its control effect on surface runoff reaches 83%. The combination of SWMM and optimal objective function can obtain the optimal economic benefits of the proportion of various Lues in the urbanization area.