Analysis of the Effect of Low Impact Development on Urban Runoff Control Based on the SWMM Model

In order to solve the problems of frequent urban flood disasters and the continuous deterioration of the water environment in the process of urbanization, the urban storm flood management method centered on Low Impact Development (LID) has become a new concept in urban construction. Taking one residential area in Beijing as the research object, and on the basis of the Storm Water Management Model (SWMM), this paper simulates and analyzes the effect of LID measures on runoff control under different rainfall conditions, and deduces the functional relationship between the LID scale and runoff reduction. The results show that the runoff reduction rate decreases with the increase in rainfall level, and LID measures have the most obvious effect on runoff quantity reduction while having a small effect on the peak time delay. The research methods and results of this paper can provide a reference for sponge city construction, flood control and drainage management.