Water Resources and Power

In recent years, urban waterlogging disasters have occurred frequently. How to accurately evaluate the drainage capacity of the pipe network and respond quickly is particularly important. Based on the characteristics of different regional conditions, this study constructs a rainstorm waterlogging model based on the SWMM model, simulates and analyzes the urban waterlogging under different working conditions, and evaluates the drainage capacity of the pipe network system. By building a physical experiment platform, the waterlogging results under different working conditions are analyzed and verified. The results show that when the rainstorm return period in the study area is greater than the 20-year return period, the change of the location of the outlet along the river has no significant effect on the drainage capacity of the pipe network; When is greater than the 50-year return period, the influence of the change of upstream storage water volume on waterlogging is weakened. When the position of the outlet in the area changes from semi-submerged to fully exposed to the water surface, the degree of waterlogging change is the most obvious when the rainstorm occurs more than once in two years. When the storage volume is full for occurrence of rainstorm, the larger storage water body may cause stronger disturbance to the liquid change of the upstream pipe network. The research puts forward guiding suggestions for urban flood control and drainage during rainstorm.