Abstract:Through the design example of zhongshandonghe road rainwater pumping station, this paper interprets the design of the pumping station under the outdoor drainage design standard of the tunnel: Demonstrate the rationality of setting up the second transverse ditch,on the one hand, the water is collected by the method of "High Water and high drainage", on the other hand，the water is collected by the combination of the horizontal slope and the vertical slope, it can effectively reduce the water-collecting pressure at the lowest point of the Flood Peak Tunnel, studies and discusses the determination of the design catchment area and the selection of the recurrence period, and puts forward a new formula for calculating the ground water-collecting time, the 20% safe space should be reserved in the scale of the cross-grade separation rainwater pumping station, which can effectively reduce the number of pumps to start, and reduce the operating cost. Finally, according to the requirement of waterlogging check, the capacity of drainage system under continuous 3-hour rainfall in 10-year, 20-year and 30-year return periods was simulated and analyzed by establishing SWMM model, there is no water accumulation in the tunnel, one pump can be opened to deal with the storm once a year, and the two pumps can be operated in parallel to deal with rainfall with a return period of 5 to 10 years, three pumps open at the same time can meet the waterlogging check once in 30 years of heavy rainfall. The simulation design under different working conditions reduces the number and times of pump opening under the same rainstorm intensity, and reduces the cost of operation and maintenance. It can be used for reference in other engineering design.
