Abstract:Aiming at the design of regulation and storage facilities for pollution control in the separate system, this paper attempts to introduce the mass flush curve reflecting the functional relationship between runoff and pollution load, and use the data calculated by SWMM(storm water management model)model to determine the regulation and storage scale. At the same time, the multi-attribute decision-making model is used to optimize the design of the regulation and storage facilities, so as to establish a more scientific and concise optimization design method to control regulation and storage facilities of runoff pollution in the separate system. Taking a county in Shanxi Province as an example, the results show that compared with the traditional terminal regulation and storage scheme, the total regulation and storage scale of the optimized scheme is increased by 6. 3%, the average node regulation and storage scale is reduced by 47%, the runoff pollution control effect is improved by 5%, and the system overflow in the high return period can be reduced. The optimized scheme can achieve the goal of runoff pollution control and reduce the risk of waterlogging at the same time, which shows the effectiveness and feasibility of the optimized scheme.