Method for determining W parameter of surface runoff pollutant in SWMM software

The invention discloses a method for determining W parameter of surface runoff pollutant in SWMM software. The method consists of two parts. One is to simulate the erosion of surface sediment with pure water by artificial rainfall under laboratory conditions to form pollutant concentration of surface runoff W0. The other is to consider the natural rainfall water concentration W1 affected by air pollution. By combining the two parts, the determination method of pollutant parameter W of surface runoff under natural rainfall condition is realized. The method solves the problem of determining water quality parameters in SWMM software through the actual runoff data, and combines air pollutants and surface sediment pollutants into urban surface runoff pollution sources to establish a new model of water quality erosion model. Through the method, new SWMM water quality model parameters can be set up in different regions to prevent the errors to the model caused by regional problems. 种确定SWMM软件中地表径流污染物参数W的方法，该方法有两部分组成，