Method for calculating overflow amount of rain sewage system

The invention discloses a method for calculating overflow quantity of a rain sewage system. The method comprises the following steps: S1, acquiring water inlet monitoring data and rainfall data of the rain sewage system; s2, first water inlet monitoring data obtained in N dry days are obtained, and the theoretical sewage amount is obtained through calculation; s3, the first rainwater mixing amount is calculated according to second water inlet monitoring data obtained in rainy days and the theoretical sewage amount; s4, based on the first rainwater mixing amount and the first rainfall data, fitting to obtain a rainwater mixing amount prediction model taking the rainfall data as an independent variable; step S5, calculating a second rainwater mixing amount based on the second rainfall data and the rainwater mixing amount prediction model; and S6, calculating the overflow amount of the rain and sewage system according to the second rainwater mixing amount and the theoretical sewage amount. According to the metho