Urban river bank initial rainwater collection capacity determination method and rainwater collection device

The invention discloses an urban river bank initial rainwater collection capacity determination method and a rainwater collection device, and belongs to the technical field of rainwater purification. The method comprises the following steps: 1, determining the total number N of rainwater outlets along the bank of the urban river and the position of each outlet; 2, acquiring a surface runoff curve Qi (t) at each rainwater outlet and a pollutant content curve Ci (t) at each rainwater outlet; 3, calculating the total pollutant load W (t) of the incoming water of a single-field rainwater collection pool; 4, calculating a collection stopping time point c of the rainwater collection pool according to the sponge city runoff pollutant reduction rate index; and 5, constructing a rainwater collection pool volume model, and calculating the total volume V of the rainwater collection pool. According to the method, the volume of the rainwater collection pool is determined by scientifically utilizing the pollutant load accu