On the Control Strategies of Initial Period Rainwater Pollution in Tianjin City

The control of initial period rainwater plays an important role in urban water quality management since the initial period rainwater carries a greater portion of pollution loads. Appropriate strategies are needed for effectively controlling the non-point source loads (NPSL). In the present approach, the Storm Water Management Model (SWMM) is applied to simulate and control the NPSL of the service area of Chilong river pumping station in Tianjin city. At different rainfall intensity, the relationship between the interceptive amounts of initial runoff and their corresponding reduced portion of NPSL are obtained and the effectively controlling strategies are proposed.