In the partly separate system,two sewers are also provided,but this time fulfilling slightly different functions.One sewer receives domestic sewage,trade effluent and rainwater from roofs only and the other all remaining rainwater.

• 半分流式也有两条管道,但功能有所不同。一条排放生活污水、工业废水和屋顶的雨水,另一条排放除此之外的其它雨水。