分流制雨水系统旱流放江严重污染了上海市河道水质。
The discharges from separate storm sewer systems in the dry weather do great harm to receiving water in Shanghai.
分流制雨水系统的非雨水入流不但影响其正常的排涝功能，而且混接污水的直接排放还易导致受纳水体的严重污染。
The drainage function of split-flow rainwater system is affected by non-rainwater inflow, and directly discharging the mixed wastewater can cause serious pollution of receiving bodies.
合流制改造在综合考虑城市现状的同时，必须要有超前性，要尽可能去实现污、雨水的分流排放。
Reform on concourse pipelines must consider comprehensively the contemporary situation of a city and make out advanced layout designs to divide sewage and rainwater into different pipelines.
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