This kind of drainage system is the

This kind of drainage system is the most common way, also in The implementation in Hangzhou has begun to bear fruit, it uses the status quo pipe, saves a lot of investment, eliminates the impact of laying sewage pipeon on the city's roads on traffic, solves the pollution problem of the initial rainwater, and is easy to implement, for a certain period of time is a kind of economical, fast and effective form of sewage collection