Based on the non-linear kinematic wave method, a technique using the four point, excentric, implicit, finite-difference numerical scheme to simulate the urban storm sewer system is introduced.

本文根据非线性运动波法理论，介绍了四点非中心隐式有限差分格式模拟城市雨水管网的技术。

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The sewer system is ancient and poorly designed, combining storm water runoff with sewage in the same piping system.

下水道系统是古代和设计不当，结合雨水径流污水在同一管道系统。

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We have a proposed stormwater control plan that will use a host of green infrastructure like rain gardens, green roof technology and green space to keep harmful storm surge out of out sewer system.

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