Based on the non-linear kinematic wave method, a technique using the four point, excentric, implicit, finite-difference numerical scheme to simulate the urban stormsewersystem 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 sewersystem is ancient and poorly designed, combining storm water runoff with sewage in the same piping system.