内排水系统是指屋面设有雨水斗，室内排水设有雨水管道的雨水排水系统。
隧道内由于排水系统不畅等等原因，导致隧道内路面破损严重。
As the poor drainage system and other reasons in the tunnel, result in a badly damaged of the pavement.
将阀体拧回原位，前端球阀轻轻打开一点，用压缩空气将排水系统内的杂质、水油排空；
The body screw back into place, gently open the little front-end ball valve, using compressed air to the drainage system of impurities, water, oil draining;
一个有效的预排水系统在一个有限的区域内，有一个高水头，巨大的流入，重要的是要防止水浸事故发生的海底隧道。
An effective pre-drainage system in a limited area that has a high water head and huge inflow is important to prevent flooding accidents during subsea tunnelling.
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