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.
在建筑物附近的人行道和景观区域内不允许有路面排水系统。
Surface drainage across the sidewalks and landscaped areas adjacent to the building is not acceptable.
在建筑物附近的人行道和景观区域内不允许有路面排水系统。
Surface drainage across the sidewalks and landscaped areas adjacent to the building is not acceptable.
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