Sand mining further erodes the coast, and ground water drainage to sustain human populations triggers land subsidence even as the sea level rises by around 5mm a year.

采砂业也在进一步侵蚀着河岸，而人类的地下水开采导致地面沉降，与此同时，海平面正以每年5毫米的速度上升。

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Subsurface pipe drainage in drought-prone region is superior to surface drainage in draining off water and salt, controlling ground water-level, and increasing crop output, etc.

以明沟排水为对照，论述了内陆干旱重盐碱区暗管排水在排水排盐、控制地下水位、提高土壤脱盐效果及提高作物产量等方面的优越性。

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And municipal water supply and drainage pipe is erected on the ground, if there are problems, will give the city the normal production and life bring serious effect.

且市政给排水工程的管网架设在地下，一旦出现问题，会给城市正常的生产和生活带来严重的影响。

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The drainage will help disperse excess ground water and a specialist flexible waterproof liner mat will be used to re-line and seal the canal.

BBC: Work starts to repair breached Trent and Mersey Canal

Besides the unsightly effects that many mines have on the landscape, they usually churn out vast quantities of toxic waste in the form of acidic drainage-water and tailings the fine particles of rock produced when ore is ground down to release the minerals it contains.

ECONOMIST: Mine pollution