六百多万人仍然没有与任何排污管道相连接(主要原因是他们住在非法的房屋聚点)，他们的污水流进了排水明沟。
More than 6 million people remain unconnected to any sewer line (mainly because they live in unauthorized housing settlements), and their wastewater flows into open drains.
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。
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.
经过调研和反复现场勘察，确定的总体施工方案为：挖明沟排水，作业带晾晒，正常组对焊接，沉管下沟。
Therefore the general construction process scheme is worked out as follows: open trench drainage, work site dried in the sun, conventional butt welding, and pipe laid down into trench.
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