但是，要这样走，就必须彻底清楚这个巨大珊瑚形阴渠的所有分岔和直管。

But in order to do this, he must have been thoroughly familiar with the enormous madrepore of the sewer in all its ramifications and in all its openings.

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污水处理厂的进水水质还与污染物在管渠中的降解有关，因此本课题也研究分析了污水在管道与明渠中的降解情况，确定了相应的降解常数。

The wastewater quality is also related to the pollutant's degradation. Through analyzing the degradation in the trench and in the drainpipe, we get the degradation constant.

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对排水(管)渠等非金属材质管线，应采用地质雷达探测的方法。

Nonmetal pipelines, including drainpipe and offtake, should be detected by geological radar.

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