In the meantime the time variation of the water level in the ditch has been taken into account, therefore the groundwater head are time-varying as the groundwater flows toward the drain system.

在讨论这个问题时，又考虑进了排水沟中的水位也是随时间而变化的，因此在地下水流动过程中的任一瞬时，其地下水头差也是一个变量。

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At last, taking the dialing Xincun slope harnessing engineering as the example, the slope stability under the affection of rainfall and the application of drain ditch and drain hole are accounted for.

最后，文章以茶岭新村边坡支护工程为例，说明了降雨对边坡稳定的影响以及排水沟和泄水孔等在边坡支护中的运用。

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With decompress well and drainage ditch to drain and decompress can effectively reduce groundwater level and prevent immersion outside reservoir.

减压井和排渗沟联合排渗减压是降低地下水位、防止库外浸没的有效措施。

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Under the Ninth Circuit ruling, a permit could be demanded for every drain and ditch that directs water from a logging road to a fish-bearing stream.

FORBES: A Supremely Important Decision About America's Logging Industry