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。
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.
泥沙淤积在排水沟引起地下水位上升，并危害作物。
Sediment deposits in ditches result in the raising of water tables and damage to crops.
本文主要讨论控制地下水位的田间排水沟的间距计算方法。
In this paper, a simplified iterative arithmetic to calculate spacing of field drain is developed.
本文主要讨论控制地下水位的田间排水沟的间距计算方法。
In this paper, a simplified iterative arithmetic to calculate spacing of field drain is developed.
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