井必须足够深才能达到好的地下出水层，因为大量的地下水储存在那里。
The hole must be deep enough to reach a good aquifer where groundwater is stored in large amounts.
该方法不是用井水位的恢复曲线，而是用井水位的振荡曲线计算出水井含水层的导水系数。
This method can be used to calculate the transmissibility coefficient of well aquifer by means of the oscillation curve of well water level instead of the recovery curve.
徐州矿区开采深度大，水文地质条件复杂，水害严重。主要突出水源为奥陶系含水层。
In Xuzhou Coal mining Area the groundwater hazard is serious due to the larger mining depth and complicated hydrogeological conditions.
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