地下水的机械能包括动能和势能，水力学中用总水头(hydraulic head)H表示,量纲为[L]。
砂柱上部的总水头在排水结束时仍然高于底部定水头边界处的水头。
The total head in the upper portion of the column is higher than the head at the constant head boundary even at the end of drainage.
机翼形量水槽的水头损失不大，水头损失约占上游总水头的14%左右。
The airfoil-shaped measuring flume water head loss isn't higher, and the water head losing has 14% of the total head of water.
机翼形量水槽的水头损失较小，平均水头损失约占上游总水头的12%左右。
The head loss of flume is less, and the average loss is nearly 12% of the total head in upstream.
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