The piezometric head is also measured from the same datum level.

测压水头亦应从同一基准面算起。

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Meanwhile, in the case of the change of foundation thickness, the law of seepage amount, sand ring diameter, piezometric head, piping breach time etc were respectively explored.

同时，在坝基厚度改变情况下，分别探索了渗流量、砂环直径、测压管水头、管涌破坏时间等的变化规律。

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Meanwhile, in the case of the change of foundation thickness, the law of seepage amount, sand ring diameter, piezometric head, piping breach time etc were respectively explored.

同时，在坝基厚度改变情况下，分别探索了渗流量、砂环直径、测压管水头、管涌破坏时间等的变化规律。

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