In this case, the water table is not flow surface and there is no "seepage surface" on the side walls of drainage river channel.

该条件下的潜水位面不是流面，在排水河渠边壁也不存在所谓的“渗出面”。

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Once all this information has been gathered, it becomes possible to judge whether a lake's flow is mainly due to its surface inputs and outputs or to its underground inputs and outputs.

一旦收集了所有这些信息，就有可能可以判断一个湖泊的流量主要是由其表面还是地下的输入和输出导致。

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If the glass were kept hot enough, it would flow over the molten tin until the top surface was also flat, horizontal and perfectly parallel to the bottom surface.

如果玻璃保持足够的温度，它就会在熔化的锡中流动，直到顶部表面也变得平整、水平，与底部表面完全平行。

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On reaching the shale, the mixture of water and fracking fluid bursts open the rock and the sand keeps the fractures open, allowing the gas to flow to the surface.

ECONOMIST: Fracking

As warm surface waters flow north they cool and get saltier, which makes them denser.

ECONOMIST: The science

Most of that water stays in the well, but 20% returns to the surface as flow-back in the days and weeks after fracking.

ECONOMIST: Shale gas��s poor image in Europe is largely unjustified