地下水渗出（相当于一点污染源）进入河流后，在随河水向下游运移的过程中，其水质浓度也将发生衰减。

The solute concentration decays when the groundwater discharge, a spot of pollution source, enters to streams and moves to lower reaches.

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注意“净值”这一词：测量地下水渗入并且渗出湖水的实际水量比仅仅推断出它们的差异要复杂得多。

Note the word "net" measuring the actual amounts of groundwater seepage into the lake and out of the lake is a much more complicated matter than merely inferring their difference.

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水通常是自然形成的地下水，沿着岩石的裂缝渗出；不那么典型的是，水是通过从地表抽水而人工引入的。

The water is usually naturally occurring groundwater that seeps down along fractures in the rock; less typically, the water is artificially introduced by being pumped down from the surface.

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