When the ground become so saturated that water can no longer seep into the soil, it begins to run off quickly into rivers and streams and this causes a rise in water and a flash.

地面被浸透以后，水流就无法渗入土壤中，而是开始迅速流入河流和小溪，这会造成水位上升继而引发暴洪。

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If meteoric water does not evaporate or run overland, it may seep directly into the ground.

如果雨水不从陆地蒸发和流走的话，就可能直接渗入地下。

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Office suites will host startup companies, including one devising a system for cultivating algae as biofuel, another producing a type of pavement that lets rainwater seep into the ground instead of flooding sewers.

WSJ: Great Lakes region pins economic hopes on water