She pulled out the plug and let the water drain away.

她拔起塞子放掉了水。

《牛津词典》

The total volume of water in the saturated sample must therefore be thought of as consisting of water that can, and water that cannot drain away.

"因此，人们认为充满水分的岩石样本的总含水量既包括可能会渐渐流失的水分，也包括不会流失的水分。

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The water will soon drain away [off].

水很快就会流掉。

《新英汉大辞典》

Network Rail said workers were laying a pipe underneath the track to allow the water to drain away onto the other side.

BBC: Bridgend flooding: Brackla flats evacuated

Meanwhile, some people living in Kilham claim the flooding last month was made worse because the council did not clear the gullies to allow the flood water to drain away.

BBC: Burton Fleming covered in snow

He said there was concern for more low lying areas as the water begins to drain away.

BBC: Somerset floods: Warnings remain after heavy rain