The final drained water did not lie in the state of eutrophication(E<1).

养殖后排放水不处于富营养化状态（E<1）。

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Some roof gutter exchange downspouts for baffle type designs break up the stream of drained water, so that it does not erode the ground below.

一些屋顶排水沟的挡板式设计打破了排水水流交换落水管，所以它不会削弱地下。

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The result indicates that the quality of treated water can meet the water quality standard and drained water standard by using the new FSAN without changing the sewage treating process.

结果表明，新的水处理药剂FSAN在不改变原采油污水处理工艺的情况下，可使处理后的水质既可达到注入水水质标准，又可达到外输水质标准。

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Sections of the canal need to be drained of water in order to complete the work.

BBC: Fish removed from Bath canal for lock repairs

The Spanish soon drained the water away, and started building.

BBC: NEWS | Programmes | From Our Own Correspondent | Mexico's sinking city

More than 4ft (1.2m) of water had drained out of the lake at Tunstall Park on Wednesday night, the Coal Authority said.

BBC: Stoke-on-Trent mine collapse drains lake