It is very helpful to improve the river water quality.

十分有助于河流水质的改进。

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The river water quality should further improve once more village houses are connected to the public sewer.

更多村屋接驳至公共污水渠，城门河水质可望进一步改善。

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The grey simulation method for river water quality system is studied and an example of application is given.

本文研究了河流水质系统的灰色模拟方法，并给出了应用这种方法的计算示例。

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Its Ohio River basin water-quality trading project will allow those facing high pollution-control costs to buy reduction credits from those whose costs are lower.

ECONOMIST: Nutrient pollution

The realisation that the effects of land-use changes in the Thames catchment take more than 30 years to show themselves fully has profound implications for policies to monitor and manage the river's water quality.

BBC: Thames archive reveals long nitrate rise

But they said water from the river was safe, with water quality meeting government-set standards.

BBC: China pulls nearly 6,000 dead pigs from Shanghai river