Roof runoff water quality was affected by rainfall, rainfall intensity, roof material, season and air temperature.

屋面径流水质主要受降雨量、降雨强度、屋面材料、季节和气温的影响。

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The rain runoff water quality in Shanghai was monitored and the main pollution factors influencing the water environment were investigated.

通过对上海市雨水径流水质的监测，以及对其污染主要影响因素与污染程度的分析，掌握水质特性及其变化规律。

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The concentrations of nitrogen and phosphorus in runoff water is higher than that in infiltrated water. Surface runoff is the main way of nitrogen and phosphorus losses under the condition.

径流液中各形态氮、磷浓度远高于渗漏液，而两种流失方式下排水量差异不显著，故地表径流是该条件下氮素和磷素流失的主要方式。

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Collecting it also reduces runoff of storm water to the nearby Potomac River.

VOA: special.2011.07.08

The pools store runoff water from the rickety, cumbersome system Tepco threw together after the accident, to cool Fukushima Daiichi's reactors.

WSJ: Leaks Rouse Fears at Japanese Nuclear Plant

Algae also offer the potential of aiding in the curbing of CO2 emissions from power stations and cement factories, and in cleaning nitrates and phosphates from agricultural runoff water and effluent from sewage plants, while simultaneously furnishing useful fuels such as biodiesel and ethanol according to how the algae are processed.

FORBES: 'Artificial Cells' May Provide Souce Of Algal Fuel

Unfortunately, these systems frequently overflow, and so untreated sewage and storm water runoff are expelled into surrounding water bodies.

FORBES: Spending Cuts Threaten U.S. Water Infrastructure