Roof rain runoff areas may require a drain or gravel sump to protect plants and structures.

屋顶雨水径流的地区可能需要排水渠或砾石坑保护植物和结构。

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Rainfall in the valley through the rain runoff mechanism collects to a basin export, and forms a watershed runoff.

降落在流域上的雨水经过产流机制的作用汇集到流域出口形成流域径流。

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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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When rain and melting snows flow over a city's streets, parking lots and sidewalks, that runoff picks up all kinds of pollutants residues of petroleum and pesticides, soaps and solvents, as well as pet and wildlife waste.

VOA: standard.2010.08.04

This river and rain runoff, combined with strong onshore winds, has led to high levels of sea pollution.

BBC: Where to go while Biarritz battles beach pollution

From every rain simulations the runoff coefficient was estimated with a average of 0, 19 (min 0, 01 and max 0, 46).

UNESCO: AQUATACAMA

This document presents the design and evaluation of a rain simulator to study soil losses and runoff generation in erosion plots located in hilly bared soil.

UNESCO: AQUATACAMA