Waves of sand firmed by an overnight rain flow along the route of a fisherman pedaling his catch at dawn to trade it for supplies.

尽管通宵的雨水把沙浪浸得比较结实，可是还在沿着渔民蹭自行车所经过的道路流动着。黎明时分，他急匆匆地要把所捕捉到东西赶往市场。

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"A concave roof like this will help make even the smallest quantities of rain flow off the roof and eventually coalesce into bigger drops just right for harvesting before they evaporate, " they added.

他们接着说：“像这将的凹形屋顶即使是在雨量非常小的情况下也能够在雨水蒸发之前使雨水从屋顶流下来，最终凝聚成较大的水流收集起来”。

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They take in rain and allow it to flow into the soil instead of running off.

它们吸收雨水，让雨水流进土壤，而不是流走。

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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

Somewhere in the world, rain is falling on a mountain valley or forest, from where it will flow to people in cities like Tanga, Tanzania or Denver, Colorado.

FORBES: The $8 Billion Bargain: How Watershed Payments Save Cities, Support Farms And Combat Climate Change