Harvesting the rain drop in Brazil - NDTV

Rio de Janeiro: Can 1 mm of rain on the roof help wash away the water problems of a community? If the Rio example is anything to go by, it certainly looks like a promising proposition. Their math says: 1 mm of rain per square metre = 1 litre saved.

Source: http://www.ndtv.com/article/world/harvesting-the-rain-drop-in-brazil-234087

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