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Water Portal / Rainwater Harvesting / Rooftop rainwater harvesting

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→‎Suitable conditions

Rainwater harvesting requires at least an annual rainfall of 100-200 mm. Many places in Latin America have rainfalls of about 500 millimeters per year.

It is suitable even when the roof is small. For example a 5 x 6 meters (that is to say 30 square meters) house, with 500 mm annual precipitation, receives a rainfall of 15.000 liters on its roof; this is a sufficient amount for a family formed by 5 members. Storage tanks can additionally be filled up by pumps.

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