Rainwater Harvest Calculator

Rainwater harvesting is the gathering of rainwater for reuse on-site, rather than allowing it to run off. It is one of the simplest and oldest methods of self-supply of water for households. Just enter the roof area, and the amount of rainfall in the rainwater harvest calculator to calculate rainfall harvesting in litres.


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Rainwater harvesting is the gathering, or accumulating and storing, of rainwater for small irrigation and a way to increase ground water levels. Use our online rainwater harvest calculator to find the amount of rainfall harvesting in liters.