Calculadora de Cisterna de Água da Chuva
Estime a quantidade de água da chuva que você pode captar e o tamanho ideal da cisterna.
Gallons Collected
748 gal
Gallons Collected vs Roof Catchment Area
Formula
How Rain Collection Is Calculated
One inch of rain on 1 square foot of roof produces about 0.623 gallons of water.
Formula
Gallons = Roof Area (sq ft) x Rainfall (in) x 0.623 x Efficiency
Efficiency accounts for losses from gutters, splashing, and first-flush diverters.
Exemplo Resolvido
1,500 sq ft roof, 1 inch of rain, 80% collection efficiency.
- 01Raw collection = 1,500 x 1 x 0.623 = 934.5 gallons
- 02With 80% efficiency = 934.5 x 0.80 = 747.6 gallons
- 03Standard barrels = ceil(748 / 55) = 14 barrels
Perguntas Frequentes
Is rainwater collection legal?
Laws vary by state/country. Most US states allow rainwater collection, some with permits. Check local regulations before installing a system.
What can I use collected rainwater for?
Primarily garden watering, lawn irrigation, and car washing. With proper filtration and treatment, it can be used for non-potable household use.
How much rain does an inch represent?
One inch of rain on a 1,000 sq ft roof yields about 623 gallons. A typical rainstorm of 0.5 inches on a 1,500 sq ft roof gives about 467 gallons.
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