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Rainwater Harvesting Calculator
Calculate potential rainwater collection and storage requirements for your property
Roof Collection Area
(sq ft)
Annual Rainfall
(inches)
Roof Material
Metal (95% efficiency)
Asphalt shingles (85%)
Clay tile (80%)
Concrete (75%)
Storage Goal
1 week supply (5%)
2 week supply (10%)
1 month supply (15%)
2 month supply (25%)
Calculate