Helpful Rainwater Collection Formula
From Wikipedia: Calculating rainwater collection
Rainwater collection from roofs can be calculated using the following formulas:
- 1 inch of rain on a 1000 square feet roof yields 623 gallons of water; or
- 1 cubic foot equals (12 inch by 12 inch by 12 inch cube) equals 7.48 gallons; or
- 1 millimeter of rain on a 1 square meter surface yields 1 litre of water.
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