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Where does the .623 number come from when calculating how much rain I can capture?

April 26, 2017calculating capture rain

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Where does the .623 number come from when calculating how much rain I can capture?

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The formula for figuring out how much rain water you can collect off your roof is roof square footage x .623 gallons per square inch of rainfall x annual rainfall. Square footage of the roof of the house x amount of rain and the last variable is .623. A cubic foot of water being equal to 7.48 gallons, which when divided by 12 (i.e. inches in a foot) equals .623 gallons per inch of rain.