Why is equation 1 divided by 12" ?
Vr=(P.Rv.A)/12"
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NC-2009 SSc6.1: Stormwater Design—Quantity Control
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Equation 1. Volume of Captured Runoff
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Michael DeVuono
Regional Stormwater LeaderArcadis North America
LEEDuser Expert
186 thumbs up
January 15, 2014 - 8:35 am
Unit conversion.
P is in inches and you're solving for cubic feet.
To be clear, you are not dividing by 12" either.
If P = 2 inches 2/12 is the same number in feet.