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To calculate the capacity of a pipe you need to first calculate the area and volume. So assuming your pipe has an inside dimension (ID) of 3 inches, you would use the following equation.
πR2 = area
πR2xH = volume
π=3.1416
Using inches as our unit
R (radius) = half the diameter = 1.5 inches
H (height or length of pipe) = one foot of pipe = 12 inches
Gives you the volume in cubic inches
1728 cubic inches per cubic foot (12x12x12)
One cubic foot = 7.48 US gallons
(RxR)x3.1416x12
(1.5x1.5)x3.1416x12 = 84.82 cubic inches
84.82/1728=.049 cubic feet
.049 cubic feet x 7.48 US gallons per cubic foot = 0.36652 US gallons per foot of 3" ID pipe.
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