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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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Q: How much water does a 3 inch pipe carry per foot?
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