12 inches = 1 foot
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36.83 u.s. gallons of water in 1 ft. of 30" pipe
In a pipe with diameter 8 ft, there will be just over 376 US gallons per foot.
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.
There need not be any water at all in the pipe. The capacity of the pipe is approx 3.4 Imperial gallons.
10.4 gallons.