Volume of a cylinder = (pi) (radius)2 (length)
Radius = 1/2 diameter = 12 inches
Length = 12 inches
Volume = (pi) (12)2 (12) = 1,728 pi = 5,428.67 cubic inches = 23.501 gallons.
That's the volume of the piece of pipe. We have no way of knowing
how much water may be in it. It could even be empty.
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0.212 331 gallons per foot.
36.83 u.s. gallons of water in 1 ft. of 30" pipe
There need not be any water at all in the pipe. The capacity of the pipe is approx 3.4 Imperial gallons.
0.6528 gallon per foot (rounded)
A square foot equals an area 12"Wide x 12"Long x 1"Deep. A cubic foot equals an area 12"W x 12"L x 12"D. Therefore, a cubic foot contains 12 square feet. A cubic foot contains 7.48 gallons of water (trust me). You divide a cubic foot by 12 to get 12 square feet, therefore you would divide 7.48 by 12 to get the amount of water contained in 1 square foot. 7.48 divided by 12 equals .623 gallons. For every inch of rainfall there will be .623 gallons of water falling on every square foot.