First convert all units to the same units - everything to inches, or everything to feet. Then use the formula for a cylinder to calculate the volume, which will be in cubic inches, or cubic feet. Finally you'll have to convert that to gallons.
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0.212 331 gallons per foot.
36.83 u.s. gallons of water in 1 ft. of 30" pipe
About 1,246 Imperial gallons (UK) or about 1,500 US gallons.
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.
There need not be any water at all in the pipe. The capacity of the pipe is approx 3.4 Imperial gallons.