A U.S. liquid gallon is legally defined as 231 cubic inches. A pipe of 3 in diameter has 1.5 x 1.5 x pi x 12 cu ins per foot = 1.5 x 1.5 x 3.14159 x 12 = 84.82 cu ins per foot No of gallons per foot = 84.82/231 = 0.367 galls/ft
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