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First figure out how many cubic inches are in your pipe.

pi (5 in ) ^2 x (80 ft x 12 in / ft ) = 78.54 in^2 x 960 in= 75398.4 in^3

there are .4 us gallons in 100 cubic inches

(75398.4 in^3 / 100 in^3 ) x 0.4 gal = 301.59 gallons

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14y ago

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