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Lets figure out cubic feet first, then convert to gallons.

Volume = pir2h

pi = 3.1416

r = 1/2 X diameter = 1/2 X 20" / 12"/' = 0.83'

h = 20'

volume = 3.1416 X 0.83'2 X 20' = 43.6 cubic feet

43.6 cubic feet X 7.5 gallons/cubic foot = 327 gallons

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