A gallon is a measure of volume which needs three dimensions to describe. You have given only two in the question so the question cannot be answered.
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1,269,551.02 US gallons.
A 12 inch diameter round pipe will hold 4.89 UK gallons or 5.88 US gallons per foot.
Over 9,000.
This pipe can hold up to 0.5 cubic foot or 3.7 gallons of water.
146.9 gallons of water.