91.5 Imperial gallons, approx.
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2000 Gallons
7.5
A 12 inch diameter round pipe will hold 4.89 UK gallons or 5.88 US gallons per foot.
A lot. ;)
18 * 20 * 12 = 4320 which is the volume in cubic inches and is 18.7012987 gallons. Divide 4320 cu. in. by 231 cu. in. per gallon.