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Answer: the barrel will hold 9.42 ft³ of water.
27,150 gallons.
If you place a flat pan with straight up and down sides outdoors and it rains, you can measure with a ruler the depth of the rainwater in the pan . If you measure 3.5 inches of water, then you have had 3.5 inches of rain.
259200 cubic inches or precisely 150 cubic feet
(1 in) * 1 (mile^2) = 17,378,742.9 US gallons 17378742.9 US gallons PURE WATER ≈ 145,032,638.36815932 pounds ≈ 65,785.6982 tonnes Rain water is probably heavier than pure H2O .. but I really have no idea.