Diameter = 1 inch so radius = 0.5 inches.
Volume of cylinder = pi*r2*h = pi*(0.5)2*12 = 9.4 cubic inches, approx.
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It holds 702 cubic feet.
2.75 Imperial gallons.
1 Gallon
A square foot is not going to hold any water, because it's flat. You need a cubic measurements for volume.
At 7.48 gallons per cubic foot that is 3.14x30x30/4x52 x7.48 /12 = 22,900 gallons