Hello Reddace,
I know you were asking Rye, but I can help answer that with a little math. A container 18 inches x20 inches x8 inches equals a total of 2880 cubic inches, and 1.6666 cubic feet. There is 7.48 gallons in one cubic foot. 1.6 cubic feet X 7.48= 11.968 gallons. Maximum water volume would be just under 12 gallons. Realistic water volume closer to 8-10 gallons because you wouldn't be filling it up to the rim with water.
Container size
18x 20= 360
360x 8= 2880 cubic inches total
One cubic foot
12x 12= 144
144x 12= 1728
Water volume
2880 (total container cubic inches) divided by 1728 (cubic inches in a cubic foot) = 1.666666
1.6x 7.48= 11.968
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