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4 inches = 1/3 foot so that's 6 and 2/3 cubic feet of water. - 6.6667 cu ft

1 cu ft of water = 7.482 US Gallons and 6.23 imperial Gallons so

6.6667 cu ft = 49.87 US Gallons and 41.53 imperial Gallons

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Q: How many gallons water in 20 square feet at 4 inches deep?
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