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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2 mi2 x 2 in = 9.293x106 ft3 = 6.951x107 gallons
40 square feet * 2 inches = 40*(1/6) = 6.66... cubic ft = 41.5 UK gallons or 49.9 US gallons (approx).
17,204 gallons.
About 15,293 gallons.
About 7,600 gallons