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1 gallon = 0.1336 cu ft

therefore cylinder can hold = 25000 * 0.1336 = 3340 cu ft water

volume of the cylinder = pi * r^2 *h

hence , 3340 = 22/7 * (8)^2 * h

solving we get h = 3340*7/(22*64) = 16.6 feet Answer

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