The old Pi x radius squared will give us the area. Then multiply by the height (3.5 feet). Here goes...3.1417 (Pi) x 36 (radius in feet squared) x 3.5 (height in feet) totals 396 cubic feet. Converted to U.S. gallons would be.....2,962 gallons.
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V = pi * (r^2) * h V = pi * (6^2) * h 42 in = 3.5 feet = h V = pi * (6^2) * 3.5 V = pi * 126V = 395.840674 ft3 1 foot3 = 7.48051948 US gallonsTheAnswer = 395.840674 * 7.48051948 TheAnswer = 2 961.09387
An 8-foot round pool filled to a depth of 13 inches would contain about 410 gallons of water.