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Assuming that the 6-in is the diameter of the column that is 400-ft long. The volume of a cylinder equals the (area of the base)*height = h[pi]r^2 Area of the base equals area of a circle equals [pi]r^2 r is the radius and equals 1/2 the diameter--.5 ft/2 or .25-ft [pi].25^2 equals .19635 *400-ft equals 78.53982ft� There are 7.48051948 US Gallons per cubic foot 78.53982ft� x 7.48051948 = 587.519 gallons (US Liquid)

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14y ago
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Q: How many gallons of water does a six inch column that is 400 feet deep in the ground hold?
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