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depends on the depth of gravel that you want. Assuming 3 inches deep you need
V = 1380 x 3/ 12 = 345 cubic feet
Water has a weight of 62.4 pounds per cubic foot. Gravel is about 2.7 times as dense as water, so-- 345 x 62.4 x 2.7 /2000 = 29.06 tons
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11y ago

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