one acre = 4840 sq yd and 3 feet = 1 yard
4840 x 1 = 4840 cu yds
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Multiply (acre-feet) by (1,613 and 1/3) to get (cubic yards). 3 acre-feet = 4,840 cubic yards. Multiply (cubic yards) by (0.00062) to get (acre-feet). 24,200 cubic yards = 15 acre-feet
24 cubic feet = 0.89 cubic yards
The answer depends on how deep the coverage will be. River Rock weighs 2,800 LBS. per cubic yard - That's 1.4 tons per cubic yard. One ton = 2,000 LBS. 2,000 divided by 2,800 equals roughly 0.71. So one ton of river rock is roughly 0.71 cubic yards. 0.71 cubic yards covers roughly 230 square feet 1" deep 0.71 cubic yards covers roughly 115 square feet 2" deep 0.71 cubic yards covers roughly 77 square feet 3" deep 0.71 cubic yards covers roughly 57 square feet 4" deep 0.71 cubic yards covers roughly 38 square feet 5" deep
It takes 5.0926 cubic yards or 137.5 cubic feet.
5.6 acres*3.5ft = 27104 sq yards*1.166... yards = 31621.33... cubic yards.