1 yard = 3 feet.
Volume = 240 x 1 = 240ft^3
Conversion Factor = 3
240ft^3/3^3 = 8.8yd^3 --> 8.8 Cubic Yards
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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
6 inches = 1/6 yards. So 70 sq yards * 6 inches = 70*1/6 cubic yards = 11.66... cubic yards.
123.44 cubic yards
(522,720) x (2/3 foot) = 348,480 cubic feet= [12,906 and 2/3] cubic yards
You need 82/3 [cubic] yards for every foot deep that it has to be.