An area with these dimensions has a volume of 3.03 cubic yards.
1,000,000 cubic yards.
Three acres three inches deep is 403.33 cubic yards.
3,495.6 cubic yards.
1.851852 cubic yards
13.1 cubic yards, approx.
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.
162 cubic feet.
You will need 0.56 cubic yards of concrete.
You would need approximately 2.5 cubic yards of gravel to cover a 12' by 15' area at a depth of 2 inches.
40.1 cubic yards
3,456 cubic yd.