Assuming 20 feet by 40 feet, 20x40x4 = 3200 cu ft = 3200/27 = 120 yards = 320,000 pounds
cylinder 18 feet diameter x 1.5 feet deep volume = 381 cubic feet
1 foot by 36 sq feet = 36 cubic feet of dirt is needed
You are mixing volume (square yard) and area (length x width). How deep do you want the dirt? One foot deep you need about 80 square yards of dirt.
There is NO dirt, it is a hole! If you want to fill it with dirt, that is 4x6x12=288 cubic feet, weighing about 28,800 pounds
6,400 ft3
36 cubic feet of dirt=)
cylinder 18 feet diameter x 1.5 feet deep volume = 381 cubic feet
1 foot by 36 sq feet = 36 cubic feet of dirt is needed
If the raised garden has dimensions of 5 x 5 x 1 then it requires 25 cubic feet of dirt to fill it.
8.333 cubic feet
if you mean a 30 foot diameter circle, then pi x 152 x 3 = 2119.5 cubic feet of dirt
You are mixing volume (square yard) and area (length x width). How deep do you want the dirt? One foot deep you need about 80 square yards of dirt.
about 5 min. if it's only 1" deep, depending on water pressure.
There is NO dirt, it is a hole! If you want to fill it with dirt, that is 4x6x12=288 cubic feet, weighing about 28,800 pounds
39,600 cubic feet. 1,466 cubic yards or about 122 truckloads if it were non-compacted fill.
6,400 ft3
To fill a hole 2 feet long, 4 feet wide, and 6 feet deep would take 48 (2 x 4 x 6) cubic feet of dirt.