7,500
cylinder 18 feet diameter x 1.5 feet deep volume = 381 cubic feet
none there is no dirt in a hole
261.66
Assuming that you're referring to a cylindrical pool that has a 30 foot diameter and is evenly 10 feet deep throughout, it should hold approximately 940 gallons of water.
7,500
There is no dirt in a hole that is 3 feet deep and six inches in diameter.
cylinder 18 feet diameter x 1.5 feet deep volume = 381 cubic feet
27
none.
40 to 50 feet
none there is no dirt in a hole
18.6240 yd³
None! If there was dirt in it then it wouldn't be a hole.
Assuming the 28 feet refers to the diameter of the circle, the answer is 1231.5 cubic feet, approx.
261.66
478.75 gallons (rounded) for every inch the water is deep.