First, we must know the formula for solving the volume of a cylinder, which is
. Since the water is only being filled to 5 feet, we do not care about the 0.5 feet of the height.
Using the formula, we need to plug-in the numbers for the radius (20 divided by 2 is 10) and height. Doing this, the equation should now look like this:
. When solving, the volume of the water is 1570 feet cubed.