Volume of a cylinder = (pi) x (Radius)2 x (Length)
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A good place to measure is the diameter of the circular end. That gives you the area of the circular end, and the only other number you need in order to calculate the cylinder's volume is its straight length.
A round swimming pool is a right circular cylinder, so you can use the formula pi times the radius squared times the height to calculate the volume.
The volume of any cylinder is (pi) x (radius of the circular end)2 x (length of the cylinder)
The volume should not change if the cylinder is rigid.
Volume = (Pi/4) * diameter2 * height or volume = Pi * radius2 * height