It is important to know the volume of water in your pool to facilitate its maintenance. This allows you to choose the right filtration system, the right cleaning robot, the right heat pump to heat your pool and the right quantity of cleaning products to use.
Precision for height measurement; you should measure from the bottom of the pool to the surface of the water and not up to the height of the pool.
If you have a pool with different depths, take the smallest measure + the largest measure and divide into 2. You will have the average depth.