If you know the length width and depth (or height) of the pool, then you can find the volume.
For example length = 30 feet width = 10 feet depth = 8 feet volume = length*width*depth = 30*10*8 = 300*8 = 2400 cubic feet This is assuming that the depth stays the same throughout the pool. Though some pools (or most?) have the depth gradually get deeper as you move toward the deep-end. To keep things simple however, the assumption is that the bottom is completely flat and it doesn't gradually get deeper.
