If it is a public pool designed for diving, it may slope from 3.0 to 5.5 m (10 to 18 ft) in the deep end. A children's play pool may be from 0.3 to 1.2 m (1 to 4 ft) deep. Most public pools have differing depths to accommodate different swimmer requirements.
Also question is, how deep does a pool have to be for a high dive?
Department of Health Requirements: Prohibits head first diving in water depths less than 8 feet. Restricts use of starting blocks to competitive swimmers or swimmer training activities. Requires new installation (effective October 7, 1992) of starting blocks to be in the deep end in at least 6 feet of water.
How deep do you go when you jump into water?
So, as a rough guide, if you plan to land feet first and in a straight, upright position, you're going to need at least 8 feet of water. If you're up any higher than 5 or 6 feet, you'll need 10 feet or more, and above 20 feet you'll need the full 16 foot depth to insure you do not break bones hitting the bottom.