The Type of People who will predominately be using the pool, EG: Adults with young children or elder adults, or children-teenagers. In most cases the depth of the pool will be determined by the long term use. If you have a large family then some deeper 1.5-2.0M depth could be good for playing games in, but if you consider its use for 20 years when the parents are the only ones using it & they are older then possibly a 1.2-1.4M overall depth would be better.The Possibility of Enclosing the Pool, due to weather etc. This could be necessary in colder climates to obtain long term usage. In this case the pool may be better set closer to the house to take advantage of one or more walls. Also consider partial covers with open sides to reduce UV damage to the users.
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Recreational swimming pool users, particularly children, don’t require great depth and it is adequate to provide a sloped floor which goes from a minimum depth of 36 inches to a maximum of 4 or 5 feet. A purely recreational pool also does not need to be any particular shape, so you can pick a shape to complement your lot.
On the other hand, athletic lap swimmers need a long and narrow space with at least 4-5 feet depth throughout, to avoid touching the bottom while swimming, and to ensure that turns at the pool’s ends can be executed safely. For competitive swimmers in training, providing a length of 25 yards or 25 meters will enable them to develop a swimming style usable in competition.