How low should you drain a inground swimming pool for not in use for children safety?

A drained swimming pool will be more dangerous to anyone who could fall into the pit. The pool will need Fencing around it that is sturdy and anti-tamper proof. What are your plans for rain water when it fills during a storm? What are your plans for when you have a lot of rain and the water table surrounding the pool rises enough to make the pool float out of the ground????