That varies depending mostly on latitude. The best way to know the answer for where you are is to find out the local minimum required depth for water pipes.
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6015.77 gallons
An in-ground pool that is 40 feet by 20 feet with the shallow end being 3ft deep and the deep end being 9ft deep has a volume of approximately 35,900 US gallons. (The depth of variable depth pools is generally calculated by adding the shallow and deep ends and dividing by two).
3.4 miles deep
20000
26 square feet.