Can swimming pools stay empty during the winter season?

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You asked:

Can swimming pools stay empty during the winter season? — Jay, Las Vegas, Nev.

Marshall Brain Answered:

As a general rule, it is a bad idea to leave a pool empty at any time, but especially in the winter. The problem is that if the ground gets saturated, the empty pool acts like a big boat and floats out of the ground. You can see two examples of this phenomenon in the following videos:

For more info see:
- How Swimming Pools Work and
- Why can boats made of steel float on water when a bar of steel sinks?

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