About 3 and 1/2 if you can arrange it anyway you want.
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15,320.1 US gallons of water.
a lot.
The answer depends on the units used for 16 x 32. Since you have not bothered to provide that crucial bit of information, I cannot provide a useful answer. The answer will depend on whether the depth increases linearly between the ends, also something that has not been specified.
If rectangular about 21,000 gallons if oval about 16,000 gallons
18,770 Gallons or round it up to 20,000 for calculation purposes.