To fill it all the way to the top (33") would require about 2,336 gallons of water.
6016 Gallons
About 5,730 gallons.
About 7,645 gallons.
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Approx 3437 Imperial gallons.
At 7.48 gallons per cubic foot that is 3.14x30x30/4x52 x7.48 /12 = 22,900 gallons
50
It holds up to 10,408 gallons of water.
48*18=864
About 4,490 gallons of water.
About 2,794 gallons of water.
The answer to the riddle is a sieve. A sieve is round and can be deep like a tub, but its numerous holes mean that it can't hold water, regardless of how much is poured into it. Thus, no matter how much water you try to fill it with, it will never be full.