To fill it all the way to the top (33") would require about 2,336 gallons of water.
About 5,730 gallons.
6016 Gallons
About 7,645 gallons.
to calculate the content of the pool go to this link
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.
Round walls were harder to knock down than right angled walls. If you hit a round wall not much damaged would be made but a right angled wall would cave in.