I'm assuming that the pool is circular?
If so, volume is equal to pi x 13.5^2 x 4 = 2290 cubic feet.
One gallon is equivalent to 0.13368 cubic feet.
So total = 2290 / 0.13368 = 17130 (to 4 s.f.)
489.76 gallons of water.
17,204 gallons.
About 15,293 gallons.
About 7,600 gallons
About 17,204 gallons.
About 3,758 gallons.
3416 gallons
Approx. 20k gallons.
28,913 US gallons.
15,954 US gallons of water.
A 2-foot round pool with 12 inches of water is holding about 23.6 gallons of water.
20000