6 inches = 1/2 foot
(40-ft x 20-ft x 0.5-ft) x (12 inches per foot)3 / (231 cubic inches per gallon) = 2,992.2 gallons (rounded)
If you fill it with 4 feet of water (48 inches), the pool will contain about 5,310 gallons of water.
If this is a round pool that is 27 feet across by 52 inches tall and you fill it with 4 feet (48 inches) of water, the total volume would be 17,204 gallons of water.
885 gallons.
17,953.2 gallons
If this is a round pool 18 feet across and you fill it with 4 feet of water, it contains 7,646 gallons of water.
It will take 5,104.1 gallons of water to fill this cylinder.
If you fill it with 4 feet of water (48 inches), the pool will contain about 5,310 gallons of water.
If this is a round pool that is 27 feet across by 52 inches tall and you fill it with 4 feet (48 inches) of water, the total volume would be 17,204 gallons of water.
885 gallons.
615,142 gallons of water are needed to fill this cylinder.
17,953.2 gallons
Depends on the depth. If it is 4 feet deep and it is cicular with a diameter of 24 feet then you have approx. 13,553 gallons of water. If it is 3 feet deep then you have approx. 10,152 gallons of water.
If this is a round pool 18 feet across and you fill it with 4 feet of water, it contains 7,646 gallons of water.
An 18-foot round pool with 3 feet of water contains 5,734.8 gallons of water. If you fill it to 4 feet deep it increases to 7,646 gallons of water.
It would require 2,937.6 US gallons of water to fill the pipe.
If you fill it to four feet deep, the total is 10,408 gallons of water.
A pool this size with an average depth of 16 feet requires 462,560 gallons of water to fill it to the top.