To find the answer to your question, multiply the length times the width times the average depth and multiply times 7.5. The answer is the number of gallons in a swimming pool.
15187.5 gallons
615,142 gallons of water are needed to fill this cylinder.
17,953.2 gallons
It will take 5,104.1 gallons of water to fill this cylinder.
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.
7222 cubic feet of water is equal to approximately 54,024.3 US gallons. (1 cubic foot = 7.480519481 gallons)
(3.5 feet) * PI * ((9 feet)^2) = 6 662.46122 US gallons
Three feet of water in a 12-foot round pool is about 2,550 gallons.
If you fill it with 4 feet of water (48 inches), the pool will contain about 5,310 gallons of water.