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To determine the amount of water in an oval pool, calculate the area of the oval (elipse) and multiply that by the depth, then take that volume and plug it into a conversion factor. There is a "rule of thumb" for finding the area of an oval. It makes for a good approximation and allows us to avoid the calculus. It's l(length) x w (width) x 0.8 which in this case is 30 x 17 x 0.8 = 408 ft2 for the area. Multiply that by the depth, 5.5 ft, and you've got 2244 ft3 for a volume. Water has about 7.48 gallons per cubic foot, so your pool will hold about 16,785 gallons of water when filled to the brim. Sloping sides will strip something off that figure, obviously.
What else can I help you with?
How many gallons of water are in a 30ft by 10ft rectangle pool?
It depends how deep it is.
How many gallons in a 6' round 18 deep pool?
300 gallons.
How many gallons are in a 12 ft round pool that is 3 ft deep?
About 2,550 gallons.
How many gallons of water is in a 10 foot round 3 feet deep?
1,770 gallons.
How many gallons is in 13Ft by 42In deep pool?
Assuming your pool is round about 800 gallons.
How many gallons of water for a 15 feet 56 deep round pool?
6,200 gallons.
How many gallons of water are in a 32 ft round and 30 ft deep?
181,248 gallons.
How many gallons are in a 15 foot round pool that is 42 inches deep?
About 4,650 gallons.
How many gallons of water in a 24ft round pool?
3384 gallons for every foot deep it is.
How many gallons in a 26 feet by 4.5 feet deep round pool?
About 17,950 gallons.
How many gallons are in a 21 foot by 4 foot deep round pool?
10,408 gallons.
How many gallons in a 15 ft round by 5 ft deep pool?
5,677 gallons
