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Just to make it easy on ourselves, we're going to assume that the slope is constant ...

the pool is 3' deep at one end, 8' deep at the other end, the bottom is flat, with a constant

slope and no breaks or level places. Then we can work it using the average depth of 5.5' .

1 cubic foot = 1,728/231 gallons

Volume = (18' x 36' x 5.5') = 3,564 cubic feet (= 132 cubic yards) = 26,660.6 gallons (rounded)

Q: How many gallons of water fill an 18'x36' rectangular pool 3'deep to 8' deep?

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That will depend on how deep you want the water to be.

Cannot be answered with only these measurements. You need to specify what shape the pool is. Also, for a rectangular pool, the length, width and depth are needed. For a round pool, the diameter and depth are needed.

18 x 36 ______ 108 540 ______ 648 gallons 18x36 = 648 square feet. Assume depth of pool 5 feet filled to brim, total volume 18x36x5 = 3240 cubic feet. 3240 multiplied by 6.22883 = 20181 UK gallons (rounded) 3240 multiplied by 7.48052 = 24237 US gallons (rounded)

If rectangular: Lenght X Width X Average Depth X 7.5 = Volume in gallons.

If its an oval pool approx 7800 gallons at full capacity. If its rectangular pool then approx 9000 Gallons.

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That will depend on how deep you want the water to be.

Cannot be answered with only these measurements. You need to specify what shape the pool is. Also, for a rectangular pool, the length, width and depth are needed. For a round pool, the diameter and depth are needed.

18 x 36 ______ 108 540 ______ 648 gallons 18x36 = 648 square feet. Assume depth of pool 5 feet filled to brim, total volume 18x36x5 = 3240 cubic feet. 3240 multiplied by 6.22883 = 20181 UK gallons (rounded) 3240 multiplied by 7.48052 = 24237 US gallons (rounded)

A tank this size can hold a maximum of 3,590.65 US gallons of water.

If rectangular: Lenght X Width X Average Depth X 7.5 = Volume in gallons.

Close to 24,000 gal if it is rectangular.

If its an oval pool approx 7800 gallons at full capacity. If its rectangular pool then approx 9000 Gallons.

To calculate the gallons you also need the average depth. Then you take lenth X width X average depth = cubic feet of water. cubic feet of water X 7.48 {gallons per cubic foot} = total gallons.

Gallons in a rectangular tank =(tank's length in inches) times (tank's width in inches) times (water depth in inches) divided by (231)

It depends on the dimensions of the tube, but the question did not provide all of them.

Assuming it is truly rectangular (opposed to free form) it's 15,700 gal

4400 gallons, or 4,398.24 gallon rounded off.