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I'm assuming you have a circular pool and its diameter is 15 ft (radius 7.5 ft). If you fill the pool up to the height of 4 ft, you can easily figure your volume using this equation:

V=(area of base)x(height)

V=(pi x r2) x (height)

V=3.14 x (7.5 ft)2 x 4 ft

V=706.5 ft3

There is 1 gallon per 0.133 ft3

Therefore, you need about 575 gallons of water to fill your pool.

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Q: How many gallons in a 15 ft wide and 4 ft deep pool?
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