It depends on the cross sectional area of the pipe.
2.961 US gallons
12 feet, 6 inches
261.66
4*pi = 12.6 cubic feet.
It depends on how long the pool is.
A 100-foot hose with an inside diameter of five inches can hold 102 US gallons of water.
44.88 gallons
Five feet six inches !
8 cubic feet.
A 100-foot pipe with an inside diameter of 12 inches has a maximum volume of about 78.54 gallons of water.
2.961 US gallons
This container could hold up to 3,949.71 US gallons of water.
A cylinder with these dimensions will hold up to 13.06 gallons of water.
12 feet, 6 inches
261.66
4*pi = 12.6 cubic feet.
Assuming the hose has a 3 in inner diameter; the answer is 50 x 12 x 1.5^2 x pi in cubic inches. Divide the answer by 12 for cubic feet. 4241.15 cubic inches or 353.43 cubic feet.