The volume of the pipe is (pi) (R)2 (length) = 6,785.84 cubic inches = 29.376 gallons.
We have no way of knowing how much of that volume may contain water at any
particular moment.
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1.219197
45.9 US gallons.
The surface area of a sphere with a 24 inch diameter is 1809.6 square inches = 12.6 sq feet
If the radius is 18 feet - then the diameter is 36 feet. The circumference measurement is irrelevant !
A circle with an 8-inch diameter has a perimeter of 25.1 inches.