The volume of a cylinder is (pi) x (radius)2 x (length).
If a pipe has an inside diameter of 48 inches, then one foot of it has a volume of
(pi) x (24)2 x (12) = 21,714.688 cubic inches = 94.003 gallons (rounded)
We have no way of knowing how much water may be in it. It may even be empty.
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