The volume is 331,750 cubic feet.
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The volume of any cylinder is (pi) x (radius)2 x (length) .The biggest part of working with this one is getting the units all consistent.Radius = 1/2 the diameter = 7 inches = 7/12 foot1 mile = 5,280 feet4 miles = 21,120 feetVolume = (pi) x (7/12)2 x (21,120) = 22,577.579 cubic feet (rounded)That's the volume of the pipe. I have no way of knowing how much water may bein it, and I suspect maybe you don't either. A pipe 4 miles long may have who-knows-how-much mud, air, stones, bugs, mice, acorns, fish etc. in it.That volume, incidentally, is the same as 168,892 gallons. (rounded)
The volume of the pipe is 0.2078 gallon per foot of length.I have no idea how much water might be in it.
2 1/4 inch is 9/4 inch long pieces, so if pipe is 36 in long then 36/divided by 9/4 is 36 times 4/9 = 16 pieces
Area = pi x radius^2 Multiply that answer by 30feet and you have the volume of the pipe.
If that's 3/4 feet, there will be 48 of them.