SOLUTION: Need formula for this problem:How many gallons of water are in a 12 inch pipe 1 mile long?

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Question 483893: Need formula for this problem:How many gallons of water are in a 12 inch pipe 1 mile long?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Vol+=+pi%2Ar%5E2%2Ah, r = 6, h = 5280 ft, volume in cubic feet
Vol+=+190080%2Api cubic feet
= 190080*pi*1728 cubic inches
= 328458240*pi cubic inch
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1 gallon =~ 231 cubic inches = 231/1728 cu ft
Vol = 190080*pi*1728/231 gallons
Vol =~ 4467022 gallons
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Why do you need to know this?
We have a system at Charleston SC that has 36" pipes 2 miles long from the storage tanks to the harbor.
The volume in the pipes is called "line pack."