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The first thing to do is find the volume of liquid in 10 feet of the pipe.

A 1" diameter pipe has an area of 0.785398163397448 square inches.

10' = 120"

So 10' of 1" pipe holds 94.24777960769376 cubic inches - let's round it to 94.25

94.25 per second = 5655 per minute

An Imperial gallon measures 0.16054365 cubic feet.

1 cubic foot = 1728 cubic inches

0.16054365 cubic feet = 277.4194272 cubic inches - let's round that to 27.4

5655 / 27.4 = 20.3857 - call it 20.4 Imperial gallons per minute

A US gallon measures 0.13368056 cubic feet

1 cubic foot = 1728 cubic inches

0.13368056 cubic feet = 231.00000768 cubic inches - let's call that 231

5655 / 231 = 24.4805 - call it 24.5 US gallons per minute

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Q: How to Calculate gpm through a 1in pipe at 10fts?
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