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A Look at Miners Inches

Sluice with Pier and Bridge from 1837; miners inches, miner's inch; sluiceA miner's inch is not a measure of length, but it is the measurement of the rate of water flow in a miner's sluice. Flow was measured by a hole one inch square with a head of one inch. Generally, one miner's inch is a flow of 1.5 cubic feet per minute You will find references to "miner's inches" in old water right filings and notices, as well as older decrees governing water rights.

As water demand increased with the development of large-scale mining technologies and the development of irrigation uses, the miner's inch became an inadequate unit of measurement for flow rates, and was replaced by cubic feet per second.

A miner's inch is not the same in all of the states:

 State

 Number of miner's inches per CFS (cubic foot per second)

Idaho, Kansas, Nebraska, New Mexico, North Dakota, South Dakota

 50 miner's inches

 Arizona, California, Montana, Oregon

 40 miner's inches

 Other states

 38.4 miner's inches


 

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