from the GNU version of the Collaborative International Dictionary of English

  • n. a unit for the measurement of water. See Inch of water, under Water.
  • n. in hydraulic mining, the amount of water flowing under a given pressure in a given time through a hole one inch in diameter. It is a unit for measuring the quantity of water supplied.


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  • A traditional unit of water flow in the western United States that originally represented streamflow through an opening one inch square at a specified distance below the surface of the water. This distance varied from 4 to 6 inches, so depending on which state you're in, the actual unit size varies. In Idaho, for example, it is legally defined as 9 gallons (1.2 cubic feet) per minute; in Arizona, a miner's ince is 1.5 cubic feet per minute; in Colorado, it's 1.5625 cubic feet per minute.

    November 7, 2007