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Miners Inch

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Generally Speaking
It is the quantity of water that will flow through a One(1) Inch Hole

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The quantity of water that will flow through an orifice that is One(1) inch across
with this orifice being in a vertical surface
under a stated head of water

The shape of the orifice and the head vary in different places in the World
In the Western United States, the orifice is square and the head is from 4 to 9 inches above its center
In Europe, the orifice is round and the head is from 1/2 to 1 inch above its top

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One source describes this as the quantity of water that will escape through an aperture
one inch square
through a two-inch plank with a steady flow of water standing six inches above the top of the aperture
the quantity so discharged amounting to 2274 cubic feet in twenty-four hours.

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38 Miners Inches equals 1 cfs in Colorado

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40 Miners Inches equals 1 cfs in Arizona, Nevada, Montana, Oregon.

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That is 11.25 gallons per minute [1/40th of a cfs]
if you are in Northern California, Nevada, Arizona, Oregon, Montana
but only 9.0 Gallons per minute [1/50th of a cfs] if you are in Idaho, Kansas, Nebraska, South and North Dakota
New Mexico, Utah, Washington, or Southern California

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One(1) Miners Inch will irrigate approximately two acres of pasture
One(1) Miners Inch is equal to: 11.22 gallons per minute or 16,156 gallons per 24 hours or 9.07 acre feet per irrigation season.

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Usually inicating between 2,000 and 2,600 cubic feet per 24 hours

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Please be advised that the miners inch does NOT represent a fixed and/or definite quantity of water

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We recommend that it NOT be used
Use Cubic Feet per Second [cfs] instead

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Some associated Conversions:
1 Cubic Foot = 7.48 Gallons
1 Acre Foot = 43560 Cubic Feet or 325829 Gallons
1 Cubic Foot per Second [cfs] = 448.8 Gallons per Minute or 1.9835 Acre Feet per Day or 40 Miners Inches [Arizona]

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Last Edited:
30 September 2002 @ 07:47amMST