miner's inch

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miner's inch

[′mīn·ərz ′inch]
(mining engineering)
The quantity of water that will escape from an aperture 1 inch (2.54 centimeter) square through a 2-inch-thick (5.08-centimeter) plank, with a steady flow of water standing 6 inches (15.24 centimeters) above the top of the escape aperture, the quantity so discharged amounting to 2274 cubic feet (64.39 cubic meters) in 24 hours.