Definition

• 1/60 ft³/s (472 mL/s) New Zealand
• 1/50 ft³/s (566 mL/s) southern California, Idaho, Kansas, Nebraska, New Mexico, North Dakota, South Dakota, Utah, Washington
• 1/40 ft³/s (708 mL/s) Arizona, northern California, Montana, Nevada, Oregon
• 1/38 ft³/s (745 mL/s) Colorado
• 1/36 ft³/s (787 mL/s) British Columbia

Explanation

The miner’s inch was derived from the amount of water that would flow through a hole of a given area and a given pressure (for example, 4-6 inches of water, or 1-1.5 kPa). The word 'inch' actually refers to the area of the hole in 'square inches'. State regulations sometimes forbid the use of the unit without its being associated with a definition in the same document.

External links

• description at sizes.com
• Arizona government definition
• Idaho government definition
• Nevada government definition
• South Dakota government definition