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The miner's inch is a unit of flow in terms of volume per unit time, usually in relation to flow of water. The definition of a miner's inch varies by location. In hydraulic mining and some forms of placer mining, as well as ore dressing, a large and regular supply of water is needed. The miner's inch is a method of measuring the amount of flow a particular water supply system (such as a flume or sluice) is capable of supplying. 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'. ==Definition== Historically, the unit lacked a firm definition or equivalent measurement, and varied by location, leading to confusion within the mining industry. In 1905, its usage in California was standardized.〔 Today, the standards are: *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 State regulations sometimes forbid the use of the unit without its being associated with a definition in the same document. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Miner's inch」の詳細全文を読む スポンサード リンク
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