In Australia, 19ᵗʰ – 20ᵗʰ century, a unit of stream flow used in apportioning water among miners, = 1 cubic foot of water per second.
“A ground sluice-head is a body of water 3 inches by 12 inches, gauged in the following manner:— A box 6 feet in length and 12 inches in width, with a scale of inches marked on the inner side of the lower end, shall be placed at the head of the race, having a fall not exceeding 6 inches in the entire length of it, and the gauge of water shall be taken at the mouth of the box where the water is discharged. When the length of the race exceeds 1 mile, the width of the box may be increased half an inch for each mile. (Regulation 70.)” (Page 128 in the source cited below.)
“A box sluice-head is a body of water 1 inch by 12 inches.” (Page 180, same source, presumably gauged in the same way.)
As with the miners' inch in the United States, precision gives way to practicality. All the water was directed into a trough 12 inches wide and open on both ends, and the flow judged by the depth of the water at the end of the trough.
Department of Mines, Queensland.
Queensland Mining Guide. 1949 Edition.
A. H. Tucker, Government Printer, Brisbane.
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Last revised: 23 January 2002.