DUTY AND MEASUREMENT OF WATER. 1 49 



division boxes, modules, weirs and water registers. A 

 measuring device is not always necessary, especially 

 where one has his own private water-supply, but in 

 taking water from public canals it is always more satis- 

 facflory to have an arrangement by which the a(5lual 

 intake of water may be determined, and the Colorado 

 statute now prescribes this requirement. 



A Miner's Inch. — As before specified, a miner's 

 inch may vary considerably, as it is rated with a 

 pressure of from four to six inches. We should say 

 that a safe calculation may be made with a five-inch 

 pressure as a medium of computation. A flow of 

 water through such an inch aperture is called a miner's 

 inch. To find the number of gallons in miner's inches, 

 multiply the given number of miner's inches by 14.961, 

 pointing off five decimal places. The result gives the 

 number of gallons discharged per second. To find the 

 number of miner's inches in gallons, divide the num- 

 ber of gallons flow or discharge per minute by 8.9766. 

 The result will be the number of miner's inches 

 sought. One miner's inch will flood ten acres a year 

 1.45 feet deep, 14.49 acres a year one foot deep, 18. 11 

 acres a year nine inches deep. A continuous miner's 

 inch will irrigate one acre of garden or orchard nicely. 



Divisors. — It often occurs that in taking water 

 from a ditch two consumers will use one sluiceway or 

 box, in which event a divisor is required. In using a 

 divisor there is no Unit of measure, and none is 

 needed. In its most common form the divisor consists 

 of a partition dividing the channel into two portions in 

 proportion to , the respedlive claims. This, in eft"ec5t, 

 assumes that the velocity is uniform across the Whole 



