DllY A XI) MEASUREMENT OF W ATE It. 115 



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 

 HUM li tun 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 givm 

 number of miner's inches by 14.061, pointing off five 

 decimal places. The result gives the number of gallons 

 discharge per second. To find the number of miner's 

 inches in gallons, divide the number of gallons flow or 

 discharge per minute by 8.97GG. 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 gar- 

 den 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 parti- 

 tion dividing the channel into two portions in proportion 

 to the respective claims. This, in effect, assumes that 

 the velocity is uniform across the whole cross section, 

 which is not the case even in a uniform channel, and is 

 much less so in one irregular or in poor repair. Such a 

 division is to the disadvantage of the smaller consumer. 

 The nearer the velocity is uniform across the whole 

 channel, the better this method of division. Accord- 

 ingly, means are frequently taken, by weir-boards or 

 otherwise, with this object in view, but generally with 

 indifferent success. A screen would accomplish this 

 one object better, but the objections to its use are too 

 many in most places to render it practicable. Figure 39 

 represents one of the most common forms of divisors. 



