302 



THE IRRIGATION AGE. 



WATER MEASURING DEVICES 



(Continued from page 295) 



very large quantities. The cost of the structure for 

 holding the 12-inch meter will cary from $10 to 

 $15. It is stated by those who have developed this 

 meter that any kind of an orifice in which the meter 

 can be inserted so that its axis is vertical will do very 

 nicely after the meter has been calibrated to suit that 

 type of orifice. 



From a test of a 12-inch Hill meter at Davis it 

 appears that this size of the meter will register the 

 quantity passed within 1.5 per cent for discharges of 

 from 1 to 3.5 cubic feet per second. For discharges of 

 less than 1 cubic foot per second, more water passes 

 the meter than is registered. For discharges of 3.5 

 cubic feet per second the water boiled up through the 

 opening so as to submerge the counter of the meter 

 tested. By increasing the length of shaft of the meter 

 higher discharges than this can be crowded through 

 the 12-inch meter, but the greater loss of head required 

 makes the use of larger meters preferable. 



The loss of head or fall in the water required for 

 this meter varied from 1 inch, when carrying 1 cubic 

 foot per second, to 6 l / 2 inches, when carrying 3.5 cubic 

 feet per second. 



The Hill meter seems adapted to use under the 

 usual conditions of irrigation practice. It is simple 

 and has few wearing parts. The head required for 

 the different sizes is less than that needed for the use 

 of weirs. The record of the total quantity of water 

 passed can be read in uits of .001 acre-foot. 



The Hanna meter has not yet been tested in the 

 Davis laboratory. This meter has been designed by F". 



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IRRIGATION AGE, 30 North Dearborn St., Chicago, HI. 



W. Hanna, supervising engineer of the U. S. Re- 

 clamation Service. The present retail price is $50. 

 Figure 25 is taken from a photograph of one of these 

 meters; figure 13 shows one installed with a Cipolletti 

 weir. 



The Hanna meter differs from the Dethridge, 

 Grant-Michell, and Hill meters in being a device that 

 registers the quantity passing through some other de- 

 vice rather than itself making the measurement. It 

 differs from an ordinary water register in that it reg- 

 isters the quantity of water passing rather than merely 

 the height of the water in some device. It can be in- 

 stalled in connection with a weir, a rating flume, an 

 open channel or a submerged orifice, or an orifice with 

 free discharge, and will indicate on a counter, directly 

 in acre-feet, the quantity of water passing. The mech- 

 anism of the meter is inclosed in a dust-proof metal 

 box, shown in figure 13, and when installed this metal 

 box rests on the top of a stilling box, also shown in 

 the illustration, which communicates through a pipe 

 with the stream being measured. A float resting on 

 the water of the stilling box and an 8-day clock to- 

 gether operate the meter. 



The next article will discuss Water Registers and Cur- 

 rent Meters and also ti'i/l include the story of hoiv some of 

 the Meters mentioned above were tested. 



Idaho is after the water wasters. Several have 

 been fined. As in other western states, there is a 

 shortage of water this year in Idaho. Water wast- 

 ers not only rob fellow settlers of water and injure 

 their own lands, but they frequently ruin roads, 

 thereby hurting whole communities. 



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United States Press Bureau 



Rand McNally Bldg. V Chicago 



