410 



THE I R R I G A T I N AGE 



(Continued from page 408.) 

 basin are in this respect yet prac- 

 tically untouched. 



Observations by United States Geo- 

 logical Survey. 



In a basin so liberally provided 

 with natural resources it is a funda- 

 mental necessity, in planning for th; 

 ufilization of the river, to ascertain 



the amount of water available in the 

 main stream and its principal tribu- 

 taries, so that future developments, 

 as well as those now under construc- 

 tion, can be suitably designed in type 

 and capacity. For a long period of 

 years the United States Geological 

 Survey has been making observations 

 and measurements at many important 

 points in the ColoTulo basin, and the 



^Planning for the Future of Your Daughter 



WRITE FOR INFORMATION ABOUT 



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TERM OPENS 

 SEPTEMBER 

 SIXTEENTH 



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latest published information on the 

 subject is contained in Water-Supply 

 Paper 289 of the Survey, by Engineers 

 W. B. Freeman, E. C. La Rue and H. 

 D. Padgett, which is a progress re- 

 port of river-flow measurements in 

 this basin for the year 1910. Gaging 

 stations were maintained at a large 

 number of river points, covering 

 Grand river and tributaries in Colo- 

 rado; Green river and tributaries in 

 Utah, Colorado and Wyoming; the 

 San Juan basin in northwestern New 

 Mexico; the Little Colorado river 

 basin in Arizona; and finally the dis- 

 charge near the mouth of the main 

 stream at Yuma. Ariz. These records 

 are not only of local value for guid- 

 ing economic development, but they 

 have an international significance in 

 connection with the difficulties that 

 have been encountered in the control 

 of the Colorado near its mouth in 

 Mexican territory. 



Necessity for Control of the River. 



The control of the Colorado for the 

 prevention of further outbreaks such 

 as its recent diversion into the Salton 

 Sea must involve thorough knowl- 

 edge of the tributary flow, even in 

 the high regions of its headwaters, in 

 Colorado, and the ultimate steps 

 taken to prevent disastrous inunda- 

 tion will in all probability involve 

 the control of these upland tributaries. 



The size of Colorado river is indi- 

 cated by its discharge at Yuma in the 

 year 1910. The heaviest discharge 

 was in May, 70,300 cubic feet a sec- 

 ond; the smallest discharge was in 

 October. 4,300 cubic feet a second. 



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