78 



The discluirgc of the ditch and the depth to which it would cover 

 the land are shown in the following table: 



Duty of water under the Kughen canal in 1902 and 1903. 



Month. 



June 



July 



August 



September . 



Total. 



1902. 



Discharge. Depth 



Acre-feet. 

 2,643 

 3, 60i 

 1,079 



Feet. 

 1.69 

 2.30 

 .69 



7,326 



1903. 



Discharge. Depth." 



Acre-feet. 

 1,985 

 3,862 

 1.712 

 1,488 



9,047 



Feel. 



1.27 



2.47 



1.09 



.95 



5.78 



a The area irrigated in 1903 is assumed to be the same as in 1902. 



Figure 12 shows the flow of this canal in 1903 and likewise the 

 amounts of water applied to the land during each month. 



Fig. 12. — Daily discharKC of Kughen canal, and depth of water received by land, 1903. 

 CANALS OF KAVALLI COLTNTV. 



The land of Ravalli County, Avhich contains in round numbers 

 1,850,000 acres, may be divided into three classes. The western and 

 to a considerable extent the southern part of the county is well tim- 

 bered and mountainous. Through the central portion flows the Bit- 

 ter Root River, on either side of which are to be found large tracts of 

 arable and irrigable land, and in the east the land is undulating and 

 hilly and chiefly devoted to grazing. On the west of the Bitter Root 

 River, which flows north to meet the Missoula, the dense groves of 

 pines, firs, and tamaracks extend from the borders of the valley and 

 in many places from the river bank to the summit of the Bitter Root 

 Range, from 10 to 15 miles distant. On this steep mountain slope, 

 which rises at times 5,000 feet in 5 miles, the green of the pines 



