81 



Kit^'urc 13 shows the duily How of the Republican ciuml in acre-feet 

 dui'ino- the season of 1908, and also the depth of water received by the 

 land each month. 



SKAI.KAIIO CANAL. 



This canal was built for the purpose of irrigating about 2,000 acres 

 of land located above the Wjird canal. It is 7 miles long-, and over 

 one-third of this distance the water is carried in either a wooden tlume 

 or redwood-stave siphon. The siphon is 36 inches in diameter and the 

 flume has a sectional area of 12.5 square feet. On a grade of 0.1 foot 

 to the hundred feet the mean velocity is about 5 feet per second, thus 

 producing a maxinuun discharge of over 60 cubic feet per second. 

 Sixteen hundred acres were irrigated in 1901, and 1,975 acres in 1902 



Fig. 13. — Daily discharge of Republican canal, 1903, and depth of water received by land. 



and 1903. The monthly discharge and deptlis to which this would 

 cover the land is given below: 



Duty of water under Skalkaho canal for 1901, 1902, and 190S. 



Month. 



April 



May 



June 



July 



August 



September . 



Total. 



1901. 



Discharge. Depth 



Acre-feet. 

 506 

 1, 775 

 1,477 

 2,290 

 1,447 



7,495 



Feet. 

 0.32 

 1.11 



.92 

 1.43 



.90 



1902. 



Discharge. Depth 



Acre-feet. 

 469 

 2,097 

 3,336 

 3,335 

 2,582 

 1,618 



13, 437 



Feet. 

 0.24 

 1.06 

 1.69 

 1.69 

 1.31 



Discharge. Depth 



Acre-feet. 

 490 

 1,936 

 3,040 

 3,308 

 2, 314 

 1,542 



12, 630 



Feet. 

 0.25 



.98 

 1.54 

 1.67 

 1.12 



.98 



6.34 



GIRD CREEK DITCHES. 



The waters of Gird Creek, which flow from the mountains on the 

 east side of the Bitter Root Valley, are diverted on the lands of the 

 Bitter Root stock farm })v three canals. One diverts water to the south 



