31 



The art'ii irrij^ated duriuiif the soasoii was obtaiiiod by a survoy made 

 for that piu'po.se. Care was ttikeii to eliiniiiate all waste land, so that 

 results obtained should represent the exact area devoted to crops. 



In the followino- table is ojven the area devoted to the various crops 

 raised on each farm entitled to water from the ditch: 



Area of croj)!< irrUjated undrr Kngften ditch, 1902. 



Deducting the 1,378.72 acres of summer-fallowed land, which 

 received no water during the season, gives the area devoted to irri- 

 gated crops as 1,56-1:. 85 acres. Of this area over half Avas devoted to 

 barley and the greater part of the remainder to oats, less than one- 

 tenth the area producing hay crops. 



The following summary shoAvs the duty of water as based upon the 

 area given above: 



Dvtij of vater under Kiujhen ditcit, 1902. 



Duration of irrigation SL'ason, .June 4 to August 16 days. . 74 



Area irrigated aiTes. . 1, 564. 85 



Water received by land acre-feet. . 7, 328. 00 



Depth of water used in irrigation feet. . 4. 68 



Depth of rainfall do . :^)3 # 



Total depth of water received ])y land do 5. 01 



Based on a period of seventy-four days, the average flow in the 

 canal at the rating flume was -19.9 cubic feet per second, showing a 

 duty of 31.34 acres per cubic foot per second; 1 inch was used for 

 every 0.78 acre. As the Avater is used near the head of the ditch no 

 correction need be made for seepage losses. 



DUTY OF WATER UNDER WEAVER AND STONE DITCH. 



As mentioned previously the Weaver and Stone ditch is representa- 

 tive of the small cooperative ditches which are quite numerous on the 

 West Gallatin. It heads on the east side of the river 6 miles below 

 the head of the Kughen ditch, i'rom the point of diversion the ditch 



33281— Xo. 172—06 3 



