IRRIGATION IN DRY-FARMING 333 



trees, and shrubs, and grasses, and the family garden. 

 To secure these things a certain amount of irrigation 

 water is required. It may be added that dry-farms 

 on which such homesteads are found as a result of the 

 existence of a small supply of irrigation water are 

 much more valuable, in case of sale, than equally 

 good farms without the possibility of maintaining 

 homesteads. Moreover, the distinct value of irriga- 

 tion in producing a large acre yield makes it desirable 

 for the farmer to use all the water at his disposal for 

 irrigation purposes. No available water should be 

 allowed to flow away unused. 



Available surface water 



The sources of water for dry-farms fall readily 

 into classes : surface waters and subterranean waters. 

 The surface waters, wherever they may be obtained, 

 are generally the most profitable. The simplest 

 method of obtaining water in an irrigated region is 

 from some irrigation canal. In certain districts of 

 the intermountain region where the dry farms lie 

 above the irrigation canals and the irrigated lands 

 below, it is comparatively easy for the farmers to 

 secure a small but sufficient amount of water from 

 the canal by the use of some pumping device that 

 will force the water through the pipes to the home- 

 stead. The dry-farm area that may be so supplied 

 by irrigation canals is, however, very limited and is 



