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 
