Irrigation and Drainage 127 
yield of beets is greater under irrigation than where water 
is not supplied. This is probably because irrigation makes 
possible the maintaining of a more desirable moisture- 
eT Eo ATO a CLO on We 
content in the soil than can be relied on from the rainfall 
alone. 
Sugar-beet culture is adapted to intensive farming on ac- 
count of the great amount of man-labor that must be spent 
on each acre in thinning and harvesting. This condition 
fits well into the small farms of the irrigated district. 
Sources of irrigation water. 
The most common and least expensive source of water 
for irrigation is found in running streams. A suitable dam 
is placed across the bed of the stream to turn water into 
the canal which carries it to the land to be served. The 
