436 KEPOKT OF OFFICE OF EXPERIMENT STATIONS. 



dealt with are the amount of water used in irrigation, the losses from canals by seep- 

 age and evaporation, and the causes and effects of these losses. Data are presented 

 showing the cost and value of pumping for irrigation, and the value of water per 

 acre-foot as measured in the crops grown. Efforts to improve the methods of meas- 

 uring and recording the volume of water used are described, and some of the instru- 

 ments designed for this purpose are illustrated. Studies to determine the amount 

 and effect of silt on the operation of canals and the permanence of reservoirs are 

 described, and the relation of all facts gathered to the problems of future develop- 

 ment pointed out. 



Bulletin No. 105 o Irrigation in the United States. Testimony of 

 Elwood Mead, Irrigation Expert in Charge, before the United States 

 Industrial Commission, June 11 and 12, 1901. Pp. 47, pis. 12, fig. 

 1. Price 15 cents. 



The testimony contained in this bulletin presents a review of the irrigation situ- 

 ation in the United States, including not only the arid region of the West, but also 

 the humid sections of the South and East, and also deals briefly with the practical 

 aspects of extending public aid to irrigation either through the State or National 

 Governments. The heads under which the review is given are as follows: Begin- 

 nings of irrigation in the United States; Importance of irrigation in the United 

 States; Irrigation in the United States the result of private enterprise; Evolution of 

 water laws in the arid region; Establishment of titles to water; Meaning of term 

 ''water right," and water-right contracts; Building of canals and distribution of 

 water; Losses of water by seepage; Filling of canals by silt; Controversies over titles 

 to water; Principles governing water rights in Canada and Wyoming; Storage of 

 water for irrigation; Irrigation a State question; Leasing of the public grazing lands; 

 National aid extended by land grants; Cost and value of irrigation; Products of the 

 arid region; National aid for irrigation; Interstate water-right complications; Irriga- 

 tion in the humid sections, and Filling of reservoirs by silt. 



