38 KEPORT OF OFFICE OF EXPERIMENT STATIONS. 



haA-e been installed. Experiments have likewise been conducted to 

 determine the duty of water on alfalfa, wheat, and corn. 



Some interesting results have been obtained from experiments on 

 the canals of the San Joaquin Valley to determine the eii'ect of 

 velocity upon seepage losses. 



In southern California the investigations have included the meth- 

 ods and cost of cleaning canals, a study of the organization of mutual 

 water companies, cost of pumping water, and the storage of flood 

 water in the gravel beds of the Imperial Valley. 



In addition to this work a study is being made of the conditions in 

 Eussian River and Napa River Valleys, in northern California, and 

 in Santa Barbara and Ventura Counties, in southern California, to 

 show the advantage of irrigation in regions where irrigation is not 

 essential to crop production. 



The Berkeley office is headquarters for instruments under the 

 charge of E. J. Hoff, where instruments from all parts of the Union 

 are sent for repairs. Here also new devices for measuring water are 

 tested and both new and old current meters rated. 



The published reports ^ of the agents in California during the past 

 year comprise a bulletin on the Delivery of AVater to Irrigators, by 

 Mr. Adams; a circular containing a review of irrigation investiga- 

 tions in California, by the same author; a bulletin on Irrigation in 

 the San Joaquin Valley, Cal, by Mr. Cone ; a bulletin on the Use of 

 Underground Water for Irrigation at Pomona, Cal., by Mr. Tait; 

 and a bulletin on Irrigation in California, by Mr. Roeding. 



WASHINGTON. 



Mr. S. O. Jayne has been in charge of the work in this State for 

 the past seven years, with headquarters at Spokane. He has been 

 engaged for the most part in advising settlers regarding irrigation, 

 although some experiments have been conducted at the Sunnyside sta- 

 tion to determine the duty of water, evaporation losses, etc. A care- 

 ful study has been made of the methods in vogue in districts where 

 all the available flow of streams is now diverted for irrigation pur- 

 poses with a view to bringing about a more economical use of the 

 water and thus extending the irrigated area. The excessive use of 

 water in some of the most fertile valleys has caused thousands of 

 acres to become waterlogged, making drainage necessary. In other 

 sections the soil is extremely porous and requires large quantities of 

 water, and the problem there is how to prevent deep percolation be- 

 yond the roots of the plants. Through the efforts of this office 

 much improvement has already been made in irrigation practice. 

 Large areas of land in Washington are well adapted to fruit rais- 



1 U. S. Dept. Agr., Office Expt. Stas. Buls. 229, 236, 237, 239 ; Circ. 108. 



