ACKNOWLEDGMENT 



The aiithors acknowledge the assistance rendered by members of 

 the Division of Irrigation of the Bureau of Agricultural Engineering, 

 United States Department of Agriculture, especially Dean W. Blood- 

 good, Associate Irrigation Engineer, Dean C. Muckel, Junior Civil 

 Engineer, and H. W. Kistner, who assisted in the preparation of the 

 manuscript, and A. Lincoln Fellows, Senior Irrigation Engineer, who 

 edited it. 



The advice and assistance of Harold Conkling, Deputy State 

 Engineer, is recognized. Acknowledgment is made of the assistance 

 rendered by P. C. Ebert, Jarret Oliver, and K. R. Melin of the United 

 States Geological Survey. W. P. Rowe of the Board of Water Commis- 

 sioners, City of San Bernardino, and M. N. Thompson, Engineer of 

 the Orange County Flood Control District, also rendered valuable 

 assistance. 



Acknowledgment is made to A. S. Amaral of the Appleton Land 

 and Water Company for providing the site for the experiment station 

 at Victorville, of the courtesies extended by II. S. Ward of the Arrow- 

 head Springs Company in the ColdAvater Canyon Investigations, and to 

 the Los Angeles County Flood Control District and San Gabriel Valley 

 Protective Association for furnishing the site for Baldwin Park Key 

 Station. 



Scientific names for native plants were determined at the Herba- 

 rium of the University of California. 



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