ACKNOWLEDGMENT 



The author wishes to acknowledge the cooperation and help 

 rendered by F. C. Ebert and R. S. Lord, of the United States Geological 

 Survey, and C. A. Taylor, of the Bureau of Agricultural Engineering, 

 United States Department of Agriculture, in preparing this report. 

 Valuable aid was also rendered by the Orange County Flood Control 

 District, through M. N. Thompson, chief engineer, in collecting part of 

 the field data. The report was reviewed by W. G. Hoyt, A. C. 

 Spencer, C. H. Pierce, and 0. E. ]\leinzer, and was edited by B. H. 

 Lane, all of the United States Geological Survev. 



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