EDMUND G. BROWN 

 GOVERNOR OF 

 CALIFORNIA 



HUGO FISHER 



ADMINISTRATOR 



RESOURCES AGENCY 



THE RESOURCES AGENCY OF CALIFORNIA 



DEPARTMENT OF WATER RESOURCES 



1120 N. STREET, SACRAMENTO 



June 20, 1963 



Honorable Edmund G. Brovm, Governor 

 and Members of the Legislature 

 of the State of California 



Gentlemen: 



I have the honor to transmit herewith Bulletin 

 No. 113, "Interim Report on Vegetative Water Use Studies, 

 19514-1960," of the Department of V/ater Resources, dated 

 May 1963. This report describes techniques and approaches 

 ■which have evolved, and summarizes data on vegetative con- 

 sumptive use or evapotranspiration. Interrelationships 

 between these data are set forth, together with evapotran- 

 spiration values for some crops in Central and Northern 

 California agricultural areas. This is a continuing study 

 with many conclusions yet to be reached. 



Data pertaining to evapotranspiration, irrigation 

 requirements, and agricultural hydrology are basic to most 

 water resource development studies. With the continued 

 growth of the State, necessitating more complex and costly 

 water development facilities, there is increasing need for 

 more accurate water use data. Such data will enable de- 

 veloped surface and ground water resources to be used 

 effectively, and will facilitate design and operation of 

 land drainage systems. 



The studies reported herein were initiated in 195U 

 as part of the Northeastern Counties Investigation. A con- 

 tinuing Vegetative Water Use Studies Program was established, 

 and the studies were broadened, sls a result of Senate Bill Ii3li; 

 1959 Legislative Session. Specific authorization for these 

 studies is set forth in Section 226(e) of the Water Code. 



Sincerely yours ^ 



' ' T)t rpct.OT 



