Measurement of Data Related to Evapotranspiratlon 



Correlative pan and atmometer evaporation measurements 

 were made at agroclimatic stations established near the evapotran- 

 spiratlon measuring stations. These stations are listed in Table ^ 

 of Appendix A, Detailed information regarding the agroclimatic sta 

 tions, and pan and atmometer data, are given in Tables A-1, A-2, and 

 A-3 of that appendix. 



At Arvin (in Kern County) the pan and atmometer data were 

 initially collected at stations (Arvin Jewett #1 and #2) located 

 in an irrigated alfalfa field near the evapotranspiratlon station, 

 or soil moisture depletion plots. In June 1959^ a new station 

 (Arvin-Frick) was established in an irrigated grass environment. 

 All of the soil moisture depletion plots were within 1 mile of 

 this station. 



Only atmometer data were collected at the Pittville AA 

 plot site (in eastern Shasta County) during 1959. This agroclimat 

 station is identified as Pittville 1 S. Pan data were collected 

 within an irrigated pasture site, designated as Fall River Mills 

 4 Nw, during 1959:» and until June I960, but due to unfavorable 

 operational procedures at this site in 1959^ the pan data were 

 not used in this report. 



In June I960, an agroclimatic station vms established 



at a location within an irrigated pasture 8 miles west of the 



Pittville AA plot. This station is identified as Glenburn DWR. 



Comparison of atmometer evaporation measurements at the Pittville 



1 S and the Glenburn DWR stations showed that the difference in 



evaporation between the black and white atmometers is very close 



for these two locations. 



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