LETTER OF TRANSMITTAL 



Mr. Edward Hyatt 

 State Engineer 

 Sacramento, California 



Dear Mr. Hyatt : 



I am transmitting to you for publication by the State a report 

 jirepared by Harold V. Troxell, entitled "Ground water supply and 

 natural losses in the valley of the Santa Ana River between Riverside 

 Narrows and the Orange County line." The report presents the results 

 of an intensive study to determine the quantity of ground water that 

 percolates into this stretch of the valley and is discharged either as 

 surface flow or by evaporation or transpiration of the vegetation in the 

 valley. The report is believed to be of value both because of the use 

 tliat can be made of the data and conclusions which it contains in the 

 further development of the water supply of the drainage basin of the 

 Santa Ana River and because of the contribution which it makes to 

 (liiantitative methods in ground water hydrology. 



Very truly yours, 



Washington, D. C, July 31, 1933. 



Chief Hydraulic Engineer 

 Water Resources Branch, 

 U. S. Geological Survey. 



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