110 



DIVISION OF WATER RESOURCES 



In the preceding paragraphs the effect of the various factors 

 affecting the measurement of the evaporation and transpiration from 

 the canyon bottom on tlie section between the lower control and the 

 middle and branch controls has been discussed. The same factors and 

 conditions have a similar etfect on the section between the middle con- 

 trol and the upper control. 



An examination of Table 36 shows that the daily maximum dis- 

 charge at the middle control never exceeded the daily maxinnim dis- 

 charge at the upper control, except on October 10, when it was due to 

 rain causing surface run-off between the controls. Hence there is no 

 inflow unless there is also deep percolation. Deep percolation is elim- 

 inated as a po.ssibility, except for the remote chance that the intiov.' 

 and outflow would balance, by the occurrence of equal daily maximum 

 discharges at the two controls on the cloudy morning of October 9. 



The daily losses between the middle and branch controls and ^he 

 lower control are given for 1931 in Table 37 and for 1932 in Table 38 

 and between the upper control and middle control for the 1932 season 

 in Table 39. 



TABLE 37 



DAILY LOSS OF WATER FROM THE STREAM BETWEEN MIDDLE AND LOWER 

 CONTROLS IN COLDWATER CANYON 



August 1, to October 17. 1931 



•Portion of day only. 



