Table 2.-- Annual stream flow during July through February from 

 Halfway and Miller Creeks after trenching 



Year ' 



Halfway Creek 

 Y 



Miller Creek 



Ha 1 f w ay 

 ' Predicted : Difference 

 : (Y) : (Y-Y) 





Inahes 



Inahes 



- - - Inches - - - - 



1965-66 



6.39 



6.29 



6.59 -.20 



1966-67 



5.31 



4.43 



5.78 -.47 



1967-68 



6.35 



6.86 



6.83 -.48 



As already noted, precipitation during the low flow period has little influence on 

 streamflow. Correlations between Halfway Creek streamflow and Rice Climatic Station 

 precipitation, as well as between Miller Creek streamflow and Rice Climatic Station 

 precipitation, verified this lack of relationship. Since the trenches have been com- 

 pleted, summer precipitation amounts have varied from near-record lows to extreme highs, 

 yet streamflow yields do not reflect such extremes. 



Spring Streamflow Period 



Spring streamflow (March through June) is extremely variable and represents the 

 net effect of many variables (Croft 1944). Total streamflow from Halfway during this 

 period has ranged from a low of 4.78 inches to a high of 19.61 inches in 1964 just be- 

 fore trenching. The extremely variable streamflow from the Halfway Creek drainage is 

 matched by that from the Miller Creek drainage. When streamflows from the two were com- 

 pared, 88 percent of the variation in Halfway Creek was explained by Miller Creek 

 streamflow (fig. 11). The lack of change in streamflow after trenching was confirmed 

 by a covariance analysis that compared before and after trenching results. This analysis 

 showed no significant change in either the slope nor the position of the regression line. 



Figure 11. — The relationship 

 between the snowmelt period 

 streamflow from the Half- 

 way Creek drainage and that 

 from the Miller Creek 

 drainage, 1952-1968. 



MILLER CREEK STREAMFLOW (Inches) 



12 



