ABSTRACT 



Distribution and volume of streamflow from Halfway and 

 Miller Creeks, two drainages on the Davis County Experi- 

 mental Watershed, were evaluated. In 1964, about 15 percent 

 of the Halfway Creek drainage was contour trenched. Twelve 

 years of streamflow records before trenchir^ and 4 years of 

 records after trenching were analyzed. 



Peak spring flow and peak summer storm flow were 

 reduced after trenching. However, neither annual water 

 yields nor snowmelt runoff in spring and early summer were 

 significantly altered in either volume or distribution over time 

 as a result of trenching. This conclusion is substantiated by 

 supplemental data of precipitation, soil moisture, snowpack 

 water equivalent, and vegetation. 



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