THE AUTHOR 



R. D. DOTY, Associate Research Forester, has been employed by 

 the Intermountain Station since 1964. He holds a B. S. degree 

 in Forestry from the University of Idaho and an M. S. degree 

 in Watershed Management from Utah State University. 



ACKNOWLEDGMENT 



We of the Intermountain Forest and Range Experiment Station 

 acknowledge with appreciation the valuable assistance of per- 

 sonnel of the Wasatch National Forest and the Intermountain 

 Region headquarters in facilitating the design and supervision 

 of the contour trench construction. This assistance substan- 

 tially expedited the conduct of this study. 



i i 



