STUDY AREA AND METHODS 



The study area is within the confines of the Zena Creek logging study area near 

 the head of the Deep Creek drainage, a tributary to the Secesh River. Three contiguous, 

 ephemeral drainages comprise the 10-acre area (fig. 2). Annual precipitation at the 

 study area averages 28.3 inches, of which about 60 percent occurs as snow. 



The dominant tree species are ponderosa pine {Pinus ponderosa Laws.) and Douglas- 

 fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco). The coarse, loamy sand soils 

 are derived from quartz monzonite bedrock and are poorly developed, exhibiting only A 

 and C horizons. Additional descriptive data are summarized in table 1. 



Figure 2. — Schematic 

 map of the 

 study watersheds. 



SCALE IN FEET 



200 400 DRAINAGE 



DIVIDE 



LEGEND 



O 



<cz> 



Sediment dam drainage divide 



Sediment dam with watershed number 



Recording rain gage 



Storage rain gage 



Logs and debris 



Old debris avalanche 



Sediment flow path (as of 5/8/62) 



3 



