Figure 13. -Soil 

 erosion on the 

 Coolwater Ridge 

 study area in 

 relation to 

 percent of soil 

 surface protected 

 from direct rain- 

 drop impact. 



Figure 1 4 . — Es timated 

 versus actual soil 

 erosion on the 

 Trinity Mountains 

 study area. 







10 



20 30 40 50 60 70 80 



90 100 



10 





PLANT. LITTER, AND STONE COVER (%) 











5 





° 

 o o / 





2 





° %/ ° 



/o oo 

 „ °/o „ ° 



o 







o 



1 









°° o / o 



/ o 

 / o 







o 



0.5 





y o 



o / 



° o / o 



/ 





0.2 





/ 





0.1 



o 



/ O 





0.05 









0.02 









0.01 



1 



III III 



1 



0.01 0.02 



0.05 0.1 0.2 0.5 1 2 



5 10 



ACTUAL SOIL EROSION (Pounds per milacre) 



15 



