APPENDiX 



Great Basin Exverinerital .4i'5a. - -Es timated sheet erosion on GBEA as a function of 

 bulk density (surface 4 inches of soil) and total cover percentage (plants, litter,- and 

 stone) is listed in table 3. For example, if a site has 60 percent cover and bulk den- 

 sity is 1.05 g./cc, the estimate is 2.16 pounds per milacre, without slope correction. 

 If the slope gradient of this site is 10 percent, the correction factor is 0.66 (from 

 table 1). Estimated erosion, corrected for slope, is 2.16 X 0.66 =1.4 pounds per 

 mi iacre . 



Davis County Experimental Watershed. --The nomogram (fig. 16) for DCEW is used as 

 fol lows : 



1. Start at plant and litter cover percentage on line A and draw a line to litter 

 weight (lbs . /milacre) on line B. 



2. Draw a line from the intersection point on line C to slope percentage on line D. 



3. Draw a line from the intersection point on line E to organic matter percent on 

 line F. 



4. The intersection on line G is estimated erosion in pounds per milacre. 



For example, if a site has 80 percent cover of plants and litter, 4 pounds of 

 litter per milacre, 36 percent slope, and 8.1 percent organic matter in the surface 

 2 inches of soil, its estimated sheet erosion is 0.30 pound per milacre according to 

 figure 16. 



Table 3 .--Sheet erosion on GBEA as affected by total cover (plants, 



litter, and stone) and soil bulk density (surface 4 inches) 



^^^^ ■ Bulk density (g./cc.) 



(°o) \ 0.90 : 0.95 : 1.00 : 1.05 : 1.10 : 1.15 : 1.20 : 1.25 : 1.30 



- Pounds per mi lacre - -- -- -- -- -- -- -- 



30 



3 



40 



4 



11 



4 



84 



5 



53 



6 



14 



6 



.62 



6 



93 



7 



05 



6 



96 



35 



3 



05 



3 



72 



4 



42 



4 



98 



5 



69 



6 



20 



6 



53 



6 



71 



6 



68 



40 



2 



65 



3 



27 



3 



91 



4 



54 



5 



12 



5 



62 



5 



98 



6 



18 



6 



21 



45 



2 



25 



2 



79 



3 



36 



3 



95 



4 



48 



4 



96 



5 



32 



5 



54 



5 



62 



50 



1 



85 



2 



31 



2 



81 



3 



32 



3 



81 



4 



25 



4 



60 



4 



83 



4 



93 



55 



1 



48 



1 



87 



2 



28 



2 



72 



3 



15 



3 



56 



3 



86 



4 



09 



4 



21 



60 



1 



14 



1 



46 



1 



80 



2 



16 



2 



52 



2 



86 



3 



15 



3 



36 



3 



49 



65 





86 



1 



12 



1 



38 



1 



68 



1 



97 



T 



25 





50 



2 



70 



2 



81 



70 





65 





82 



1 



02 



1 



16 



1 



49 



1 



72 



1 



92 



2 



09 



2 



20 



75 





45 





59 





74 





92 



1 



10 



1 



28 



1 



44 



1 



57 



1 



68 



80 





31 





41 





52 





65 





78 





92 



1 



05 



1 



15 



1 



24 



85 





21 





28 





36 





44 





55 





65 





75 





82 





89 



90 





14 





18 





24 





50 





37 





44 





51 





57 





62 



95 





09 





12 





15 





20 





24 





29 





54 





39 





43 



100 





05 





07 





10 





12 





15 





19 





2 2 





25 





28 



20 



