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• Table 8.8 Selected USLE C Values for Construction, Mining, <br />and Forest Lands. <br />Condition C factor References Condition C factor References <br />• <br />Devised May 2010 (PR06) Attachment 2.05.3(3) -6 -5 <br />1. Ban sail conditions <br />5. Undisturbed forest <br />Undisturbed except scraped <br />0.66 -1.30 <br />° <br />100 -75% canopy, 100 -90% litter <br />0.0001 -0.001 <br />C <br />Compacted <br />35-20% canopy, 70-40% titter <br />0.003 -0.009 <br />C <br />Smooth <br />1.00 -1.40 <br />° A <br />6. Permanent pasture and brush cover <br />Root raked <br />0.90 -1.20 <br />0% canopy, 80% ground cover <br />Disk tillage <br />Grass <br />0.013 <br />C <br />Fresh <br />1.00 <br />° <br />Weeds <br />0.043 <br />r <br />After one rain <br />039 <br />° <br />50% Bnrsh, 80% ground cover <br />2. Mulch <br />Grass <br />0.012 <br />C <br />Straw <br />7. Mechanically prepared woodland sites <br />0.5 tons/ac <br />0.30 <br />ad <br />Burned, 10% cover at ground <br />1.0 tons/ac <br />0.18 <br />ad <br />Good soil <br />0.240 <br />C <br />2.0 tons/ac <br />0.09 <br />°d <br />Poor soil <br />0,360 <br />t <br />4.0 tons/sc <br />0.02 <br />ad <br />Burned, 0% cover at ground <br />Wood chips <br />Good soil <br />0.260 <br />° <br />OS tons/ac <br />0.90 <br />ad <br />Poor soil <br />0.450 <br />C <br />2.0 totWac <br />0.70 <br />ad <br />Risked, 0% cover at ground <br />4.0 tons/se <br />0.42 <br />°d <br />Good soil <br />0.720 <br />C <br />6.0 tars/sc <br />0.22 <br />ad <br />Poor soil <br />0.940 <br />3. Chemical binders <br />Asphalt emulsion, 605 gal/ac <br />0.14-0.52 <br />° <br />• <br />Aquatan, Terra -tack <br />0.67 <br />° <br />4. Seedings <br />No prepared seedbed <br />New planting <br />a64 <br />° <br />After 60 days <br />0.54 <br />° <br />Prepared seedbed <br />New planting <br />0.40 <br />° <br />After 60 days <br />0.05 <br />° <br />Note. Additional values are given in Appendix 8B. <br />°Transportation Research Board (1980). <br />b Barfreld et at. (1988). <br />`Wischmeier and Smith (1978). <br />¢ Meyer et a1. (1972). C factors for mukb <br />vary depending <br />on slope length and steepness. Slope length limits apply (sae Appendix 8B, Table 8B.5). <br />• <br />Devised May 2010 (PR06) Attachment 2.05.3(3) -6 -5 <br />