Bare soil cover types and percent reduction of soil loss. The C factor, used to determine the relative effectiveness of soil and crop management systems in terms of preventing soil loss, is a ratio comparing the soil loss from land under a specific crop and management system to the corresponding loss from continuously fallow and tilled land. Source: Northwest California Resource Conservation and Development District 2016.
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Vegetative Cover C factor Percent reduction of soil loss
None (fallow ground) 1.0 0
Native vegetation (undisturbed) 0.01 99
Temporary tyegrass, 99% (perennial) 0.05 95
Temporary ryegrass, 90% (annuals) 0.1 90
Permanent seedings (90%) 0.01 99
Sod (laid immediately) 0.01 99
Mulching (for slopes 2:1 or less)
Hay (0.5 tons/acre) 0.25 75
Hay (1.0 tons/acre) 0.13 87
Hay (1.5 tons/acre) 0.07 93
Hay (2.0 tons/acre) 0.02 98
Wood chips (6 tons/acre) 0.06 94
Wood cellulose (1.75 tons per acre)X 0.10 90
Other
Competent gravel layer 0.05 95
Rolled erosion control fabrics (for slope greater than 2:1) Variable C value by type

This page was last modified on 7 November 2016, at 13:59.

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