Winfield Soil Series
K-Factor
0.24
Soil Erodibility Factor
Texture Class
sandy loam
Drainage Class
well drained
About Winfield
Moderately deep, well drained soils formed in material weathered from tuff, andesite, and basalt with significant volcanic ash influence in the upper profile. Found on lava plateaus and volcanic uplands at 4,000–6,000 ft elevation.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Winfield in a RUSLE calculation
For a California construction project, use the soil K factor with rainfall erosivity, slope length and steepness, cover management, and support practice inputs. The K factor represents the soil erodibility portion of the model, so selecting the soil series that matches the site is important for defensible stormwater documentation.
In a SWPPP workflow, the practical question is not just what soil type is mapped near the project. It is whether the mapped series, K factor, and drainage assumptions match the site evidence well enough to support the RUSLE or RUSLE2 calculation.
California Distribution
Extensive on the Modoc Plateau and Cascade Range volcanic terrane in Modoc and Lassen counties. Supports ponderosa pine and juniper woodland; used for range and timber production.
Counties Where Found
Winfield soil FAQ
What is the K factor for Winfield soil?
Winfield has a listed K factor of 0.24 in the Rapid RUSLE soil directory. Confirm final values against project specific soil survey data before submitting permit documents.
Where is Winfield soil found in California?
Winfield is mapped in Lassen, Modoc, Siskiyou. County mapping is based on available soil series data and should be verified for the exact project location.
How is Winfield used in RUSLE erosion calculations?
Use the Winfield K factor as the soil erodibility input in RUSLE or RUSLE2, along with rainfall, slope, cover, and support practice factors for the site.
Calculate erosion risk with Winfield soil data
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