Clear Lake Soil Series
USDA Code: CA0095
K-Factor
0.24
Soil Erodibility Factor
Texture Class
clay
Drainage Class
poorly drained
About Clear Lake
Deep, poorly drained soils formed in alluvium from basic igneous and sedimentary rocks. Found in basins and on alluvial flats.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Clear Lake 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
Named for Clear Lake in Lake County. Also found in parts of Napa and Sonoma counties in low-lying areas.
Counties Where Found
Clear Lake soil FAQ
What is the K factor for Clear Lake soil?
Clear Lake 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 Clear Lake soil found in California?
Clear Lake is mapped in Lake, Napa, Sonoma. County mapping is based on available soil series data and should be verified for the exact project location.
How is Clear Lake used in RUSLE erosion calculations?
Use the Clear Lake 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 Clear Lake soil data
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