Capay Soil Series
USDA Code: CA0078
K-Factor
0.28
Soil Erodibility Factor
Texture Class
silty clay
Drainage Class
moderately well drained
About Capay
Deep, moderately well drained soils formed in alluvium from mixed sedimentary rock sources. Found on basin floors and alluvial fans.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Capay 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
Found in Yolo, Solano, and Colusa counties. Heavy texture makes it challenging for construction but excellent for rice cultivation.
Counties Where Found
Capay soil FAQ
What is the K factor for Capay soil?
Capay has a listed K factor of 0.28 in the Rapid RUSLE soil directory. Confirm final values against project specific soil survey data before submitting permit documents.
Where is Capay soil found in California?
Capay is mapped in Colusa, Solano, Yolo. County mapping is based on available soil series data and should be verified for the exact project location.
How is Capay used in RUSLE erosion calculations?
Use the Capay 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 Capay soil data
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