Yolo Soil Series
USDA Code: CA0745
K-Factor
0.32
Soil Erodibility Factor
Texture Class
silt loam
Drainage Class
well drained
About Yolo
Deep, well drained soils formed in alluvium from mixed rock sources. Found on nearly level to gently sloping alluvial fans and flood plains.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Yolo 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
Widespread in the Sacramento and San Joaquin valleys. One of the most productive agricultural soils in California.
Counties Where Found
Yolo soil FAQ
What is the K factor for Yolo soil?
Yolo has a listed K factor of 0.32 in the Rapid RUSLE soil directory. Confirm final values against project specific soil survey data before submitting permit documents.
Where is Yolo soil found in California?
Yolo is mapped in Sacramento, Solano, Yolo. County mapping is based on available soil series data and should be verified for the exact project location.
How is Yolo used in RUSLE erosion calculations?
Use the Yolo 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 Yolo soil data
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