Zamora Soil Series
USDA Code: CA0749
K-Factor
0.37
Soil Erodibility Factor
Texture Class
silty clay loam
Drainage Class
well drained
About Zamora
Deep, well drained soils formed in alluvium from mixed sedimentary rock sources. Found on nearly level alluvial fans and flood plains.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Zamora 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 and Solano counties. Highly productive agricultural soil but moderately erodible due to silt content.
Counties Where Found
Zamora soil FAQ
What is the K factor for Zamora soil?
Zamora has a listed K factor of 0.37 in the Rapid RUSLE soil directory. Confirm final values against project specific soil survey data before submitting permit documents.
Where is Zamora soil found in California?
Zamora is mapped in Solano, Yolo. County mapping is based on available soil series data and should be verified for the exact project location.
How is Zamora used in RUSLE erosion calculations?
Use the Zamora 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 Zamora soil data
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