Kimball Soil Series
USDA Code: CA0378
K-Factor
0.37
Soil Erodibility Factor
Texture Class
loam
Drainage Class
moderately well drained
About Kimball
Moderately deep, moderately well drained soils formed in alluvium from mixed rock sources with a clay subsoil. Found on low terraces.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Kimball 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 Sacramento, Placer, and El Dorado counties. Common in suburban development areas east of Sacramento.
Counties Where Found
Kimball soil FAQ
What is the K factor for Kimball soil?
Kimball 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 Kimball soil found in California?
Kimball is mapped in El Dorado, Placer, Sacramento. County mapping is based on available soil series data and should be verified for the exact project location.
How is Kimball used in RUSLE erosion calculations?
Use the Kimball 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 Kimball soil data
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