Visalia Soil Series
USDA Code: CA0712
K-Factor
0.32
Soil Erodibility Factor
Texture Class
sandy loam
Drainage Class
well drained
About Visalia
Deep, well drained soils formed in alluvium derived from granitic rock sources. Found on low alluvial fans and terraces at the margin of the San Joaquin Valley with slopes of 0 to 2 percent. Moderately fine subsoil.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Visalia 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
Mapped in Tulare, Kings, Kern, and Fresno counties, named for the city of Visalia. One of the most productive fruit and grape soils in the southern San Joaquin Valley.
Counties Where Found
Visalia soil FAQ
What is the K factor for Visalia soil?
Visalia 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 Visalia soil found in California?
Visalia is mapped in Fresno, Kern, Kings, and other California counties. County mapping is based on available soil series data and should be verified for the exact project location.
How is Visalia used in RUSLE erosion calculations?
Use the Visalia 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 Visalia soil data
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