Tocaloma Soil Series
K-Factor
0.37
Soil Erodibility Factor
Texture Class
clay loam
Drainage Class
well drained
About Tocaloma
Moderately deep, well drained soils formed in colluvium and residuum derived from sedimentary rocks, principally sandstone and mudstone. Found on hills and mountain slopes with slopes of 15 to 50 percent.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Tocaloma 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 Marin and Sonoma counties in the outer Coast Ranges. Occurs commonly on the hills north of San Francisco Bay, supporting grassland and oak woodland. Named for Tocaloma in the San Geronimo Valley.
Counties Where Found
Tocaloma soil FAQ
What is the K factor for Tocaloma soil?
Tocaloma 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 Tocaloma soil found in California?
Tocaloma is mapped in Marin, Sonoma. County mapping is based on available soil series data and should be verified for the exact project location.
How is Tocaloma used in RUSLE erosion calculations?
Use the Tocaloma 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 Tocaloma soil data
Start a Rapid RUSLE project with this soil's K-factor (0.37) pre-loaded. Get accurate RUSLE erosion risk assessments in minutes.
Start a Rapid RUSLE project with this soilNo login required to preview results.