Barnabe Soil Series
K-Factor
0.32
Soil Erodibility Factor
Texture Class
loam
Drainage Class
well drained
About Barnabe
Shallow, well drained soils formed in residuum derived from sandstone and shale. Lithic contact typically within 20 inches. Found on steep mountain slopes and ridges of the Coast Ranges with slopes of 30 to 75 percent.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Barnabe 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
Named for Mount Barnabe in Marin County. Characteristic of the ridges of Point Reyes and the Mount Tamalpais area. Supports chaparral and coastal scrub vegetation.
Counties Where Found
Barnabe soil FAQ
What is the K factor for Barnabe soil?
Barnabe 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 Barnabe soil found in California?
Barnabe is mapped in Marin, San Mateo. County mapping is based on available soil series data and should be verified for the exact project location.
How is Barnabe used in RUSLE erosion calculations?
Use the Barnabe 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 Barnabe soil data
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