Elder Soil Series
USDA Code: CA0166
K-Factor
0.24
Soil Erodibility Factor
Texture Class
sandy loam
Drainage Class
well drained
About Elder
Deep, well drained soils formed in alluvium from mixed sedimentary rock sources. Found on alluvial fans and flood plains along major streams.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Elder 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 Mendocino and Humboldt counties along coastal stream terraces. Important for timber and agricultural uses.
Counties Where Found
Elder soil FAQ
What is the K factor for Elder soil?
Elder has a listed K factor of 0.24 in the Rapid RUSLE soil directory. Confirm final values against project specific soil survey data before submitting permit documents.
Where is Elder soil found in California?
Elder is mapped in Humboldt, Mendocino. County mapping is based on available soil series data and should be verified for the exact project location.
How is Elder used in RUSLE erosion calculations?
Use the Elder 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 Elder soil data
Start a Rapid RUSLE project with this soil's K-factor (0.24) pre-loaded. Get accurate RUSLE erosion risk assessments in minutes.
Start a Rapid RUSLE project with this soilNo login required to preview results.