Ramona Soil Series
USDA Code: CA0607
K-Factor
0.28
Soil Erodibility Factor
Texture Class
sandy loam
Drainage Class
well drained
About Ramona
Deep, well drained soils formed in alluvium derived from granitic and related crystalline rock sources. Profile features a reddish argillic subsoil horizon. Found on alluvial fans and terraces in the inland valleys and foothills.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Ramona 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
Widespread in San Diego, Riverside, and Orange counties. Named for the town of Ramona. Historically California's premier avocado soil; now extensively developed for residential uses in the Inland Empire.
Counties Where Found
Ramona soil FAQ
What is the K factor for Ramona soil?
Ramona has a listed K factor of 0.28 in the Rapid RUSLE soil directory. Confirm final values against project specific soil survey data before submitting permit documents.
Where is Ramona soil found in California?
Ramona is mapped in Orange, Riverside, San Diego. County mapping is based on available soil series data and should be verified for the exact project location.
How is Ramona used in RUSLE erosion calculations?
Use the Ramona 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 Ramona soil data
Start a Rapid RUSLE project with this soil's K-factor (0.28) pre-loaded. Get accurate RUSLE erosion risk assessments in minutes.
Start a Rapid RUSLE project with this soilNo login required to preview results.