Yucaipa Soil Series
K-Factor
0.28
Soil Erodibility Factor
Texture Class
sandy loam
Drainage Class
well drained
About Yucaipa
Moderately deep, well drained soils formed in alluvium and colluvium derived from granitic rocks. Profile features a subsoil clay increase. Found on alluvial fans and foothill slopes at the base of the San Bernardino Mountains, slopes of 5 to 30 percent.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Yucaipa 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 the city of Yucaipa. Mapped in San Bernardino and Riverside counties on the alluvial fan systems draining the San Bernardino Mountains. Important for residential development planning in the foothill zone.
Counties Where Found
Yucaipa soil FAQ
What is the K factor for Yucaipa soil?
Yucaipa 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 Yucaipa soil found in California?
Yucaipa is mapped in Riverside, San Bernardino. County mapping is based on available soil series data and should be verified for the exact project location.
How is Yucaipa used in RUSLE erosion calculations?
Use the Yucaipa 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 Yucaipa soil data
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