Hesperia Soil Series
USDA Code: CA0323
K-Factor
0.24
Soil Erodibility Factor
Texture Class
sandy loam
Drainage Class
well drained
About Hesperia
Deep, well drained soils formed in alluvium derived from granitic and gneissic rock sources. Found on alluvial fans and valley floors in the arid transverse and peninsular ranges, slopes of 0 to 8 percent.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Hesperia 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 San Bernardino, Kern, and Los Angeles counties. Common in the Mojave Desert transition zone and the high desert valleys. Important for dryland farming and urban development areas in the Inland Empire.
Counties Where Found
Hesperia soil FAQ
What is the K factor for Hesperia soil?
Hesperia 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 Hesperia soil found in California?
Hesperia is mapped in Kern, Los Angeles, San Bernardino. County mapping is based on available soil series data and should be verified for the exact project location.
How is Hesperia used in RUSLE erosion calculations?
Use the Hesperia 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 Hesperia soil data
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