Wyman Soil Series
K-Factor
0.28
Soil Erodibility Factor
Texture Class
fine sandy loam
Drainage Class
well drained
About Wyman
Deep, well drained soils formed in alluvium derived from mixed granitic, volcanic, and metamorphic rock sources. Found on alluvial fans and valley floors at the base of the Sierra Nevada and White-Inyo Mountains, slopes of 0 to 5 percent.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Wyman 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
Characteristic of the Owens Valley alluvial fan system in Inyo County, also present in Mono County. Historically irrigated for alfalfa and pasture; water rights transfers to LADWP dramatically reduced agricultural use.
Counties Where Found
Wyman soil FAQ
What is the K factor for Wyman soil?
Wyman 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 Wyman soil found in California?
Wyman is mapped in Inyo, Mono. County mapping is based on available soil series data and should be verified for the exact project location.
How is Wyman used in RUSLE erosion calculations?
Use the Wyman 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 Wyman soil data
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