Winnedumah Soil Series
K-Factor
0.17
Soil Erodibility Factor
Texture Class
loamy sand
Drainage Class
somewhat excessively drained
About Winnedumah
Deep, somewhat excessively drained soils formed in alluvium and eolian deposits derived from granitic and mixed rock sources in a thermic/aridic environment. Very low organic matter; often saline-sodic in lower horizons. Found on alluvial plains and desert flats.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Winnedumah 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
Occurs in the arid eastern basins of Inyo and Mono counties, particularly around Owens Lake and similar playas. Extremely prone to wind erosion (dust storms); the dry Owens Lake bed is one of the largest sources of PM10 dust in the United States.
Counties Where Found
Winnedumah soil FAQ
What is the K factor for Winnedumah soil?
Winnedumah has a listed K factor of 0.17 in the Rapid RUSLE soil directory. Confirm final values against project specific soil survey data before submitting permit documents.
Where is Winnedumah soil found in California?
Winnedumah 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 Winnedumah used in RUSLE erosion calculations?
Use the Winnedumah 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 Winnedumah soil data
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