Madera Soil Series
USDA Code: CA0430
K-Factor
0.32
Soil Erodibility Factor
Texture Class
sandy loam
Drainage Class
moderately well drained
About Madera
Moderately deep, moderately well drained soils with a duripan, formed in alluvium from granitic rock sources. Found on terraces and fan remnants.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Madera 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
Found in Madera and Fresno counties. The hardpan layer typically occurs at 20-40 inches and limits infiltration.
Counties Where Found
Madera soil FAQ
What is the K factor for Madera soil?
Madera has a listed K factor of 0.32 in the Rapid RUSLE soil directory. Confirm final values against project specific soil survey data before submitting permit documents.
Where is Madera soil found in California?
Madera is mapped in Fresno, Madera. County mapping is based on available soil series data and should be verified for the exact project location.
How is Madera used in RUSLE erosion calculations?
Use the Madera 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 Madera soil data
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