Hanford Soil Series
USDA Code: CA0289
K-Factor
0.28
Soil Erodibility Factor
Texture Class
sandy loam
Drainage Class
well drained
About Hanford
Deep, well drained soils formed in alluvium derived from granitic rock sources. Found on alluvial fans and flood plains from the east side of the San Joaquin Valley. Slopes of 0 to 5 percent. Moderately permeable throughout.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Hanford 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
One of the most extensively mapped soils in California, covering large areas of Kings, Tulare, and Kern counties. Highly productive for cotton, grapes, and citrus. Named for the city of Hanford in Kings County.
Counties Where Found
Hanford soil FAQ
What is the K factor for Hanford soil?
Hanford 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 Hanford soil found in California?
Hanford is mapped in Fresno, Kern, Kings, and other California counties. County mapping is based on available soil series data and should be verified for the exact project location.
How is Hanford used in RUSLE erosion calculations?
Use the Hanford 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 Hanford soil data
Start a Rapid RUSLE project with this soil's K-factor (0.28) pre-loaded. Get accurate RUSLE erosion risk assessments in minutes.
Start a Rapid RUSLE project with this soilNo login required to preview results.