Tujunga Soil Series
USDA Code: CA0689
K-Factor
0.17
Soil Erodibility Factor
Texture Class
loamy coarse sand
Drainage Class
excessively drained
About Tujunga
Deep, excessively drained soils formed in coarse alluvium derived from granitic and gneissic rock sources. Found on recent alluvial fans, floodplains, and outwash plains at the base of the San Gabriel Mountains and other ranges, slopes of 0 to 5 percent.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Tujunga 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 of the Los Angeles Basin, San Bernardino, and Orange counties. Named for the community of Tujunga. Important for groundwater recharge and is the substrate for many spreading grounds and percolation basins.
Counties Where Found
Tujunga soil FAQ
What is the K factor for Tujunga soil?
Tujunga 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 Tujunga soil found in California?
Tujunga is mapped in Los Angeles, Orange, Riverside, and other California counties. County mapping is based on available soil series data and should be verified for the exact project location.
How is Tujunga used in RUSLE erosion calculations?
Use the Tujunga 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 Tujunga soil data
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