Trigo Soil Series
K-Factor
0.28
Soil Erodibility Factor
Texture Class
loam
Drainage Class
well drained
About Trigo
Deep, well drained soils formed in alluvium derived from mixed sedimentary rock sources transported by the Colorado River. Found on nearly level to gently sloping alluvial plains, slopes of 0 to 2 percent. Calcareous and saline throughout.
K factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
Using Trigo 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
Mapped in the Imperial Valley of Imperial County on the Colorado River alluvial plain. Highly productive irrigated cropland supporting alfalfa, vegetables, and grains. Salinity management is critical due to the Colorado River water source.
Counties Where Found
Trigo soil FAQ
What is the K factor for Trigo soil?
Trigo 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 Trigo soil found in California?
Trigo is mapped in Imperial. County mapping is based on available soil series data and should be verified for the exact project location.
How is Trigo used in RUSLE erosion calculations?
Use the Trigo 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 Trigo soil data
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