Porterville Soil Series
USDA Code: CA0573
K-Factor
0.37
Soil Erodibility Factor
Texture Class
clay
Drainage Class
moderately well drained
About Porterville
Deep, moderately well drained soils formed in alluvium derived from mixed sedimentary and metamorphic rocks. High smectite clay content (>40%) with strong vertic properties. Found on alluvial fans and plains at the foot of the Sierra Nevada and Tehachapi Mountains.
K-factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database.
California Distribution
Mapped extensively in Tulare, Kern, and Kings counties. Named for the city of Porterville. Heavy clay causes severe shrink-swell; challenging for construction but valuable for agriculture where drainage is managed.
Counties Where Found
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