California Soil Series Directory

Browse K-factor erodibility data, texture classifications, and drainage characteristics for common California soil series used in RUSLE erosion calculations.

K-factor values are sourced from the USDA Natural Resources Conservation Service (NRCS) SSURGO database and reflect published soil erodibility data for California.

About the K-Factor and Soil Erodibility

The K-factor (soil erodibility factor) is a key input in the Revised Universal Soil Loss Equation (RUSLE). It quantifies how susceptible a soil is to erosion by rainfall and runoff, on a scale from 0 (very resistant) to 0.65 (highly erodible). Sandy soils with low organic matter typically have higher K-factors; clay-rich or stony soils tend to be more resistant.

California's Construction General Permit (CGP) requires the K-factor in Risk Level Calculations for construction stormwater compliance. Each soil series in this directory includes the published NRCS K-factor to support accurate RUSLE inputs for your site.

Showing 64 of 64 soil series

Aiken

Texture: clay loam

Drainage: well drained

Altamont

Texture: clay loam

Drainage: well drained

Amador

Texture: sandy loam

Drainage: well drained

Anaverde

Texture: sandy loam

Drainage: well drained

Arbuckle

Texture: loam

Drainage: well drained

Bale

Texture: loam

Drainage: well drained

Barnabe

Texture: loam

Drainage: well drained

Bayshore

Texture: silty clay

Drainage: very poorly drained

Bonnydoon

Texture: sandy loam

Drainage: somewhat excessively drained

Capay

Texture: silty clay

Drainage: moderately well drained

Cieneba

Texture: coarse sandy loam

Drainage: somewhat excessively drained

Clear Lake

Texture: clay

Drainage: poorly drained

Coachella

Texture: fine sandy loam

Drainage: well drained

Corning

Texture: gravelly loam

Drainage: well drained

Cropley

Texture: clay

Drainage: moderately well drained

Delhi

Texture: loamy sand

Drainage: somewhat excessively drained

Diablo

Texture: clay

Drainage: well drained

Elder

Texture: sandy loam

Drainage: well drained

Exeter

Texture: sandy loam

Drainage: moderately well drained

Garretson

Texture: loam

Drainage: well drained

Gillender

Texture: sandy loam

Drainage: well drained

Gilman

Texture: fine sandy loam

Drainage: well drained

Hanford

Texture: sandy loam

Drainage: well drained

Hesperia

Texture: sandy loam

Drainage: well drained

Huerhuero

Texture: clay loam

Drainage: moderately well drained

San Luis Obispo

Indio

Texture: very fine sandy loam

Drainage: well drained

Josephine

Texture: loam

Drainage: well drained

Kimball

Texture: loam

Drainage: moderately well drained

Lassen

Texture: sandy clay loam

Drainage: moderately well drained

Leighcan

Texture: gravelly sandy loam

Drainage: well drained

Linne

Texture: clay loam

Drainage: well drained

San Luis Obispo

Los Osos

Texture: clay loam

Drainage: well drained

San Luis Obispo

Madera

Texture: sandy loam

Drainage: moderately well drained

Mazourka

Texture: sandy loam

Drainage: well drained

Meadowbrook

Texture: fine sandy loam

Drainage: moderately well drained

Millsholm

Texture: loam

Drainage: well drained

Myford

Texture: loam

Drainage: well drained

Niland

Texture: loamy sand

Drainage: somewhat excessively drained

Oxalis

Texture: silty clay loam

Drainage: well drained

Panoche

Texture: clay loam

Drainage: well drained

Pit

Texture: clay loam

Drainage: poorly drained

Pleasanton

Texture: loam

Drainage: well drained

Porterville

Texture: clay

Drainage: moderately well drained

Ramona

Texture: sandy loam

Drainage: well drained

Rincon

Texture: clay loam

Drainage: moderately well drained

Sacramento

Texture: clay

Drainage: poorly drained

San Joaquin

Texture: loam

Drainage: moderately well drained

Sheetiron

Texture: loam

Drainage: somewhat excessively drained

Sierraville

Texture: loam

Drainage: somewhat poorly drained

Supan

Texture: loam

Drainage: well drained

Tocaloma

Texture: clay loam

Drainage: well drained

Trigo

Texture: loam

Drainage: well drained

Trojan

Texture: gravelly loam

Drainage: well drained

Tujunga

Texture: loamy coarse sand

Drainage: excessively drained

Visalia

Texture: sandy loam

Drainage: well drained

Wheatland

Texture: loam

Drainage: well drained

Windy

Texture: silty clay loam

Drainage: poorly drained

Winfield

Texture: sandy loam

Drainage: well drained

Winnedumah

Texture: loamy sand

Drainage: somewhat excessively drained

Wyman

Texture: fine sandy loam

Drainage: well drained

Yokohl

Texture: clay loam

Drainage: well drained

Yolo

Texture: silt loam

Drainage: well drained

Yucaipa

Texture: sandy loam

Drainage: well drained

Zamora

Texture: silty clay loam

Drainage: well drained