Texture class | Texture | Permeability rate | Permeability class |
Coarse | Gravel, coarse sand Sand, loamy sand | > 20 inches/h 6.20 inches/h | Very rapid Rapid |
Moderately coarse | Coarse sandy loam, sandy loam, fine sandy loam | 2 - 6 inches/h | Moderately rapid |
Medium | Very fine sandy loam, loam, silt loam, silt | 0.60 - 2 inches/h | Moderate |
Moderately fine | Clay loam, sandy clay loam, silty clay loam | 0.20 - 0.60 inches/h | Moderately slow |
Fine | Sandy clay, silty clay, clay (<60%) | 0.06 - 0.20 inches/h | Slow |
Very fine | Clay (>60%), clay pan | <0.06 inches/h | Very slow |