|
Group
|
Meaning |
Saturated Conductivity |
|
|
(mm/hr) |
(in/hr) |
||
|
A |
Low runoff potential. Includes soils with high infiltration rates even when thoroughly wetted, and which consist chiefly of deep, well to excessively drained sands or gravels. |
Smaller than or equal to 11.43 |
Smaller than or equal to 0.45 |
|
B |
Includes soils with moderate infiltration rates when thoroughly wetted and consisting chiefly of moderately deep to deep, moderately well to well-drained soils with moderately fine to moderately coarse textures e.g. shallow loess, sandy loam. |
7.62 - 3.81 |
0.30 - 0.15 |
|
C |
Includes soils with slow infiltration rates when thoroughly wetted and consisting chiefly of soils with a layer that impedes downward movement of water, or soils with moderately fine to fine textures e.g. clay loams, shallow sandy loam. |
3.81 - 1.27 |
0.15 - 0.05 |
|
D |
High runoff potential. Includes soils with very slow infiltration rates when thoroughly wetted and consisting chiefly of clay soils with a high swelling potential, soils with a permanent high water table, soils with a clay-pan or clay layer at or near the surface, and shallow soils over nearly impervious material. |
1.27 - 0.00 |
0.05 - 0.00 |