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June 16, 2022 <br />93 <br /> <br /> Group A: soils having a low runoff potential due to high infiltration rates. These soils consist primarily of deep, well-drained sands and gravels. <br />Group B: soils having moderately low runoff potential due to moderate infiltration rates. These soils consist <br />primarily of moderately deep to deep, moderately well to well-drained soils with moderately course textures. <br />Group C: soils having a high runoff potential due to very slow infiltration rates. These soils consist primarily of <br />soils in which a layer exists near the surface that impedes the downward movement of water or soils with moderately fine to find texture. <br />Group D: soils having a low runoff potential due to high infiltration rates. These soils consist primarily of clays <br />with high swelling potential, soils with permanently high water tables, soils with a claypan or clay layer at or <br />near the surface and shallow soils over nearly impervious parent material. <br />Dual hydrologic groups: A/D, B/D, C/D, are given for certain wet soils that can be adequately drained. The first <br />letter applies to the drained condition, the second to the undrained. Only soils that are rated D in their natural <br />condition are assigned to dual classes. Soils may be assigned to dual groups if drainage is feasible and practical. <br />N/A: soils not classified <br /> <br />