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Custom Soil Resource Report <br /> Group C. Soils having a slow infiltration rate when thoroughly wet. These consist <br /> chiefly of soils having a layer that impedes the downward movement of water or <br /> soils of moderately fine texture or fine texture. These soils have a slow rate of water <br /> transmission. <br /> Group D. Soils having a very slow infiltration rate (high runoff potential)when <br /> thoroughly wet. These consist chiefly of clays that have a high shrink-swell <br /> potential, soils that have a high water table, soils that have a claypan or clay layer at <br /> or near the surface, and soils that are shallow over nearly impervious material. <br /> These soils have a very slow rate of water transmission. <br /> If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is <br /> for drained areas and the second is for undrained areas. Only the soils that in their <br /> natural condition are in group D are assigned to dual classes. <br /> 19 <br />