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Hydrologic Soil Group—Dane County,Wisconsin <br /> Hydrologic Soil Group <br /> SEE <br /> Hydrologic Soil Group—Summary by Map Unit—Da <br /> Map unit symbol Map unit name Rating <br /> DnC2 Dodge silt loam,6 to 12 C <br /> • percent slopes, <br /> eroded <br /> ScB St.Charles silt loam,2 to B 0.3 I 8.9% <br /> 6 percent slopes <br /> TrB Troxel silt barn, 1 to 3 B 1.0 27.2% <br /> percent slopes <br /> Totals for Area of Interest 3.7 100.0% <br /> Description <br /> Hydrologic soil groups are based on estimates of runoff potential. Soils are <br /> assigned to one of four groups according to the rate of water infiltration when the <br /> soils are not protected by vegetation, are thoroughly wet,and receive precipitation <br /> from long-duration storms. <br /> The soils in the United States are assigned to four groups(A, B, C,and D)and <br /> three dual classes(A/D, B/D,and C/D)_The groups are defined as follows: <br /> Group A. Soils having a high infiltration rate(low runoff potential)when thoroughly <br /> wet. These consist mainly of deep,well drained to excessively drained sands or <br /> gravelly sands. These soils have a high rate of water transmission. <br /> Group B.Soils having a moderate infiltration rate when thoroughly wet.These <br /> consist chiefly of moderately deep or deep, moderately well drained or well drained <br /> soils that have moderately fine texture to moderately coarse texture. These soils <br /> have a moderate rate of water transmission. <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 <br /> at 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(ND, B/D,or C/O),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 /> TNatural Resources Web Soil Survey 1'/912015 <br /> Conservation Service National Cooperative Soil Survey Page 3 of 4 <br />