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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 <br />precipitation 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 <br />thoroughly wet. These consist mainly of deep, well drained to excessively <br />drained sands or gravelly sands. These soils have a high rate of water <br />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 <br />drained soils that have moderately fine texture to moderately coarse texture. <br />These soils 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 <br />water 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 <br />layer at or near the surface, and soils that are shallow over nearly impervious <br />material. 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 <br />their natural condition are in group D are assigned to dual classes. <br />Rating Options <br />Aggregation Method: Dominant Condition <br />Component Percent Cutoff: None Specified <br />Tie-break Rule: Higher <br />Hydrologic Soil Group—Hennepin County, Minnesota Orono Garage Condos <br />Natural Resources <br />Conservation Service <br />Web Soil Survey <br />National Cooperative Soil Survey <br />9/16/2024 <br />Page 4 of 4 <br />105