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Custom Soil Resource Report <br /> Water Features <br /> This folder contains tabular reports that present soil hydrology information. The <br /> reports (tables) include all selected map units and components for each map unit. <br /> Water Features include ponding frequency, flooding frequency, and depth to water <br /> table. <br /> Water Features <br /> This table gives estimates of various soil water features. The estimates are used in <br /> land use planning that involves engineering considerations. <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 four hydrologic soil groups are: <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 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. <br /> Surface runoff refers to the loss of water from an area by flow over the land surface. <br /> Surface runoff classes are based on slope, climate, and vegetative cover. The <br /> concept indicates relative runoff for very specific conditions. It is assumed that the <br /> surface of the soil is bare and that the retention of surface water resulting from <br /> irregularities in the ground surface is minimal. The classes are negligible, very low, <br /> low, medium, high, and very high. <br /> The months in the table indicate the portion of the year in which a water table, <br /> ponding, and/or flooding is most likely to be a concern. <br /> Water table refers to a saturated zone in the soil. The water features table indicates, <br /> by month, depth to the top ( upper limit) and base ( lower limit)of the saturated <br /> zone in most years. Estimates of the upper and lower limits are based mainly on <br /> 41 <br />