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Custom Soil Resource Report <br />National Research Council. 1995. Wetlands: Characteristics and boundaries. C <br />Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. <br />Department of Agriculture Handbook 18. <br />Soil Survey Staff. 2006. Keys to soil taxonomy. 10th edition. U.S. Department of <br />Agriculture, Natural Resources Conservation Service. <br />Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making <br />and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service. <br />U.S. Department of Agriculture Handbook 436. <br />Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and <br />Delaware Department of Natural Resources and Environmental Control, Wetlands <br />Section. <br />United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of <br />Engineers wetlands delineation manual. Waterways Experiment Station Technical <br />Report Y-87-1. <br />Report Hydric Soils <br />Hydric Soils- Orange County, North Carolina <br />Map symbol and map unit name Component Percent of <br />map unit Landform Hydric <br />criteria <br />Ch-Chewacla loam <br /> Wehadkee, undrained 5 Depressions on flood plains 283, 4 <br />Lg-Lignum silt loam, 0 to 3 percent slopes <br />`~`' Wehadkee, undrained 2 Depre"ssions on flood plains 283, 4 <br />Water Features <br />This folder contains tabular reports that present soil hydrology information. The reports <br />(tables) include all selected map units and components for each map unit. Water <br />Features include ponding frequency, flooding frequency, and depth to water 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 assigned <br />to one of four groups according to the rate of water infiltration when the soils are not <br />protected by vegetation, are thoroughly wet, and receive precipitation from long- <br />duration storms. <br />The four hydrologic soil groups are: <br />`.~ <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 consist <br />chiefly of moderately deep or deep, moderately well drained or well drained soils that <br />32 <br />