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The permeability of the Nihill soil is rapid. The effective rooting <br />depth is 30 to 40 inches and has a low available water capacity. <br />The surface runoff is slow, the erosion hazard moderate and has <br />a capability subclass VIe. <br />CLASSIFICATION OF MAJOR COMPONENTS <br />Nihill channery loam, 1 to 6 percent slopes; Family Loamy - skeletal, <br />Mixed (calcareous), Mesic Ustic Torriorthents. <br />INCLUSIONS <br />Included with this soil mapping unit are small areas of Arvada <br />and Ildefonso (Loamy - skeletal, Mixed, Mesic Ustollic Calciorthid) <br />soils which make up 10 to 15 percent of the mapping unit. Arvada <br />soil is found on the nearly level areas while Ildefonso is found <br />• on the steeper portion of the landscape. <br />MAPPING UNIT 59 DE - NIHILL CHANNERY LOAM <br />6 TO 25 PERCENT SLOPES <br />The description of Mapping Unit 59DE is the same as Mapping Unit <br />59BC. The only element that varies here is the description of <br />a typical profile. <br />Usually, the surface layer is light gray, channery loam about 11 <br />inches thick; the subsurface layer is very pale brown, stony loam <br />about 7 inches thick. The underlying layer is very pale brown, <br />extremely stony and channery loam that extends to a depth of more <br />than 70 inches. The reaction is mildly to strongly alkaline through- <br />out the profile. <br /> <br />I-14 <br />