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<br /> <br />/8c• <br />157--Willwood-Sheppard, COOT, complex, 1 to 12 percent <br />slopes. T17is rnap unit is an alluvial fans. Elevation is <br />S,~CrG tc~ ~_•,Crir.<r feet. The avera3e annua I pr•ec i p i tat i on i s 7 <br />to 14 inches, the aver-a;7e annual air- ternper•atur-e is 45 to 4c <br />degrees F, and the average frost-free period is l0 to 105 <br />days. <br />This unit is 55~per-cent Willwood soiI and 35 percent <br />Sheppard soiI. <br />Included in this unit is about lir percent of a soiI <br />s irni I ar to t;li i s W i I Iwood soiI but has greater than 15 <br />percent calcium carbonate in the substr-aturn, accur•r•ing on <br />the same landscape positions as the dominant soils. <br />The Willwood soiI is deep and e>:cessively drained. It <br />for-rned in al luviurn derived d~~rninantly from sandstone and <br />quar•txite. Typically, the surface layer is yellowish brown <br />loamy sand c: incl'~es thicl;. The underlying rnater-ial to a <br />depth of GG incF~es is I fight reddish br-c~wn a>:tr-ernely cobbly <br />loamy sand. <br />Fer-rneat~i I ity t~f tY~e Wi I Iwood soiI is rapid. Available <br />water- capacity is very low. Effective rooting depth is s;0 <br />inches i~r- rnc~r-e. fiur~off is slow, grid the tiazar•d of water' <br />erosion is sfigl'it. The h~~zar-d of soiI blowing is high. <br />~- <br />