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Huerfano County Area, Colorado • 27
<br /> brush. Also included are small areas of Goemmer cobbly
<br /> clay loam in the steeper areas of the unit.
<br /> Permeability of this Holderness soil is slow. Available
<br /> { water capacity is high. Effective rooting depth is 40 to 60
<br /> inches. Runoff is rapid, and the hazard of water erosion
<br /> is very high.
<br /> y. This unit is used as rangeland.
<br /> . .
<br /> The potential plant community is mainly Gambel oak
<br /> ` • -,,:� . I i and an understory of Arizona fescue, mountain muhly,
<br /> ti and western wheatgrass. The average annual production
<br /> of air-dry vegetation is about 1,400 pounds per acre. If
<br /> the condition of the range deteriorates, Gambel oak,
<br /> Kentucky bluegrass, New Mexico locust, and mulesear
<br /> wyethia increase.
<br /> " • �•L { ` If this unit is used for homesite development, the main
<br /> limitation is the shrink-swell potential. The effects of
<br /> y�•;i+ � shrinking and swelling can be reduced by maintaining a
<br /> r
<br /> constant moisture content around the foundation.
<br /> Lv •`'.-: '{:�"' `�c'�--`- -•, Backfilling with material that has low shrink-swell
<br /> potential can also reduce the effects of shrinking and
<br /> �•''�•� � wE -7 swelling. Erosion is a hazard in the steeper areas. Only
<br /> the part of the site that is used for construction should
<br /> •.. ,•=;�'1.'�;.`t rr •-, , ,......�,. be disturbed.
<br /> Septic tank absorption fields of conventional size do
<br /> not function adequately because of the slow permeability
<br /> of the soil. Other kinds of sewage disposal systems may
<br /> be needed.
<br /> This map unit is in capability subclass Vle,
<br /> -. ;; �.. �-: .• ,z:.,;.= nonirrigated. It is in Mountain Clay Loam range site.
<br /> 26—Kim fine sandy loam, 3 to 9 percent slopes.
<br /> :'`•' .`: ;�`- << `�.��`�i� This deep, well drained soil is on uplands. It formed in
<br /> '•r''=, _ : "`` y r eolian silt and fine sand. The native vegetation is mainly
<br /> grass. Elevation is 5,500 to 6,500 feet. The average
<br /> „��.+'...• :tit;'_::,. _.•, ,_ ,.
<br /> annual precipitation is 12 to 15 inches, the average
<br /> - ,._...-,.. - F.• ^..;:� - ':-' ', ,'_• .'' annual air temperature is 50 to 54 degrees F, and the
<br /> average frost-free period is 135 to 165 days.
<br /> A Typically, the surface layer is brown fine sandy loam 6
<br /> inches thick. Below this to a depth of 60 inches or more
<br /> is loam. The soil is mildly alkaline to a depth of 6 inches
<br /> Figure 2—Profile or Haverson clay loam. Note and moderately alkaline below that depth.
<br /> stratification that is typical of soils on flood Included in this unit is about 15 percent Otero fine
<br /> plains and low terraces. sandy loam on ridges. Also included are small areas of
<br /> Travessilla channery sandy loam near areas of Rock
<br /> brush and grass. Elevation is 7,500 to 8,500 feet. The outcrop.
<br /> average annual precipitation is 16 to 18 inches, the Permeability of this Kim soil is moderate. Available
<br /> average annual air temperature is 40 to 44 degrees F, water capacity is high. Effective rooting depth is 60
<br /> and the average frost-free period is 75 to 90 days. inches or more. Runoff is medium, and the hazard of
<br /> Typically, the surface is covered with a layer of water erosion is high to very high.
<br /> partially decomposed oak leaves 2 inches thick. The This unit is used as rangeland.
<br /> surface layer is dark grayish brown loam about 8 inches The potential plant community on this unit is mainly
<br /> blue grama and sideoats grama. Other grasses that
<br /> thick. The subsoil is mainly clay about 43 inches thick. characterize the unit are Indian ricegrass and western
<br /> Soft, weathered siltstone is at a depth of 51 inches. The wheatgrass. The average annual production of air-dry
<br /> soil is neutral to a depth of 4 inches and mildly alkaline vegetation is about 900 pounds per acre. If the condition
<br /> below that depth. of the range deteriorates, blue grama, sand dropseed,
<br /> Included in this unit is about 10 percent Fughes sandy threeawn, snakeweed, and rabbitbrush increase. Range
<br /> clay loam in small grassy parks within areas of oak seeding is suitable if the range is in poor condition.
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