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• PRELL?•~Pil~.RY DRAFT l~i, AEA 12A--Englewood Clay Loam, 0 to 2 Percent Slopes This is a deep, well drained soil forming on near]y level to ;entl;: slopin3 alluvial fans, flood plains and concave, 1~: Lfin~ areas on terraces. It forned in calcareo~is clayey alluvial parent materials weat:rered from sedimentary rock. Average annual precipitation is 15 to 1, inches. Slopes are near7;~ level to gentJ,y sloping. ~ Included in this unit are s;*.a11 areas of Denver clad loam on :.lopes of C to 2 percent. Typically the surface layer is very dark grayish 'Drown clay loam about 5 inches trick. The subsoil is very dark grayish brow^ clay a:rcut 25 inches thick. The substrat~_r::r is olive gray heavy clay loam :ritfr visible calcium carbonate concretions, extendin; to depths o: 6Q inches or more. Permeability is slow. Effective rooting depth is o0 inches or more. ', Available water capacity is high. Surface runoff is rapid, water erosion i hazard and grind erosion hazards are slight. These soils are subject to occasional brief flooding during spring and summer months by runoff from adjoining slopes. ~ This soil is used for irrigated and nonirrigated cropland, range acrd urban uses. Tillage may be difficult due to the amount of clay in the soil, and operations should be Y.ept to a minimum to prevent compaction, Management concerns in irrigated areas of this soil are efficient use of irrigation water and measures to prevent salt buildup. Using irrigation water and measures to pre•re nt excess upward salt movement, '~ these soils are suitable for border and furrow irrigation. i In nonirrigated areas, the Brain concerns of management are conserving moisture and protectin3 the soil from erosion. Practices such as strip- cropping perpendicular to the prevailing wind and leaving stubble mulch on soil not protected by a growing crop help to prevent wind erosion. Incor- porating crop residues in or on the surface is also an effective means of improving soil tilth, conserving o~oisture, and protecting soil. Rangeland vegetation is mostly midgrasses and cool season forbs, typ- ical of the Clayey Foothills Range Site. Dominant grasses are western wheatgrass, green needlegrass, blue grams, buffalo grass, Indian rice~~rass, and native bluegrasses. Common forbs are winterfat, small pod vetch, fringed sage, and arnica. Controlled grazing is needed to maintain vigor in key forage species. Periodic summer deferment of grazing will help i~c[prove or maintain range conditions. Fencing and careful location of livestock watering facilities improves grazing distribution.