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Custom Soil Resource Report <br /> 27—Heldt silty clay, 1 to 3 percent slopes <br /> Map Unit Setting <br /> National map unit symbol. 3624 <br /> Elevation: 4,950 to 5,050 feet <br /> Mean annual precipitation: 11 to 17 inches <br /> Mean annual air temperature. 46 to 59 degrees F <br /> Frost-free period: 110 to 150 days <br /> Farmland classification: Prime farmland if irrigated and the product of I (soil <br /> erodibility) x C (climate factor) does not exceed 60 <br /> Map Unit Composition <br /> Heldt and similar soils: 85 percent <br /> Minor components. 15 percent <br /> Estimates are based on observations, descriptions, and transects of the mapunit. <br /> Description of Heldt <br /> Setting <br /> Landform: Plains <br /> Down-slope shape. Linear <br /> Across-slope shape: Linear <br /> Parent material: Sediment alluvium derived from shale <br /> Typical profile <br /> H1 - 0 to 7 inches: silty clay <br /> H2- 7 to 60 inches. silty clay <br /> Properties and qualities <br /> Slope: 1 to 3 percent <br /> Depth to restrictive feature. More than 80 inches <br /> Natural drainage class: Well drained <br /> Runoff class: Low <br /> Capacity of the most limiting layer to transmit water(Ksat): Moderately low to <br /> moderately high (0.06 to 0.20 in/hr) <br /> Depth to water table: More than 80 inches <br /> Frequency of flooding: None <br /> Frequency of ponding: None <br /> Calcium carbonate, maximum in profile: 10 percent <br /> Gypsum, maximum in profile. 1 percent <br /> Salinity, maximum in profile: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm) <br /> Sodium adsorption ratio, maximum in profile: 10.0 <br /> Available water storage in profile: High (about 9.6 inches) <br /> Interpretive groups <br /> Land capability classification (irrigated): 3e <br /> Land capability classification (nonirrigated): 4c <br /> Hydrologic Soil Group: C <br /> Ecological site. Clayey Plains (R067BY042CO) <br /> 18 <br />