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Map Unit Description: Riverwash — Larimer County Area, Colorado <br />Larimer County Area, Colorado <br />92— Riverwash <br />Map Unit Setting <br />Elevation: 4,000 to 8,500 feet <br />Mean annual precipitation: 12 to 20 inches <br />Mean annual air temperature: 45 to 52 degrees F <br />Frost -free period: 75 to 150 days <br />Map Unit Composition <br />Riverwash: 100 percent <br />Description of Riverwash <br />Setting <br />Landform: Outwash terraces, overflow stream channels, flood plains <br />Down -slope shape: Linear <br />Across -s lope shape: Linear <br />Parent material: Sandy and gravelly alluvium <br />Properties and qualities <br />Slope: 0 to 3 percent <br />Drainage class: Somewhat excessively drained <br />Capacity of the most limiting layer to transmit water (Ksat): High to <br />very high (6.00 to 20.00 in /hr) <br />Frequency of flooding: Frequent <br />Calcium carbonate, maximum content: 5 percent <br />Maximum salinity: Nonsaline to very slightly saline (0.0 to 4.0 mmhos/ <br />cm) <br />Sodium adsorption ratio, maximum: 2.0 <br />Available water capacity: Very low (about 2.3 inches) <br />Interpretive groups <br />Land capability classification (irrigated): 6w <br />Land capability (nonirrigated): 7w <br />Typical profile <br />0 to 6 inches: Very gravelly sand <br />6 to 60 inches: Stratified very gravelly sand to clay <br />Data Source Information <br />Soil Survey Area: Larimer County Area, Colorado <br />Survey Area Data: Version 7, May 1, 2009 <br />USDA Natural Resources Web Soil Survey <br />Conservation Service National Cooperative Soil Survey <br />5/19/2011 <br />Page 1 of 1 <br />