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Map Unit Composition <br />Riverwash: 90 percent <br />Estimates are based on observations, descriptions, and transects of the mapunit. <br />Description of Riverwash <br />Setting <br />Landform: Flood plains <br />Down-slope shape: Linear <br />Across-slope shape: Linear <br />Parent material: Sand & gravel alluvium <br />Typical profile <br />A - 0 to 6 inches: very gravelly sand <br />C - 6 to 60 inches: stratified extremely gravelly coarse sand to gravelly sand <br />Properties and qualities <br />Slope: 0 to 4 percent <br />Runoff class: Very high <br />Capacity of the most limiting layer to transmit water (Ksat): High to very high (6.00 <br />to 20.00 in/hr) <br />Depth to water table: About 0 to 24 inches <br />Frequency of flooding: Frequent <br />Available water storage in profile: Very low (about 1.8 inches) <br />Interpretive groups <br />Land capability classification (irrigated): None specified <br />Land capability classification (nonirrigated): 8w <br />Hydric soil rating: Yes <br />Minor Components <br />Bronell <br />Percent of map unit: <br />Hydric soil rating: No <br />Somewhat poorly drained soils <br />Percent of map unit: <br />Hydric soil rating: No <br />129—Wilid silt loam, 0 to 3 percent slopes <br />Map Unit Setting <br />National map unit symbol: 2qnmq <br />Elevation: 4,000 to 6,200 feet <br />Mean annual precipitation: 12 to 14 inches <br />Mean annual air temperature: 48 to 54 degrees F <br />Frost-free period: 125 to 175 days <br />Farmland classification: Prime farmland if irrigated <br />Custom Soil Resource Report <br />24