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` •7' w • <br />12/42 <br />r TO--Fluvaquents and Haplaquolls soils, frequently <br />flooded. This unit is on flood plains and depressions of <br />stream terraces. Elevation is P,,9C10 to 8,000 feet. The <br />mean annual precipitation is it to_ 18 inches, the average <br />air temperature is 4U to 45 degrees F., and the frost free <br />period is b5 to '0'5 days. <br />The Fluvaquents sail is very deep and very poorly or <br />poorly drained. It formed in alluvium. The surface-layer <br />is dark grayish brown sandy loam, loam, or clay loam 2 to'S <br />inches thick. The underlying material is gray stratified <br />sand, loamy sand, sandy loam, loam, clay loam, or clay. In <br />Borne places sand or e::tr-emely gravelly sand is at a depth of <br />lu to 60 inches. <br />r <br />1. Permeability of the Fluvaquents soil is moderate to <br />rapid. Available water- capacity is low to high. Effective <br />rooting depth is ~U iaches or more for water--tc~Ierant. plants <br />ar~d lU t:. Z~"l i nches for• p I ants sensitive t~~ a h i gh~ water <br />table. F2un~?ff is slow or ponded, ari~i the hazard of water- <br />erosion is slight. The hazard of sr,ils blowing is slight. <br />A high water ta61e is at or near the surface during the <br />spring and early summer. In some areas the water table <br />remains above a depth of 1 foot throughout the year while in <br />other areas the water table is at a depth of 1 to ~ feet <br />during late summer, fall, and winter. The hazard of <br />flooding is frequent. <br />(_ ~ <br />.` <br />L' <br />