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08/14/2008 15:01 15703456610 WASHINGTON COUNTY PAGE i1,i <br />18 Soil Survey <br />and maintenance of roads, streets, driveways, and <br />sidewalks. Dikes and channels that have outlets for <br />floodwater can be used to protect buildings and onsite <br />sewage disposal systems from flooding. Roads and <br />streets should be designed to offset the low strength of <br />the soil. <br />This map unit is in capability subclasses Ilw, irrigated, <br />and Illw, nonirrigated. It is in the Overflow range site. <br />12-Canyon gravelly loam. This shallow, well drained <br />soil is on hills, knolls, and ridges. It formed in calcareous <br />loamy material derived dominantly from sandstone. <br />Slope is 2 to 6 percent. Areas are generally elongated <br />and are 5 to 80 acres. <br />Typically, the surface layer is grayish brown gravelly <br />loam about 4 inches thick. The underlying material is <br />mainly light brownish gray very tine sandy loam and loam <br />about 10 inches thick over fine-grained sandstone. <br />Included in this unit are small areas of deep and <br />moderately deep soils. Included areas make up about 25 <br />percent of the total acreage. <br />Permeability of this Canyon soil is moderate Available <br />water capacity is very low. Effective rooting depth is 6 to <br />20 inches. Runoff is medium, and the hazard of water <br />erosion is moderate. The hazard of soil blowing is <br />moderate. <br />Most areas of this unit are used as rangeland. A few <br />areas are used for nonirrigated crops. <br />This unit is poorly suited to cultivated crops. It is <br />limited mainly by shallowness of the soil, the very low <br />available water capacity, and the hazard of soil blowing. <br />The potential plant community on this unit is mainly <br />little bluestem, sldeoats grams, prairie sandreed, sand <br />bluestem, and sedges. <br />The suitability of the soil in this unit for rangeland <br />seeding is poor. The main limitations are shallowness of <br />the soil and the very low available water capacity. <br />Figure t.-Area of Bridgeport silt loam In Overflow range site. Limestone Breaks In background.