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<br />Lv- Loamy alluvial land, gravelly substratum. Occurs as small areas in major <br />drainageways, and is a principle source of gavel in the County. Nearly always subject <br />to flooding from streams. The soils are shallow and stratified with strata that are of <br />moderately coarse textured to moderately fine textured material that is underlain by <br />river sand and gavel. In some places the soils are slightly influenced by soluble salts. <br />The soils absorb water at a rapid to slow rate and the available water capacity is low, <br />but many areas have a high water table which is beneficial to plant growth. <br />Lw- Loamy alluvial land, moderately wet. Occurs in many drainageways throughout the <br />County. It is predominantly in the broader, large, and more gently sloping <br />drainageways with a high water table and subject to flooding along the S. Platte River. <br />The soils are moderately deep, ranging from 20" to 36" in depth over unconsolidated <br />sand and gravel. They are dark-colored loam to clay loam in texture and generally <br />stratified. They are normally noncalcareous, but moderately influenced by soluble <br />salts in places. Thin lenses of sand, silt, or fine gravel may be in any of the layers. <br />The soils absorb water at a moderate to slow rate and the available water capacity is <br />low, and most of this land is used for irrigated farming. <br />NuB- Nunn clay loam, 1 to 3% slopes. The soils are well drained, nearly level soils on <br />terraces that formed in loamy alluvial material, that generally are present on terraces <br />along major streams in the County in long narrow areas roughly parallel to steam <br />channels. In a representative profile, the surface layer is grayish-brown loam about 6" <br />thick that is noncalcareous. The subsoil is dark grayish-brown and grayish-brown <br />clay about 17" thick that is noncalcareous. The underlying material, below a depth <br />of 23", is light yellowish-brown and grayish-brown loam and silt loam that is highly <br />calcareous and stratified. The soils absorb water at a moderate rate, the available <br />water capacity is high, and permeability is slow in Nunn soils that have a clay loam <br />surface layer. Runoff is medium, and the hazard of water erosion is moderate. <br />Sm- Sandy alluvial land consists of unstable accumulation of gravelly and sandy alluvium. <br />It consists of material that was transported by water from the sand and gravel beds <br />in the adjacent areas. It is stratified because of periodic flooding, and thin lenses or <br />small pockets of silt, clay, and sand are also mixed with gravel. Generally, this land <br />is either barren, or has only a sparse cover of weeds, and is often utilized for grazing. <br />Tc- Terrace escarpments occur as breaks or steep side slopes adjacent to the channels of <br />present or former streams. They also occur as the steep faces of terraces that border <br />bottom lands and floodplains. The surface layer varies in reaction from place to place <br />and in places is calcareous. Some areas are used for grazing, but the soils are usually <br />too steep, too shallow, or too unstable for cultivation for good grass management, <br />and much of this soil is mined for sand and gavel. <br />2 <br />