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<br />. <br />I <br />,. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />I <br /> <br />The Rio Grande Canal serves land with soils of the <br />Gunbarre1-Mosca-San Luis, the Norte-Quamon-San Arcacio, and the <br />Sunu1-P1atoro-Gray Point soils associations. These soils range in <br />depth from 10 to 60 inches in nearly level or very gently-sloping <br />areas. The soils have developed on broad alluvial fans, terraces, and <br />floodplains. The compositions include sandy loam, gravelly sandy <br />loam, and gravelly sand. These groups are designated as Sl>1-SP and <br />GM-GP under the Unified Soil Classification System. <br /> <br />The Monte Vi sta Canal serves land of the Zinzer-San Aracio-Villa <br />Grove and the Hooper-Arena-San Luis soil associations. These groups <br />consist of sandy loam, sand, and sand to gravel (SM-SP) ranging in <br />depth from 10 to 60 inches. <br /> <br />Most soil s served by both canal s have a natural surface layer of <br />gravelly-sandy loam or loamy sand (SM) with low organic content and <br />weak structure that is susceptible to wi nd erosion if not managed <br />properly. Soil erosion due to surface water flow is generally low <br />due to low slopes and low precipitation. <br /> <br />For agricultural purposes, soils are further classed by the SCS <br />methodology according to suitability for a particular use. The land <br />capability classification is a system consisting of three levels used <br />to identify the suitability of a particular soil for growing most <br />types of field crops. The broadest levels are designated by Roman <br />nu~era1s through VIII, with progressively higher numbers indicating <br /> <br />,I I - 2 <br />