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58 Soil Survey are used for homesite development. This unit may Egbert soils that have a water table below a depth of 5 provide wetland functions and values. These should be feet. Included areas make up about 15 percent of the considered in plans for enhancement of wildlife habitat total acreage. or land use conversion. The Egbert soil is very deep and poorly drained. It This unit is suited to irrigated row and field crops. formed in alluvium derived from mixed rock sources. The main limitations are the slow permeability and the Mottles in the profile indicate a poorly drained soil; high water table. General management considerations however, drainage has been improved by levees and include the hazard of soil blowing. Because of the reclamation projects. Typically, the surface layer is gray restricted permeability, water applications should be silty clay loam about 6 inches thick. The next 25 inches regulated so that the water does not stand on the is mottled gray and dark gray silty clay loam. The surface and damage the crops. Areas adjacent to underlying material to a depth of 60 inches is olive gray levees are subject to lateral seepage in wet years when clay loam. In some areas the surface layer is silty clay. the water level is high. Careful applications of irrigation Permeability is slow in the Egbert soil. Available water are needed to prevent the buildup of a high water water capacity is high. The shrink-swell potential also is table. Deep drainage ditches can lower the water table high. The effective rooting depth of the crops commonly _ if a suitable outlet is available. Furrow, border, and grown in the county is limited by an apparent water sprinkler irrigation systems are suitable. When the wind table that has been lowered to a depth of 4 to 6 feet velocity is high in spring, the hazard of soil blowing can through drainage systems that require continual be reduced by properly managing all crop residue and maintenance. Runoff is slow, and the hazard of water by minimizing tillage. erosion is slight. The rate of water intake in irrigated If this unit is used for homesite development, the areas is 0.3 inch per hour. The hazard of soil blowing is main limitations are the high shrink-swell potential, low moderate. The soil is subject to rare flooding, which strength, the rapid permeability in the substratum, and occurs during years of abnormally high precipitation. the high water table. The rare flooding is a hazard. Urban land consists of areas covered by roads, Properly designing foundations and footings and driveways, parking lots, buildings, and other structures. _ diverting runoff away from buildings help to prevent the The soil material under the impervious surface is similar structural damage caused by shrinking and swelling. to that of Egbert silty clay loam. Properly designing buildings and roads can offset the Most areas are used for urban development. A few limited ability of the soil to support a load. Community areas are used for irrigated crops. This unit may sewage systems may be needed because seepage provide wetland functions and values. These should be from onsite sewage disposal systems can result in the considered in plans for enhancement of wildlife habitat contamination of water supplies. The high water table or land use conversion. _ increases the possibility that septic tank absorption Where the Egbert soil is used for urban development fields will not function properly. A drainage system is the main limitations are the high shrink-swell potential, needed if roads or building foundations are constructed. low strength, the high water table, and the slow Houses, roads, and streets should be constructed permeability. General management considerations above expected flood levels. include the hazard of rare flooding and the hazard of This map unit is in capability units Ilw-2 (MLRA-16), soil blowing. Properly designing foundations and irrigated, and IVw-2 (MLRA-16), nonirrigated. It is in footings and diverting runoff away from buildings help t,_ vegetative soil group C. prevent the structural damage caused by shrinking and swelling. Properly designing buildings and roads can 155—Egbert-Urban land complex, partially drained, offset the limited ability of the soil to support a load. A 0 to 2 percent slopes. This nearly level map unit is on drainage system is needed if roads or building flood plains. Elevation is sea level to 15 feet. The foundations are constructed. The slow permeability and average annual precipitation is about 14 inches, the the high water table increase the possibility that septic average annual air temperature is about 60 degrees F, tank aortion roads,andpstre ties will not s Isdhould be constructed cted aboveHouses. and the average frost-free period is about 270 days. This unit is 50 percent Egbert silty clay loam and 35 expected flood levels. percent Urban land. The components of this unit occur The Egbert soil is suited to irrigated row and field as areas so intricately intermingled that it was not crops. The main limitations are the slow permeability practical to map them separately at the scale used. andthe high water able.appliB ecause ons should of e ee rictedd so Included in this unit are small areas of Stockton, permeability, water htly higher that the water does Ja is of t, and landscape. ho soils on the Also included are small areas of damage he crops. Areastand s adjacent to levees are subjec parts of the landscape. A