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[San Joaquin County, California 43
<br /> management considerations include the hazard of rare high water table. Maintaining crop residue on or near
<br /> flooding. Houses, roads, and streets should be the surface helps to prevent excessive runoff, reduces
<br /> constructed above expected flood levels. the hazard of soil blowing, and helps to maintain the
<br /> This map unit is in capability class I (MLRA-17), rate of water intake and the organic matter content.
<br /> irrigated, and capability unit iVc-1 (MLRA-17), If this unit is used for homesite development, general
<br /> nonirrigated. It is in vegetative soil group A. management considerations include the hazard of rare
<br /> flooding. Houses, roads, and streets should be
<br /> 130—Columbia fine sandy loam, drained, 0 to 2 constructed above expected flood levels.
<br /> percent slopes. This very deep, somewhat poorly This map unit is in capability units IIs-2 (MLRA-17),
<br /> drained, nearly level soil is on flood plains. It formed in irrigated, and IVs-2 (MLRA-17), nonirrigated. It is in
<br /> r` alluvium derived from mixed rock sources. Mottles in vegetative soil group A.
<br /> the profile indicate a somewhat poorly drained soil;
<br /> however, drainage has been improved by levees and 131—Columbia fine sandy loam, partially drained,
<br /> .I reclamation projects. Elevation is sea level to 100 feet. 0 to 2 percent slopes, occasionally flooded. This very
<br /> The average annual precipitation is about 14 inches, deep, somewhat poorly drained, nearly level soil is on
<br /> the average annual air temperature is about 60 degrees flood plains. It formed in alluvium derived from mixed
<br /> F, and the average frost-free period is about 270 days. rock sources. Mottles in the profile indicate a somewhat
<br /> Typically, the surface layer is pale brown fine sandy poorly drained soil; however, drainage has been
<br /> loam about 12 inches thick. The underlying material to a improved by reclamation projects. Elevation is 10 to 30
<br /> t depth of 60 inches is stratified light gray, brown, pale feet. The average annual precipitation is about 14
<br /> '.brown, and yellowish brown, mottled silt loam, fine inches, the average annual air temperature is about 60
<br /> sandy loam, and loamy fine sand. In some areas the degrees F, and the average frost-free period is about
<br /> surface layer is loam. 270 days.
<br /> Included in this unit are small areas of Dello, Egbert, Typically, the surface layer is pale brown fine sandy
<br /> Grangeviile, Guard, and Merritt soils in landscape loam about 12 inches thick. The underlying material to a
<br /> positions similar to those of the Columbia soil and depth of 60 inches is stratified light brownish gray and
<br /> Cogna soils on the slightly higher parts of the brown, mottled sandy loam and fine sandy loam. In
<br /> .,"landscape. Also included are small areas of Columbia some areas the surface layer is loam or
<br /> -:- silty clay P Y Y Y loam.
<br /> soils that have moderately fine textured overwash. Included in this unit are small areas of Dello,
<br /> Included areas make up about 15 percent of the total Grangeville, and Merritt soils in landscape positions
<br /> :iacreage. similar to those of the Columbia soil. Also included are
<br /> E Permeability is moderately rapid in the Columbia soil. small areas of Columbia soils that have a surface layer
<br /> '"Available water capacity is moderate. The effective of sand or a buried substratum of fine textured material
<br /> ,rooting depth is 60 inches or more. The water table has below a depth of 30 inches. Included areas make up
<br /> ��,a=been lowered to a depth of 6 feet or more through about 15 percent of the total acreage.
<br /> drainage systems, but water may be perched above the Permeability is moderately rapid in the Columbia soil.
<br /> :stratified substratum after periods of heavy rainfall or Available water capacity is moderate. The effective
<br /> irrigation. Runoff is slow, and the hazard of water rooting depth of the crops commonly grown in the
<br /> erosion is slight. The rate of water intake in irrigated county is limited by an apparent water table that has
<br /> areas is 1.5 inches per hour. The hazard of soil blowing been lowered to a depth of 3 to 5 feet through drainage
<br /> Is slight. The soil is subject to rare flooding, which systems that require continual maintenance. Runoff is
<br /> occurs during years of abnormally high precipitation. slow, and the hazard of water erosion is slight. The rate
<br /> Most areas are used for irrigated crops, orchards, or of water intake in irrigated areas is 1.5 inches per hour.
<br /> �wineyards. A few areas are used for homesite The hazard of soil blowing is slight. The soil is subject
<br /> ;development. This unit may provide wetland functions to occasional, brief or long periods of flooding from
<br /> and values. These should be considered in plans for December through April.
<br /> enhancement of wildlife habitat or land use conversion. Most areas are used for irrigated crops, orchards, or
<br /> This unit is suited to irrigated row, field, orchard, and vineyards. A few areas are used for homesite
<br /> k "lyineyard crops. It has few limitations. Areas adjacent to development. This unit may provide wetland functions
<br /> Ilevees are subject to lateral seepage in wet years when and values. These should be considered in plans for
<br /> the water level is high. Furrow, border, and sprinkler enhancement of wildlife habitat or land use conversion.
<br /> f ,rrigation systems are suitable. Careful applications of This unit is suited to irrigated row, field, orchard, and
<br /> :.irrigation water are needed to prevent the buildup of a vineyard crops. The main limitation is the high water
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