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' 138 Soil Survey
<br /> inches or more. Depth to the water table is more than 6 capacity is very high. The effective rooting depth of the
<br /> ' feet, but water may be perched above the stratified crops commonly grown in the county is limited by an
<br /> substratum after periods of heavy rainfall or irrigation. apparent water table that is regulated at a depth of 3 to
<br /> Runoff is slow, and the hazard of water erosion is 4 feet by pumping. This soil is subject to subsidence.
<br /> t slight. The rate of water intake in irrigated areas is 1.5 Runoff is very slow, and the hazard of water erosion is
<br /> inches per hour. The hazard of soil blowing is slight. slight. The hazard of soil blowing is severe. The soil is
<br /> The soil is subject to rare flooding, which occurs during subject to rare flooding, which occurs during years of
<br /> years of abnormally high precipitation. abnormally high precipitation.
<br /> ' Most areas are used for irrigated crops, orchards, or Most areas are used for irrigated crops. This unit
<br /> vineyards. A few areas are used for homesite may provide wetland functions and values. These
<br /> development. This unit may provide wetland functions should be considered in plans for enhancement of
<br /> ' and values. These should be considered in plans for wildlife habitat or land use conversion.
<br /> enhancement of wildlife habitat or land use conversion. This unit is suited to irrigated row and field crops.
<br /> This unit Is well suited to irrigated row, field, orchard, The main limitations are subsidence, the high water
<br /> and vineyard crops. It has few limitations. Areas table, and the slow permeability. General management
<br /> ' adjacent to levees are subject to lateral seepage in wet considerations include the severe hazard of soil
<br /> years when the water level is high. Furrow, border, and blowing. Because this soil is subject to differential
<br /> sprinkler irrigation systems are suitable. Maintaining subsidence, frequent leveling of the fields is needed to
<br /> ' crop residue on or near the surface helps to prevent improve the efficiency of irrigation. Areas adjacent to
<br /> excessive runoff and soil blowing and helps to maintain levees are subject to lateral seepage in wet years when
<br /> the rate of water intake and the organic matter content. the water level is high. Careful applications of irrigation
<br /> If this unit is used for homesite development, general water are needed to prevent the buildup of a high water
<br /> ' management considerations include the hazard of rare table. Large ditches and small spud ditches provide
<br /> flooding. Houses, roads, and streets should be subirrigation and improve drainage. Because of the
<br /> constructed above expected flood levels. restricted permeability, water applications should be
<br /> ' This map unit is in capability class I (MLRA-17), regulated so that the water does not stand on the
<br /> irrigated, and capability unit IVc-1 (MLRA-17), surface and damage the crops. Subirrigation, furrow,
<br /> nonirrigated. It is in vegetative soil group A. border, and sprinkler systems are suitable. Where a
<br /> Subirrigation system is used, the water table is raised to
<br /> ' 273—Webile muck, partially drained, 0 to 2 percent a depth of 1 foot at planting time and then is slowly
<br /> slopes. This very deep, very poorly drained, nearly lowered during the growing season until it is at a depth
<br /> level soil is on deltas. It formed in hydrophytic plant of about 5 feet at harvest time. When the wind velocity
<br /> ' remains derived from reeds and tules and in alluvium is high in spring, the hazard of soil blowing can be
<br /> derived from mixed rock sources. Levees, drainage reduced by properly managing all crop residue and by
<br /> ditches, and pumping of the water table alter the minimizing tillage. Levees should be checked
<br /> drainage of this soil. Elevation is 15 feet below sea periodically, and a proper maintenance program should
<br /> ' level to sea level. The average annual precipitation is be developed.
<br /> about 14 inches, the average annual air temperature is This map unit is in capability units Illw-10 (MLRA-16),
<br /> about 60 degrees F, and the average frost-free period is irrigated, and IVw-10 (MLRA-16), nonirrigated. It is in
<br /> ' about 270 days. vegetative soil group E.
<br /> Typically, the surface layer is very dark gray and
<br /> variegated very dark brown and dark yellowish brown 274—Willows clay, partially drained, 0 to 2 percent
<br /> muck about 39 inches thick. The underlying material to slopes. This very deep, poorly drained, nearly level,
<br /> ' a depth of 60 inches is dark gray and dark grayish saline-sodic soil is in basins. It formed in alluvium
<br /> brown, mottled clay and silty clay. In some areas the derived from mixed rock sources. Mottles in the profile
<br /> surface layer is mucky loam. indicate a poorly drained soil; however, drainage has
<br /> Included in this unit are small areas of Kingile, been improved by levees and reclamation projects.
<br /> Rindge, and Shinkee soils in landscape positions similar Elevation is 5 to 40 feet. The average annual
<br /> to those of the Webile soil. Also included are small precipitation is about 10 inches, the average annual air
<br /> areas of Peltier and Ryde soils on the slightly higher temperature is about 60 degrees F, and the average
<br /> ' parts of the landscape. Included areas make up about frost-free period is about 270 days.
<br /> 15 percent of the total acreage. Typically, the surface layer is gray clay about 20
<br /> Permeability is rapid in the upper part of the Webile inches thick. The subsoil to a depth of 60 inches is
<br /> ' soil and slow in the mineral substratum. Available water grayish brown, mottled clay. The soil is calcareous and
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