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' San Joaquin County, California 105 1 table alter the drainage of this soil. Elevation is 20 feet 225—Rindge muck, partially drained, 0 to 2 below sea level to 5 feet above. The average annual percent slopes. This very deep, very poorly drained, precipitation is about 14 inches, the average annual air nearly level soil is on deltas. It formed in hydrophytic temperature is about 60 degrees F, and the average plant remains derived from reeds and tules and in ' frost-free period is about 270 days. alluvium derived from mixed rock sources. Levees, Typically, the surface layer is very dark gray mucky drainage ditches, and pumping of the water table alter silt loam about 12 inches thick. The underlying material the drainage of this soil. Elevation is 20 feet below sea to a depth of 60 inches is black and very dark brown level to 5 feet above. The average annual precipitation ' mucky peat. In some areas the surface layer is mucky is about 14 inches, the average annual air temperature loam or muck. is about 60 degrees F, and the average frost-free period Included in this unit are small areas of Kingile and is about 270 days. Venice soils in landscape positions similar to those of Typically, the surface layer is very dark gray muck the Rindge soil. Also included are small areas of Peltier about 13 inches thick. The underlying material to a and Ryde soils on the slightly higher parts of the depth of 60 inches is very dark brown and very dark ' landscape. Included areas make up about 15 percent of gray mucky peat. In some areas the surface layer is the total acreage. mucky clay loam or mucky loam. Permeability is rapid in the Rindge soil. Available Included In this unit are small areas of Kingile and water capacity is very high. The effective rooting depth Venice soils in landscape positions similar to those of of the crops commonly grown in the county is limited by the Rindge soil. Also included are small areas of Peltier an apparent water table that is regulated at a depth of 3 and Ryde soils on the slightly higher parts of the to 4 feet by pumping. This soil is subject to subsidence. landscape. Included areas make up about 15 percent of ' Runoff is very slow, and the hazard of water erosion is the total acreage. slight. The rate of water intake in irrigated areas is 4.0 Permeability is rapid in the Rindge soil. Available inches per hour. The hazard of soil blowing is water capacity is very high. The effective rooting depth moderate. The soil is subject to rare flooding, which of the crops commonly grown in the county is limited by ' occurs during years of abnormally high precipitation. an apparent water table that is regulated at a depth of 3 Most areas are used for irrigated crops. This unit to 4 feet by pumping. This soil is subject to subsidence. may provide wetland functions and values. These Runoff is very slow, and the hazard of water erosion is ' should be considered in plans for enhancement of slight. The rate of water intake in irrigated areas Is 4.0 wildlife habitat or land use conversion. inches per hour. The hazard of soil blowing is severe. This unit is suited to irrigated row and field crops. The soil is subject to rare flooding, which occurs during The main limitations are subsidence and the high water years of abnormally high precipitation. table. General management considerations include the Most areas are used for Irrigated crops. This unit hazard of soil blowing. Because this soil is subject to may provide wetland functions and values. These differential subsidence, frequent leveling of the fields is should be considered in plans for enhancement of ' needed to improve the efficiency of irrigation. Areas wildlife habitat or land use conversion. adjacent to levees are subject to lateral seepage in wet This unit is suited to irrigated row and field crops. years when the water level is high. Careful applications The main limitations are subsidence and the high water of Irrigation water are needed to prevent the buildup of table. General management considerations include the ' a high water table. Large ditches and small spud severe hazard of soil blowing. Because this soil is ditches provide subirrigation and improve drainage. subject to differential subsidence, frequent leveling of Subirrigation, furrow, border, and sprinkler systems are the fields is needed to improve the efficiency of ' suitable. Where a subirrigation system is used, the irrigation. Areas adjacent to levees are subject to lateral water table is raised to a depth of 1 foot at planting time seepage in wet years when the water level is high. and then is slowly lowered during the growing season Careful applications of irrigation water are needed to until it is at a depth of about 5 feet at harvest time. prevent the buildup of a high water table. Large ditches When the wind velocity is high in spring, the hazard of and small spud ditches provide subirrigation and soil blowing can be reduced by properly managing all improve drainage. Subirrigation, furrow, border, and crop residue and by minimizing tillage. Levees should sprinkler systems are suitable. Where a subirrigation be checked periodically, and a proper maintenance system is used, the water table is raised to a depth of 1 program should be developed. foot at planting time and then is slowly lowered during This map unit is in capability units Illw-10 (MLRA-16), the growing season until it is at a depth of about 5 feet irrigated, and IVw-10 (MLRA-16), nonirrigated. It is in at harvest time. When the wind velocity is high in ' vegetative soil group E. spring, the hazard of soil blowing can be reduced by