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<br /> 42 Soil Survey
<br /> Most areas of this unit are used for irrigated crops or This unit is well suited to irrigated row, field, and
<br /> orchards. A few areas are used for homesite orchard crops. It has few limitations. Furrow, border,
<br /> development. and sprinkler irrigation systems are suitable. Returning
<br /> This unit is well suited to irrigated row, field, and crop residue to the soil or regularly adding other organic
<br /> orchard crops. General management considerations material improves fertility, minimizes crusting, and
<br /> F, include the hazard of soil blowing. Furrow, border, and maintains the rate'of water intake.
<br /> sprinkler irrigation systems are suitable. When the wind If this unit is used for homesite development, general
<br /> Fvelocity is high in spring, the hazard of soil blowing can management considerations include the hazard of rare be reduced by properly managing all crop residue and flooding. Houses, roads, and streets should be i
<br /> by minimizing tillage. constructed above expected flood levels.
<br /> rIf this unit is used for homesite development, the This map unit is in capability class I (MLRA-17),
<br /> Fmain limitation is the moderately slow permeability. On irrigated, and capability unit iVc-1 (MLRA-17),
<br /> sites for septic tank absorption fields, the restricted nonirrigated. It is in vegetative soil group A.
<br /> permeability can be overcome by increasing the size of
<br /> the absorption field. 129—Cogna loam, 0 to 2 percent slopes. This very
<br /> This map unit is in capability class I (MLRA-17), deep, well drained, nearly level soil is on low fan
<br /> irrigated, and capability unit IVc-1 (MLRA-17), terraces. It formed in alluvium derived from mixed rock
<br /> nonirrigated. It is in vegetative soil group A. sources. A few areas are dissected by intermittent
<br /> G sloughs that have been filled as a result of land
<br /> 128—Cogna fine sandy loam, 0 to 2 percent leveling. Elevation is 40 to 130 feet. The average
<br /> slopes, overwashed. This very deep, well drained, annual precipitation is about 16 inches, the average
<br /> nearly level soil is on alluvial fans. It formed in alluvium annual air temperature is about 60 degrees F, and the:.
<br /> i Fderived from mixed rock sources. A few areas are average frost--free period is about 270 days.
<br /> it dissected by intermittent sloughs that have been filled Typically, the surface layer is dark grayish brown aril
<br /> as a result of land leveling. Elevation is 70 to 150 feet. dark brown loam about 25 inches thick. The subsoil and
<br /> The average annual precipitation is about 16 inches, the underlying material to a depth of 64 inches are
<br /> the average annual air temperature is about 60 degrees brown clay loam and pale brown and brown loam. In F•
<br /> F, and the average frost-free period is about 270 days. some areas the surface layer is clay loam or silt loam:
<br /> Typically, the surface layer is brown fine sandy loam Included in this unit are small areas of Archerdale,r
<br /> about 18 inches thick. Below this is a buried surface Boggiano, and Vignolo soils in landscape positions
<br /> layer of dark grayish brown loam about 20 inches thick. similar to those of the Cogna soil. Also included are
<br /> The subsoil and the underlying material to a depth of 60 small areas of Columbia soils in the slightly lower
<br /> F;" inches are dark grayish brown loam and silt loam. In positions. Included areas make up about 15 percent.,,
<br /> some areas the surface layer is loam or silt loam. the total acreage.
<br /> Included in this unit are small areas of Archerdale Permeability is moderate in the Cogna soil. AvailabI
<br /> water capacity is high. The effective rooting depth is
<br /> soils in landscape positions similar to those of the6©�
<br /> Cogna soil and Columbia soils in the slightly lower inches or more. Runoff is slow, and the hazard of wit
<br /> positions. Also included are small areas of Cogna soils erosion is slight. The rate of water intake in irrigated
<br /> that have moderately coarse textured overwash layers areas is 1.0 inch per hour. The soil is subject to rare
<br /> up to 35 inches thick. Included areas make up about 15 flooding, which occurs during years of abnormally lig+
<br /> percent of the total acreage. precipitation.
<br /> �< Permeability is moderate in the Cogna soil. Available Most areas are used for irrigated crops or orchard
<br /> �,. water capacity is high. The effective rooting depth is 60 A few areas are used for homesite development. Thi
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<br /> !;! inches or more. Runoff is slow, and the hazard of water unit may provide wetland functions and values. Ties. ,
<br /> erosion is slight. The rate of water intake in irrigated should be considered in plans for enhancement of;
<br /> areas is 1.5 inches per hour. The soil is subject to rare wildlife habitat or land use conversion.
<br /> flooding, which occurs during years of abnormally high This unit is well suited to irrigated row, field, and
<br /> precipitation. orchard crops. It has few limitations. Furrow, border
<br /> Most areas are used for irrigated crops or orchards. and sprinkler irrigation systems are suitable. RetUt
<br /> A few areas are used for homesite development. This crop residue to the soil or regularly adding othera
<br /> unit may provide wetland functions and values. These material improves fertility, minimizes crusting, an`d
<br /> should be considered in plans for enhancement of increases the rate of water intake.
<br /> wildlife habitat or land use conversion. If this unit is used for homesite development,�ge
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