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' 44 Soil Survey ' table. The occasional flooding is a hazard. Areas Available water capacity is moderate. The effective adjacent to levees are subject to lateral seepage in wet rooting depth of the crops commonly grown in the years when the water level is high. Careful applications county is limited by an apparent water table at a depth ' of irrigation water are needed to prevent the buildup of of 3 to 5 feet. Runoff is slow, and the hazard of water a high water table. Tile drainage can lower the water erosion is moderate. The rate of water intake in table if a suitable outlet is available. Most climatically irrigated areas is 1.5 inches per hour. The hazard of ' adapted crops can be grown if the soil is protected from soil blowing is slight. The soil is subject to frequent, flooding late in spring and if a drainage system is brief or long periods of flooding from December through installed. The risk of flooding can be reduced by levees April. Channeling and deposition are common along and diversions. Furrow, border, and sprinkler irrigation streambanks. ' systems are suitable. Maintaining crop residue on or Most areas are used for recreational development or near the surface helps to prevent excessive runoff, wildlife habitat. A few areas have been converted to reduces the hazard of soil blowing, and helps to irrigated cropland. This unit may provide wetland ' maintain the rate of water intake and the organic matter functions and values. These should be considered in content. plans for enhancement of wildlife habitat or land use If this unit is used for homesite development, the conversion. main limitation is the high water table, The occasional Where this unit is used for recreational development, ' flooding is a hazard. The high water table increases the general management considerations include the possibility that septic tank absorption fields will not hazards of flooding and soil blowing. Protection from function properly. A drainage system is needed if roads flooding is needed. A drainage system is needed in or building foundations are constructed. Dikes and areas used for paths and trails. Areas used for ' channels that have outlets for floodwater can be used to recreation can be protected from soil blowing and dust protect buildings and onsite sewage disposal systems by a good plant cover, from flooding. Where this unit is used for irrigated row or field This map unit is in capability units Ilw-2 (MLRA-17), crops, the main limitation is the high water table. irrigated, and IVw-2 (MLRA-17), nonirrigated. It is in General management considerations include the hazard vegetative soil group A. of frequent flooding and the channeled landscape. ' Areas adiacent to levees are subject to lateral seepage 132—Columbia fine sandy loam, channeled, in wet years when the water level is high. Careful partially drained, 0 to 2 percent slopes, frequently applications of irrigation water are needed to prevent flooded. This very deep, somewhat poorly drained, the buildup of a high water table. Tile drainage can ' nearly level soil is on flood plains. It formed in alluvium lower the water table if a suitable outlet is available. derived from mixed rock sources. The landscape is Furrow, border, and sprinkler irrigation systems are channeled by intermittent drainageways. Mottles in the suitable. Most climatically adapted crops can be grown ' profile indicate a somewhat poorly drained soil; if the soil is protected from flooding late in spring and however, drainage has been improved by reclamation early in summer and if a drainage system is installed. projects. Elevation is 10 to 55 feet. The average annual The channeled landscape may require deep cuts that precipitation is about 12 inches, the average annual air will expose the stratified substratum. Maintaining crop ' temperature is about 60 degrees F, and the average residue on or near the surface helps to prevent frost-free period is about 270 days. excessive runoff, reduces the hazard of soil blowing, Typically, the surface layer is pale brown fine sandy and helps to maintain the rate of water intake and the loam about 12 inches thick. The underlying material to a organic matter content. depth of 60 inches is stratified light gray, brown, This map unit is in capability units Illw-2 (MLRA-17), yellowish brown, and light brownish gray, mottled silt irrigated, and IVw-2 (MLRA-17), nonirrigated. It is in loam, fine sandy loam, and sand. In some areas the vegetative soil group A, ' surface layer is loam. Included in this unit are small areas of Dello and 133—Columbia fine sandy loam, clayey Merritt soils in landscape positions similar to those of substratum, partially drained, 0 to 2 percent slopes. ' the Columbia soil. Also included are small areas of soils This very deep, somewhat poorly drained, nearly level that have a surface layer of sand or a buried soil is on flood plains. It formed in alluvium derived from substratum of moderately fine textured or fine textured mixed rock sources. Mottles in the profile indicate a material below a depth of 30 inches. Included areas somewhat poorly drained soil; however, drainage has make up about 15 percent of the total acreage. been improved by levees and reclamation projects. Permeability is moderately rapid in the Columbia soil. Elevation is 10 to 20 feet_ The average annual 1