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106 Soil Survey properly managing all crop residue and by minimizing enhancement of wildlife habitat or land use conversion. tillage. Levees should be checked periodically, and a This unit is suited to irrigated row and field crops. proper maintenance program should be developed. The main limitation is depth to the hardpan, which limits This map unit is in capability units Illw-10 (MLRA-16), the suitability for deep-rooted plants. Where feasible, irrigated, and IVw-10 (MLRA-16), nonirrigated. It is in deep ripping of this restrictive layer can help to ` vegetative soil group E. overcome this limitation. Careful applications of irrigation water are needed to prevent the buildup of a 226—Rioblancho clay loam, drained, 0 to 2 percent high water table. A drainage system may be needed. slopes.This somewhat poorly drained, nearly level soil Furrow, border, and sprinkler irrigation systems are is on basin rims. It is moderately deep to a hardpan. It suitable. Returning crop residue to the soil or regularly formed in alluvium derived from mixed rock sources. adding other organic material improves fertility, Mottles in the profile indicate a somewhat poorly minimizes crusting, and increases the rate of water drained soil; however, drainage has been improved by intake. levees and reclamation projects. Elevation is sea level This unit is suited to irrigated pasture. Irrigation water to 30 feet. The average annual precipitation is about 14 can be applied by sprinkler and border methods. inches, the average annual air temperature is about 60 Leveling helps to ensure a uniform application of water. degrees F, and the average frost-free period is about Proper stocking rates, pasture rotation, and restricted 270 days. grazing during wet periods help to keep the pasture in Typically, the surface layer and the upper part of the good condition and protect the soil from compaction. r subsoil are gray, mottled clay loam about 16 inches If this unit is used for homesite development, the thick. The next 12 inches of the subsoil is variegated main limitations are depth to the hardpan, the light gray and very pale brown, mottled clay loam. The moderately slow permeability, and low strength. The next 11 inches is variegated very pale brown and light rare flooding is a hazard. Ripping the hardpan improves yellowish brown, mottled sandy loam. The lower part to permeability and thus also improves the suitability of the a depth of 80 inches is a variegated light gray and light soil for septic tank absorption fields. The moderately yellowish brown, strongly cemented hardpan. The soil is slow permeabillty can be overcome by increasing the calcareous below a depth of 7 inches. In some areas size of the absorption field. Properly designing buildings the surface layer is loam. and roads can offset the limited ability of the soil to Included in this unit are small areas of Guard and support a load. Houses, roads, and streets should be Ryde soils in the slightly lower landscape positions and constructed above expected flood levels. Stockton and Devries soils in the slightly higher This map unit is in capability units Illw-8 (MLRA-17), positions. Also included, in landscape positions similar irrigated, and IVw-8 (MLRA-17), nonirrigated. It is in to those of the Rioblancho soil, are small areas of vegetative soil group G. Columbia soils, moderately fine textured soils that have a hardpan below a depth of 40 inches, and soils that do 227—Rioblancho-Urban land complex, drained, 0 not have a hardpan within a depth of 60 inches. to 2 percent slopes. This nearly level map unit is on Included areas make up about 15 percent of the total basin rims. Elevation is 5 to 25 feet. The average acreage. annual precipitation is about 14 inches, the average Permeability is moderately slow in the Rioblancho annual air temperature is about 60 degrees F, and the soil. Available water capacity is moderate. The effective average frost-free period is about 270 days. rooting depth is limited by the hardpan at a depth of 20 This unit is 50 percent Rioblancho clay loam and 35 to 40 inches. The water table has been lowered to a percent Urban land. The components of this unit occur depth of more than 6 feet through drainage systems as areas so intricately intermingled that it was not that require continual maintenance, but water may be practical to map them separately at the scale used. perched above the hardpan after periods of heavy Included in this unit are small areas of Egbert soils in rainfall or irrigation. Runoff is slow, and the hazard of the slightly lower landscape positions. Also included, in water erosion is slight. The rate of water intake in landscape positions similar to those of the Rioblancho irrigated areas is 0.5 inch per hour. The soil is subject soil, are small areas of Stockton and Jacktone soils and to rare flooding, which occurs during years of small areas of moderately fine textured soils that have a abnormally high precipitation. hardpan below a depth of 40 inches. Included areas Most areas are used for irrigated crops. A few areas make up about 15 percent of the total acreage. are used as irrigated pasture or for homesite The Rioblancho soil is moderately deep to a hardpan development. This unit may provide wetland functions and is somewhat poorly drained. It formed in alluvium and values. These should be considered in plans for derived from mixed rock sources. Mottles in the profile r