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i 60 Soil SUN( may be very briefly perched above the hardpan after variegated very pale brown and light yellowish browr periods of heavy rainfall or irrigation. Runoff is very weakly cemented to indurated hardpan. In some are. slow, and the hazard of water erosion is slight. The rate the surface layer is clay or silty clay loam. of water intake in irrigated areas is 1.5 inches per hour. Included in this unit are small areas of Archerdale The hazard of soil blowing is slight. The soil is subject Cogna, Hollenbeck, and Vignolo soils in landscape to rare flooding, which occurs during years of positions similar to those of the Finrod soil. Included abnormally high precipitation. areas make up about 15 percent of the total acreagE Most areas are used for irrigated crops or vineyards. Permeability is slaw in the Archerdale soil. Availat A few areas are used for orchards or for homesite water capacity is high. The shrink-swell potential als( development. This unit may provide wetland functions high. The effective rooting depth is limited by the and values. These should be considered in plans for hardpan at a depth of 40 to 60 inches. Depth to the enhancement of wildlife habitat or land use conversion. water table is more than 6 feet, but water may be ve This unit is suited to irrigated row, field, and vineyard briefly perched above the hardpan after periods of crops. The main limitations are depth to the hardpan heavy rainfall or irrigation. Runoff is slow, and the and the low available water capacity. The hardpan limits hazard of water erosion is slight. The rate of water the suitability for deep-rooted plants. Where feasible, intake in irrigated areas is 0.5 inch per hour. The soi deep ripping of this restrictive layer can help to subject to rare flooding, which occurs during years of overcome this limitation. Because the soil is droughty, abnormally high precipitation. applications of irrigation water should be light and Most areas of this unit are used for irrigated crops * frequent. Furrow, border, and sprinkler irrigation orchards. A few areas are used for homesite systems are suitable. Careful applications of irrigation development. water are needed to prevent the buildup of a high water This unit is suited to irrigated row, field, and orcha table. A tillage pan forms easily if the soil is tilled when crops. The main limitations are the slow permeability wet. Chiseling or subsoiling breaks up the pan. and depth to the hardpan. Because of the restricted 9 Returning crop residue to the soil or regularly adding permeability, water applications should be regulated other organic material improves fertility, minimizes that the water does not stand on the surface and crusting, and maintains the rate of water intake. damage the crops. The hardpan limits the suitability If this unit is used for homesite development, the deep-rooted crops. Where feasible, deep ripping of tl main limitation is depth to the hardpan. The rare restrictive layer can help to overcome this limitation. 7 flooding is a hazard. Ripping the hardpan improves Furrow, border, and sprinkler irrigation systems are permeability and thus also improves the suitability of the suitable. Careful applications of irrigation water are soil for septic tank absorption fields. Houses, roads, and needed to prevent the buildup of a high water table. streets should be constructed above expected flood Returning crop residue to the soil or regularly adding levels. other organic material improves fertility, minimizes This map unit is in capability units Ills-8 (MLRA-17), crusting, and increases the rate of water intake. irrigated, and IVs-8 (MLRA-17), nonirrigated. It is in If this unit is used for homesite development, the w. vegetative soil group G. main limitations are the high shrink-swell potential, Ic strength, the slow permeability, and depth to the 158—Finrod clay loam, 0 to 2 percent slopes. This hardpan. The rare flooding is a hazard. Properly + moderately well drained, nearly level soil is on low fan designing foundations and footings and diverting rune terraces. It is deep to a hardpan. It formed in alluvium away from buildings help to prevent the structural derived from mixed rock sources. A few areas are damage caused by shrinking and swelling. Properly dissected by intermittent sloughs that have been filled designing buildings and roads can offset the limited as a result of land leveling. Elevation is 35 to 120 feet. ability of the soil to support a load. On sites for septi( The average annual precipitation is about 14 inches, tank absorption fields, the slow permeability can be the average annual air temperature is about 60 degrees overcome by increasing the size of the absorption fie .' F, and the average frost-free period is about 270 days. Ripping the hardpan improves permeability and thus Typically, the upper 8 inches of the surface layer is also improves the suitability of the soil for septic tank dark brown clay loam. The lower part of the surface absorption fields. Houses, roads, and streets should layer and the upper part of the subsoil are dark brown constructed above expected flood levels. and yellowish brown clay about 25 inches thick. The This map unit is in capability units IIs-8 (MLRA-17; next part of the subsoil is variegated light yellowish irrigated, and IVs-8 (MLRA-17), nonirrigated. It is in brown, brown, and strong brown clay about 15 inches vegetative soil group A. thick. The lower part to a depth of 60 inches is a