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! RM 2 of 2 If this unit is used for irrigated row, field , and orchard crops , the main limitations are a high water table and slow permeability . Furrow, border , corrugation , and sprinkler irrigation systems are suited to this soil . Because of the slow permeability of this soil , the length of runs should be adjusted to permit adequate infiltration of water . The application of water should be regulated so that water does not stand on the surface and damage the crops . A cropping system that includes crop rotation or a cover crop , use of crop residue and proper tillage improves soil ti | th and increases fertility and water infiltration . If this unit is used for dry | and grain crops , the main limitation is low rainfall during the growing season . Because precipitation is not sufficient for annual cropping , a cropping system that includes small grain and summer fallow is most suitable . Crops respond to nitrogen and phosphorus fertilizer . If this unit is used for homesite development , the main limitations are slow permeability, high shrink-swell , and low strength . If the soil is used for septic tank absorption fields , the limitation of slow permeability can be overcome by increasing the size of the absorption field . If the density of housing is moderate to high , community sewage systems are needed to prevent contamination of water supplies as a result of seepage from on-site sewage disposal systems . If buildings are constructed on this soil , properly designing foundations and footings and diverting runoff away from buildings help to prevent structural damage because of shrinking and swelling . Buildings and roads should be designed to offset the limited ability of the soil in this unit to support a load . The map unit is in capability units IIs-3 ( 17) , irrigated , and IVs-3 ( 17) , non- irrigated . 9/18/8T