PERMFILE109841 - Laserfiche WebLink

Home Browse Search

• avoid overirrigating and leaching of plant nutrients, applications of irriga- tion water should be adjusted to the available water capacity, the water intake rate, and the crop needs. Over irrigation results in a higher water table and the production of only water tolerant plants. If this unit is used for nonirrigated crops, the main limitations are wetness, clayey texture and short growing season. Wetness limits the choice of period for planting and harvesting. Because of the clayey texture, tillage operations should be done when the soil is at the proper moisture content. If this unit is used for homesite development, the main limitations are the high water table, very slow permeability and shrink-swell potential. Septic tank absorption fields do not function properly because of the high water table and very slow permeability. Use of sandy backfill for the trench and long absorption lines helps to compensate for the very slow permeability. 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. The effects of shrinking and swelling can be minimized by using proper engineering designs and by backfill- ing with material that has low shrink-swell potential. This map unit is in capability subclass Vw. 27A--Unnamed sandy loam, 1 to 10 percent slopes. This deep, well drained soil is in narrow alluvial valleys. It formed in alluvium. Elevation is 7,000 to 8,500 feet. The average annual precipitation is about 18 to 25 inches, the average annual air temperature is 37 to 40 degrees F, and the frost-free season is 40 to 60 days. Included in this unit are small areas of a soil similar to this Unnamed soil but is cobbly or stony. Typically, the surface layer is a very dark grayish brown sandy loam about 14 inches thick. The underlying material is grayish brown sandy clay • loam to 60 inches or more. Ex. 16-25