Permeability is moderate in the upper part of the solum and very slow in the fragipan. Depth to an intermittent perched high water table is at 1.5 to 3.5 feet from January through April in most years. Many areas of Ava soils are cultivated. Corn, soybeans, small grain, and pasture are the main crops. Some areas are in woodland.
Native vegetation is deciduous trees.
Washington County, Illinois, 1927. Horizon designations have been adjusted to reflect this thinking. Data for several pedons are on file at the Illinois state office. Engineering test data for the typical pedon is published in the Soil Survey of Edwards and Richland Counties, Illinois.