The Navan series consists of deep, poorly drained soils formed in loamy and clayey deposits in glacial lake basins and on low stream terraces. Slopes range from 0 to 3 percent.
Permeability is slow or moderately slow.
Mean annual temperature is about 48 degrees F, and mean annual precipitation is about 32 inches. Navan silt loam - on a slope of less than 1 percent in a cultivated field at an elevation of about 775 feet. The solum thickness ranges from 20 to 42 inches. The loamy upper part of the solum commonly is 24 to 36 inches thick, but ranges from 18 to 36 inches thick. This corresponds closely to the depth to free carbonates.