Houston Black soils are on adjoining higher upland positions. Lewisville soils are in the fine-silty family. Tinn soils are moist in the moisture control section for longer periods, and are in slightly lower flood plain positions. Moderately well drained. Runoff is low on slopes less than 1 percent and medium on 1 to 3 percent slopes.
Permeability is very slow.
Water enters the soil rapidly when it is dry and cracked and very slowly when it is moist. Nearly all is cropped to cotton, sorghums, corn, oats, and wheat. Native vegetation consists of little and big bluestems, indiangrass, switchgrass, sideoats grama, with scattered elm, bois'd'arc, and hackberry trees. Mesquite is an invader in most areas. The series is extensive.