Elevation ranges from 25 to 150 feet. The Thornthwaite P-E index is 68 to 80. These are the Kirbyville and Otanya soils. Kirbyville soils are moderately well drained and are on lower landscape positions. Otanya soils have a subsoil yellower than 5YR and are on similar to lower landscape positions.
Silsbee soils are well drained.
Runoff is low on 3 to 5 percent, and medium on 5 to 12 percent slopes. Permeability is moderate. Some areas are used for pastureland. Pastures are bahiagrass and improved bermudagrass. Native vegetation is longleaf pine, yaupon, bluestems, panicums and paspalums.