Western Coastal Plain 133B-Western Coastal Plain Arkansas, Louisiana, Oklahoma, and Texas 140,640 sq. Land that is cleared is used mostly for pasture and hay crops. About one-sixth is used for cropland. Common crops grown are corn, grain sorghum, oats, soybeans, peanuts, rice, and vegetable crops. This area is a gently to strongly sloping dissected coastal plain.
Local relief is in meters.
Average annual precipitation - 1,025 to 1,350 mm, increasing from northwest to southeast. Maximum precipitation is in spring and early in summer, and the minimum is late in summer and in autumn. Precipitation, perennial streams, and ground water generally provide an abundance of water. Even though summer rainfall is generally adequate, droughts are common. There is a summer moisture deficit of 50 to 150 mm.