Hunting leases for deer, quail, and wild turkey are an important source of income in the area. The major concern of management is controlling woody brush that encroaches on the grassland. Only a few large, through-flowing streams have significant flood plains. Relief is mainly in meters, but the large valleys are tens of meters below the adjacent uplands. Average annual precipitation -550 to 750 mm.
Maximum precipitation is in spring and in fall.
Summer moisture deficit ranges from 200 to 275 mm. The moderate but somewhat erratic rainfall is the source of water for crops and range. Summer droughts are common. The larger rivers, such as the Brazos and Colorado Rivers, flow most of the year, but local streams flow intermittently. There are several large lakes and numerous flood-detention, reservoirs in the area.