Controlling brush encroachment has been a problem for livestock producers utilizing native rangelands in the Southwestern United States for most of the 20th century (Scifres et al.). Increased returns from improved animal performance are usually too low for brush control to be economically feasible (McBryde, Conner, and Scifres; Whitson and Scifres; Upper Colorado River Authority; Dugas, Hicks, and Wright; Thurow and Hester).
In addition to increasing animal performance, brush control may increase off-site water yields via increases in surface run-off and percolation to underground aquifers (Meiman and Dils; Hibbert; Blackburn 1983, 1985; Upper Colorado River Authority; Whitson and Scifres). Ranchers, however, cannot fully capture the benefits associated with increased off-site water yields. Further, good estimates of these benefits have not been developed. In 1985, the Texas Legislature cited the relationship between reducing brush and increasing water yields as a rationale for passing the Texas Brush-Control Act to encourage brush control on private ranches (Texas State Legislature).