Groundwater Availability Model for the southern portion of the Gulf Coast Aquifer System, GMA 16 (Chowdhury & Mace 2007, TWDB Report 368). Developed using the U.S. Geological Survey code MODFLOW-96. Superseded by the combined central+southern GAM, retained here for historical reference. TWDB no longer distributes a standalone southern-only model archive for this GAM; it has been folded into the combined Central and Southern Gulf Coast GAM (see gulf-coast-central-southern-gam). Only the historical TWDB Report 368 (2007) documents this superseded standalone model.