Approximate potentiometric surfaces for the aquifers of the Texas coastal uplands system, 1980

The National Water Commission recommended that the U.S. Geological Survey conduct intensive studies of the important regional aquifer systems in the United States, particularly those with declining water levels and deteriorating water quality.  The result has been a series of Regional Aquifer-System Analysis (RASA) studies, one of which is the West Gulf Coast RASA study (Grubb, 1984).  The West Gulf Coast RASA study, which began in 1982, is investigating several major regional aquifers mainly in parts of Missouri, Kentucky, and Tennessee.