APPROACHES TO MONITORING AND REGULATION OF AN AQUIFER STORAGE AND RECOVERY SYSTEM IN THE EDWARDS AQUIFER, SOUTH-CENTRAL TEXAS, USA Jennifer R. Adkins Schudrowitz, Alyssa B. Balzen , F. Paul Bertetti AbstractThe Edwards (Balcones Fault Zone) Aquifer (Edwards BFZA) is a major karstic limestone aquifer in south-central Texas, USA. The aquifer serves as the primary water supply for approximately 2.5 million people and is integral to the ecosystems of major springs that are home to several threatened and endangered species.