Alternative Title

BSEACD Report of Investigations 2007-1201



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Publication Date

January 2007


ABSTRACT Potentiometric maps for the karstic Barton Springs segment of the Edwards Aquifer (Barton Springs aquifer) were constructed using data from high, below average, and low flow conditions. These synoptic potentiometric maps document varying hydrologic conditions and stresses and contain a dense set of data (n= 166 to 231) for this relatively small portion of the Edwards Aquifer (155 sq. mi.), allowing detailed examination of hydrogeologic features and phenomena. Results indicate steep gradients within the extremely dynamic aquifer system, with water-level changes from 20 to 100 feet over large portions of the area. Troughs and ridges in the potentiometric surfaces correspond to preferential flow paths (conduits) with contours significantly changing morphology from one aquifer condition to the next. Influence of discrete and diffuse recharge and discrete discharge (pumping) are evident on the potentiometric surfaces. Potentiometric surfaces for these different conditions provide some insight into the dynamic nature of the southern boundary of the aquifer, and the potential for flow from other sources such as the Trinity Aquifer and saline zone of the Edwards. These maps, and associated data sets, are important for calibrations of numerical models and evaluations of sustainable yield. Potentiometric maps are a significant tool for hydrogeologic characterization of the karst flow system in the aquifer, and when combined with dye tracing and other studies, better characterize the dynamic nature of this system. CONTENTS 5. Abstract 5. Introduction 6. Background 10. Potentiometric Maps 13. Methods 14. Results 38. Discussion 40. Conclusions 41. References 46. Appendix Appendix A: A-1: 1950s Drought of record A-2: July and August 1999 Average Flow A-3: June and July 2001 High Flow A-4: February 2002 High Flow A-5: November 2002 High Flow Potentiometric Map of Southern Groundwater Divide area A-6: October and November 2005 Below Average A-7: July and August 2006 Low Flow A-8: Trinity Potentiometric Data Open Access - Permission by Publisher See Extended description for more information.


United States, Geology









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