Skip to Main Content
Book Chapter

Barton Springs segment of the Edwards (Balcones Fault Zone) Aquifer, central Texas

By
Brian B. Hunt
Brian B. Hunt
Barton Springs/Edwards Aquifer Conservation District, Austin, Texas 78748, USA
Search for other works by this author on:
;
Brian A. Smith
Brian A. Smith
Barton Springs/Edwards Aquifer Conservation District, Austin, Texas 78748, USA
Search for other works by this author on:
;
Nico M. Hauwert
Nico M. Hauwert
Balcones Canyonland Preserve, City of Austin, Austin Water, Wildland Conservation Division, Austin, Texas 78738, USA
Search for other works by this author on:
Publication history
12 February 201904 April 2019
Open Access. Gold Open Access: This chapter is published under the terms of the CC-BY license.

ABSTRACT

The Barton Springs segment of the Edwards (Balcones Fault Zone) Aquifer is a prolific karst aquifer system containing the fourth largest spring in Texas, Barton Springs. The Barton Springs segment of the Edwards Aquifer supplies drinking water for ~60,000 people, provides habitat for federally listed endangered salamanders, and sustains the iconic recreational Barton Springs pool. The aquifer is composed of Lower Cretaceous carbonate strata with porosity and permeability controlled by depositional facies, diagenesis, structure, and karstification creating a triple permeability system (matrix, fractures, and conduits). Groundwater flow is rapid within an integrated network of conduits discharging at the springs. Upgradient watersheds provide runoff to the recharge zone, and the majority of recharge occurs in the streams crossing the recharge zone. The remainder is direct recharge from precipitation and other minor sources (inflows from Trinity Group aquifers, the San Antonio segment, the bad-water zone, and anthropogenic sources). The long-term estimated mean water budget is 68 ft3/s (1.93 m3/s). The Barton Springs/Edwards Aquifer Conservation District developed rules to preserve groundwater supplies and maximize spring flow rates by preserving at least 6.5 ft3/s (0.18 m3/s) of spring flow during extreme drought. A paradox of the Barton Springs segment of the Edwards Aquifer is that rapid recharge allows the Barton Springs segment of the aquifer to be sustainable long term, but the aquifer is vulnerable and limited in droughts. The karstic nature of the aquifer makes the Barton Springs segment vulnerable to a variety of natural and anthropogenic contaminants. Future challenges will include maintaining the sustainability of the aquifer, considering climate change, population growth, and related land-use changes.

Figures & Tables

Contents

GSA Memoirs

The Edwards Aquifer: The Past, Present, and Future of a Vital Water Resource
CONTAINS OPEN ACCESS

Geological Society of America
Volume
215
ISBN electronic:
9780813782157

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal