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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Groundwater Availability
during Drought Conditions in the Edwards Aquifer, Hays and Travis Counties,
Texas
Hunt, Brian B.1 and Smith, Brian
A.1
ABSTRACT
The Barton Springs segment of the Edwards Aquifer
is an important water resource for municipal, industrial, domestic, recreational,
and ecological needs. Recent studies have given us a better understanding
of the amount of groundwater that will be available during a severe drought
with increased demand. This paper describes the methods used to characterize
and quantify the impacts to water-supply wells during drought-of-record conditions
(e.g., 1950s) and with increasing demand on groundwater. Potentiometric
and saturated thickness maps of the aquifer representing drought conditions
and computer-simulated drawdown from pumping were created. Well productivity
(specific capacity) and construction data were compiled and evaluated with
saturated thickness and potentiometric maps to estimate the number of wells
that could be negatively impacted. Results indicate that the southwestern,
unconfined portion of the aquifer is the most susceptible to decreased saturated
thickness under drought and is further reduced with increased pumping. Up
to 7% of water-supply wells in the District may have yield problems under
drought alone. The combined effects of drought and pumping at an annualized
rate of 10 cubic feet per second, currently permitted by the District, could
result in negative impacts of up to 19% of the total water-supply wells in
the District. Severe drought and high pumping rates will increase the potential
for flow from the saline to fresh-water zone. These studies are a critical
component of the management of the Edwards Aquifer and will be used to set
sustainable yield policies for resource management by the District.
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