SIMULATION OF THE FLOW SYSTEM OF BARTON SPRINGS AND ASSOCIATED EDWARDS AQUIFER IN THE AUSTIN AREA, TEXAS
- Permanent Link:
- SIMULATION OF THE FLOW SYSTEM OF BARTON SPRINGS AND ASSOCIATED EDWARDS AQUIFER IN THE AUSTIN AREA, TEXAS
- Series Title:
- M. Slade, Raymond
- Publication Date:
- Subjects / Keywords:
- Barton Springs ( local )
Ground-Water ( local )
Austin, Texas ( local )
- serial ( sobekcm )
- A digital model of two-dimensional ground-water flow was used to estimate
the hydraulic properties of the Edwards aquifer in a 151-square-mile area near
Austin, Texas. The transmissivity, hydraulic conductivity, and specific yield
were estimated for the part of the aquifer that discharges at Barton Springs in
Austin. The aquifer is composed of the Edwards and overlying Georgetown Limestones of Cretaceous age and ranges in thickness from about 100 to about 450
More than 60 years of discharge measurements and 5 years of gaged discharge
for Barton Springs were used to adjust springflow for the simulations. Barton
Springs accounts for about 96 percent of springflow from the study area and 90
percent of the total discharge. The remaining discharge was pumpage from wells
which was entered in the model. Four years of gaged recharge were used in the
simulations. The potentiometric surfaces used by the models were constructed
from water-level measurements in as many as 75 wells.
The transmissivity was calibrated through steady-state simulations that
used the mean value of recharge and mean potentiometric surface to represent
average conditions for the aquifer. The transmissivities vary from about 100
feet squared per day in the western part of the aquifer to more than 1 million
feet squared per day near Barton Springs. Specific yield was calibrated through
transient-state simulations for 5 consecutive months using time-dependent data
for recharge, discharge, and water levels. The mean specific yield for the
aquifer is 0.014 and ranges from 0.008 to 0.064. Additional aquifer properties
used in the simulations include storage coefficient, altitudes of the base and
top of the aquifer, and hydraulic conductivity.
A simulation for the year 2000 using projected pumping rates for municipal, industrial, agricultural, and domestic supplies indicates that the aquifer
would be dewatered in the southwestern part of the study area and have large
declines in the southeastern part of the study area. Another simulation of
- Original Version:
- USGS, Vol. 85-4299 (1985-01-01).
- Source Institution:
- University of South Florida Library
- Holding Location:
- University of South Florida
- Rights Management:
- This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.
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