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The Edwards-Trinity
aquifer system underlies about 42,000 square miles of west-central Texas,
where mostly gently dipping Lower Cretaceous strata comprise three regional
aquifers and two regional confining units. The aquifers are the Edwards
Aquifer of the Balcones fault zone, the Trinity Aquifer of the Balcones fault
zone and Hill County, and the Edwards-Trinity Aquifer of the Edwards Plateau
and Trans-Pecos. The Navarro-Del Rio confining unit confines the downdip part of the Edwards Aquifer, and the Hammett
confining unit confines the updip, basal part of the
Trinity Aquifer and a small southeastern fringe of the Edwards-Trinity
Aquifer. Transmissivity averages less than 10,000 feet squared per day
throughout more than 90 percent of the study area as the result of widespread
cementation and secondary mineral growth. However, in fractured and leached
rocks in the Balcones fault zone, transmissivity averages about 750,000 feet
squared per day in the Edwards aquifer, which occupies less than 10 percent of
the area.
Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Hydrogeological framework of the Edwards-Trinity aquifer
system, west-central Texas
Series title:
Professional Paper
Series number:
1421
Chapter:
B
Year Published:
1996
Language:
English
Publisher:
U.S. Government Printing Office
Description:
Report: vii, 61 p.; 8 Plates: 41.96 x 26.00
inches or smaller
Country:
United States
State:
Texas