Hill Country Trinity aquifer: Structure and Brackish Groundwater

Report Summary: Brackish Groundwater in the Southern Portion of the Trinity Aquifer (Hill Country Trinity)

Full Report: Brackish Groundwater in the Hill Country Trinity Aquifer and Trinity Group Formations, Texas

Study Summary:

The goals of the study are to (1) map and characterize the brackish parts of the Hill Country Trinity aquifer in greater detail using existing water well reports, geophysical well logs, and available aquifer data and (2) build datasets that can be used for groundwater exploration and replicable numerical groundwater models to estimate the volumes of groundwater in as many as five salinity classes.

The objectives of the study are to:

collect, analyze, and interpret thousands of water well and geophysical well logs;
map the geological boundaries of the Hill Country Trinity aquifer;
map the distribution of total dissolved solids in the aquifer;
map the distribution of key chemical parameters of interest to desalination;
map the water bearing lithologic units in the aquifer;
estimate the volume of fresh and brackish water in the aquifers;
incorporate all information into the publicly available database and GIS datasets;
present study findings in a peer-reviewed TWDB report.

Study Manager:: Mark Robinson
Study Start Date:: April 2019
Study Completion Date:: Summer 2022
Benefits:: The team anticipates that the publicly available data and report produced by this study will aid researchers and decision-makers in the selection or elimination of locations for site specific studies on groundwater desalination and aquifer storage and recovery. As stipulated by the 84th Texas Legislature in House Bill 30, it will also enable the process of evaluating the Hill Country Trinity aquifer for the designation of brackish groundwater production zones.

Study Details

Study Area Map
Participants
Stakeholder Meetings
Presentations
Contracted Report
Final Report

Participants

Study Investigators:

Texas Water Development Board
1700 N. Congress Avenue
Austin, TX 78711

Mark Robinson, P.G.
Mark.Robinson@twdb.texas.gov
512-463-7657

Engaged Stakeholders:

This list is not yet available.

Stakeholder Meetings

Event	Date
Presentation on data collection efforts at the Groundwater Management Area 9 Meeting at the Bee Cave City Hall, located at 4000 Galleria Parkway, Bee Cave, Texas 78738	Monday, April 22, 2019 at 10:00 a.m.
Presentation on data collection efforts at the Groundwater Management Area 13 Meeting at the Evergreen Underground Water Conservation District, located at 110 Wyoming Blvd., Pleasanton, Texas 78064	Friday, May 3, 2019 at 10:00 a.m.
Presentation on data collection efforts at the Plateau (Region J) Regional Water Planning Meeting at the Frio Canyon Baptist Church, located at 919 US-83, Leakey, Texas 7887	May 15, 2019 at 10:00 a.m.
Presentation on data collection efforts at the Lower Colorado (Region K) Regional Water Planning Meeting at the Lower Colorado River Authority Dalchau Service Center, located at 3505 Montopolis Drive, Austin, Texas 78744	July 10, 2019 at 10:00 a.m.
Presentation on data collection efforts at the Groundwater Management Area 10 Meeting at the Edwards Aquifer Authority, located at 900 E Quincy Street, San Antonio, Texas 78215	December 2, 2019 at 10:00 a.m.