Longevity Assessment for City of Bandera Water Wells

Study Summary:

The goals of the study are to (1) evaluate water level decline in the lower Trinity Aquifer in Bandera county, and (2) predict future water levels in the aquifer in this area. The results of this study will be used to evaluate the need for an Aquifer Storage and Recovery (ASR) project(s) to augment the water supply of the lower Trinity Aquifer to meet the growing demand of the city of Bandera and new subdivisions in Bandera County.

The objectives of the study are to:

  • Create a groundwater model of the lower Trinity Aquifer for the study area
    • The new groundwater model will be based on the Hill Country Trinity Groundwater Availability Model (GAM) but modified as follows:
      • change the grid cell size in Bandera county area, from 1-mile to 0.25-mile and
      • update the lower Trinity aquifer pumpage information from 1997 to 2020
      • update the lower Trinity aquifer hydraulic conductivity based on observed and modeled water levels
  • Process the model to predict future water levels based on the city fully utilizing existing groundwater supply volumes from the 2021 Region J Water Plan
  • Process the model to predict future water levels based on 2021 Region J Water Plan available supply until the 2070 decade
  • Prepare and publish study findings in a TWDB report
Study Team Members:
Azzah AlKurdi, Shirley Wade, James Golab, and Andrea Croskrey
Study Start Date:
Winter 2020/2021
Study Completion Date:
Winter 2022/2023
The study will develop data and a report that will be available to researchers and decision-makers to assist in evaluation of future ASR projects.

Study Details


Study Investigators:

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

Azzah AlKurdi

Shirley Wade, Ph.D., P.G.

James Golab, Ph.D., P.G.

Andrea Croskrey, P.G.

Engaged Stakeholders:

Bandera County River Authority and Groundwater District (BCRAGD)
Dave Mauk - General Manager
440 FM 3250 | P.O. Box 177
Bandera, TX 78003

City of Bandera
Rebecca Gibson- Mayor
511 Main Street
P.O. Box 2443
Bandera, TX 78003

Study Milestones

Event Date
Meeting with BCRAGD and City of Bandera, Conference call July 30, 2020
Meeting with BCRAGD and City of Bandera, Microsoft Teams January 15, 2021
Preliminary Results Presentation, Microsoft Teams February 14, 2022
Final results presentation to the Bandera City Council, Bandera City Hall January 17, 2023
Public Webinar, GotoWebinar March 30, 2023


Final Report

Public Webinar