February 2022 TAGD Business Meeting Texas Water Development Board Updates Natalie Ballew, Groundwater Technical Assistance Manager Heather Dodson, Groundwater Data Team Lead

1. Texas Water
Development Board
Updates
TAGD Business Meeting
February 9, 2022

2. new Program Managers
Alysa Suydam
BRACS Manager
alysa.suydam@twdb.texas.gov
Daryn Hardwick
Groundwater Modeling Manager
daryn.hardwick@twdb.texas.gov

3. Groundwater
Studies

4. South Llano
River Watershed
Study
4 of 6 surface water
measurement sites installed
1 of 1 Texmesonet station
operating
3 of 8 wells equipped and
operating
Data coming in now!

5. The ‘Maverick’
Aquifer
Working with BEG, RRC,
and TWRI to coordinate
data collection and
analysis
Will consider potential
aquifer designation
based on findings (with
GCD involvement)
www.twdb.texas.gov/groundwater/special_projects/
maverick/index.asp

6. Management Plan
GAM Runs

7. Changes In management plan
GAM Runs
Management Plan requirement Aquifer or confining unit Results
Estimated annual amount of recharge from precipitation to the
district
Official Aquifer 2,873
Estimated annual volume of water that discharges from the
aquifer to springs and any surface water body including lakes,
streams, and rivers
Official Aquifer 1,486
Estimated annual volume of flow into the district within each
aquifer in the district
Official Aquifer 4,995
Estimated annual volume of flow out of the district within each
aquifer in the district
Official Aquifer 2,999
Estimated net annual volume of flow between each aquifer in the
district
To the Official Aquifer from
overlying Younger Units
1,451
To the Official Aquifer from
equivalent hydrogeologic units
outside the official aquifer
boundary
3,702
From the Official Aquifer to
underlying Older Units
2,522

8. New!
In management plan GAM Runs
Older Units
Younger Units
Equivalent
hydrogeologic
units outside
the official
aquifer within
the District
Official Aquifer
outside District
2,873
2,999
Recharge
from
precipitation
springs &
surface
water
1,486
4,995 3,702
1,451
2,522
Caveat: This diagram only includes the water budget items provided in Table #. A complete water budget would include additional
inflows and outflows. If the District requires values for additional water budget items, please contact TWDB.

9. Idea! Full water budgets

10. Thoughts? Full water budgets
Let us know what you think!
Take this like it/don’t
like it survey
Send thoughts, concerns,
or questions to
Grayson Dowlearn
grayson.dowlearn@twdb.texas.gov
Survey Link

11. Recorder Well
Program

12. Recorder Well
Program
Adding sites to counties
without recorders
*Unequipped
*No pumping influence
Expanding or starting a
recorder well network?
Let us know, we can help!
Contact Andrew Weinberg
andrew.weinberg@twdb.texas.gov

13. TWDB Groundwater
Data

14. NEW Webpage!
Submitting Data to the
TWDB
www.twdb.texas.gov
/groundwater/data/
submitdata.asp

15. Tips for Submitting
Data
Every site needs a unique
state well number
*Even if they look the same,
they get a unique name
Include required fields
Notes and comments are
very helpful

16. Improving GCD/TWDB
Communication
Join TWDB staff during field
work
Groundwater 101 presentations
Keep in touch! We love hearing
from you
How can we improve?
* Contact us at 512-936-0847 or
groundwaterdata@twdb.texas.gov

17. Natalie Ballew
Groundwater Technical Assistance
natalie.ballew@twdb.texas.gov
512-463-2779
Heather Dodson
Groundwater Data Team
heather.dodson@twdb.texas.gov
512-936-0847

18. Bonus updates
Groundwater models (GAM)
Bracs
Aquifer Storage & Recovery
Desalination

19. New models in progress with estimated completion year:
Blossom Aquifer – model complete, mailout in the works
Marathon Aquifer conceptual model – mid 2022
Southern Carrizo-Wilcox, Queen City, and Sparta aquifers – mid
2022
Southern/Central Gulf Coast Aquifer – mid 2022
Northern Edwards (BFZ) and Trinity aquifers – mid 2022
Southern portion of the Trinity Aquifer (aka, Trinity Hill Country
Aquifer) – 2023
Edwards-Trinity (Plateau), Trinity (Hill Country), and Pecos
Valley aquifers – 2023
Nacatoch Aquifer – just started, estimated completion year TBD
GAM Updates

20. GAM research projects with estimated completion year:
Pumping study in the Edwards-Trinity (Plateau) region – under
final review
Recharge and groundwater-surface water interaction study in
the Edwards-Trinity (Plateau) region – early 2022
GAM Updates

21. Southern portion of the Trinity Aquifer (aka Hill Country portion of
the Trinity Aquifer) – report in final review; TWDB presentations of
draft results presented at GeoGulf 2021 are available on BRACS
website
Edwards-Trinity (Plateau) Aquifer – underway; expanding study
area to include the ‘Maverick’ Aquifer
Upper Coastal Plains East aquifers (Carrizo-Wilcox, Queen City,
Sparta, and Yegua-Jackson aquifers) – underway
Woodbine Aquifer – early stages
BRACS Updates

22. Brackish Groundwater
Comingling
Seismic Interpretation
Data Entry for Upper Coastal
Plain East Aquifers
Core Testing for Hill Country
Trinity Aquifer
Drilling and logging ideal well
BRACS Research
Studies
Develop Procedures and Tools to
Delineate Areas Designated or
Used for Class II Well
Wastewater Injectate
Sampling of Higher Salinity
Groundwater
Core Testing and Numerical Well
Simulations for Edwards-Trinity
(Plateau) Aquifer
Data and reports available

23. Carrizo-Wilcox Aquifer Characterization for Eastern
Gonzales and parts of Caldwell and Guadalupe
Counties, Texas
*will develop data and a report to aid GBRA’s development of the
ASR component of their Mid-Basin Water Supply Project.
Longevity Assessment for City of Bandera Water Wells
*using MODFLOW to develop data and a report to aid in the
evaluation of the necessity and timeline for the city’s planned ASR
project.
Aquifer Storage &
Recovery Studies

24. 53 municipal desalination facilities
Total desalination capacity of 157 million gallons per day
(176,013 acre-feet per year)
36 facilities use brackish groundwater as a raw water
source, accounting for a design capacity of
approximately 90 million gallons per day (100,769 acre-
feet per year)
Desalination plant
database