1. ASR: A Tool in Drought
Management
August 29, 2012
Texas Groundwater Summit
Kelley Neumann
Senior Vice President of Strategic
Resources

2. Page 2
What is ASR?
• Over 90,000 ac-ft of water stored
underground
August 29, 2012
ASR: A Tool in Drought Management

3. Page 3
Project History
• Part of SAWS' 50-Year Water
Supply Plan, adopted in 1998
• 3,200 acres purchased in south
Bexar, Atascosa, and Wilson
counties in 2000 and 2001 •ASR
•site
• Original project concept
was for seasonal storage
and Carrizo production
• 2002 agreement with
Evergreen Underground
Water District
August 29, 2012
ASR: A Tool in Drought Management

4. Page 4
Project History
•Twin Oaks treatment facility
• Phase I (completed 2004)
– 17 wells
– 30 mgd water treatment facility
• Phase II (completed 2009)
– 12 additional wells
– Increased conveyance
capacity to 64 mgd
• Phase IIA (completed 2010)
– 7 additional wells for Carrizo production
• $260,000,000 investment
August 29, 2012
ASR: A Tool in Drought Management

5. Page 5
Changing Operational Plan
• Seasonal benefit versus long-term
storage
• Determining when to use
• Using local Carrizo pumping
• EARIP commitment
August 29, 2012
ASR: A Tool in Drought Management

6. Page 6
Twin Oaks ASR Storage
January 2004 to August 27, 2012
120,000
100,000
80,000
acre-
feet 60,000
40,000
volume in storage
(on August 27)
20,000 = 90,176 af
0
August 29, 2012
ASR: A Tool in Drought Management

7. Page 7
ASR and Local Carrizo Volumes
2004 to 2012 (2012 is thru 8/27)
Twin Oaks ASR Local Carrizo
Year Production Recharge Production
(acre-feet)
(acre-feet) (acre-feet)
2004 801 5,527 585
2005 936 13,491 0
2006 6,389 9,056 0
2007 430 Cumulative Maintenance Flows
20,199 0
2004 to March 2009
2008 1,249 10,852 214
2009 1,445 17,011 5,301
2010 1,706 25,533 391
2011 13,224 12,055 6,341
2012 2,974 5,266 2,597
August 29, 2012
ASR: A Tool in Drought Management

8. Page 8
Water Management Plan
Drought of Record 2012 – 2020
600,000
500,000
400,000
300,000
200,000
100,000
0
2012 2013 2014 2015 2016 2017 2018 2019 2020
Current Supplies EARIP Commitment Planned Supplies ASR Supply Dry Demand (143 GPCD)
August 29, 2012
ASR: A Tool in Drought Management

9. Page 9
Operational Challenges
• Determining storage capacity
• Recovery capacity
• Migration of the water
• Influence of area irrigation wells
• Water does not recognize property
boundaries
• Knowing when to turn it on
August 29, 2012
ASR: A Tool in Drought Management

10. Page 10
Migration of Stored Water
From CH2MHill Technical Memorandum, South Bexar County ASR Recovery Assessment, Jan. 7, 2004
August 29, 2012
ASR: A Tool in Drought Management

11. Page 11
ASR Highlights
• Project has exceeded all expectations
• Water quality does not degrade
• Amount of water available for storage
and withdrawal has significant impacts
on overall water supply plan
• Ideal application for managing through
droughts
August 29, 2012
ASR: A Tool in Drought Management

12. Page 12
Policy/Legislative Considerations
in Developing New Supply
Regulatory Environment
– Long-term stability is key to development of
new and alternative water sources
• Reasonable DFCs and longer-term permits
• Ensuring protection of ASR projects
• Distinct and favorable rules and regulations for the
development of brackish groundwater
August 29, 2012
ASR: A Tool in Drought Management

13. ASR: A Tool in Drought
Management
August 29, 2012
Texas Groundwater Summit
Kelley Neumann
Senior Vice President of Strategic
Resources

14. Page 14
Well
Locations
ASR well
monitoring well
Carrizo well
August 29, 2012
ASR: A Tool in Drought Management

15. Page 15
Well
Locations
ASR well
monitoring well
Carrizo well
August 29, 2012
ASR: A Tool in Drought Management

16. Page 16
Well
Locations
ASR well
monitoring well
Carrizo well
August 29, 2012
ASR: A Tool in Drought Management