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ASR: A Tool in Drought
Management
ASR: A Tool in Drought
Management
August 29, 2012August 29, 2012August 29, 2012August 29, 2012August 29, 2012August 29, 2012August 29, 2012August 29, 2012
Kelley NeumannSenior Vice President of Strategic Resources
Texas Groundwater Summit
Page 2
What is ASR?
• Over 90,000 ac-ft of water stored underground
August 29, 2012
ASR: A Tool in Drought ManagementASR: A Tool in Drought Management
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
• Original project concept was for seasonal storage
•ASR•site
Page 3
ASR: A Tool in Drought ManagementASR: A Tool in Drought Management
August 29, 2012
was for seasonal storage and Carrizo production
• 2002 agreement with Evergreen Underground Water District
Project History• Phase I (completed 2004)
– 17 wells
– 30 mgd water treatment facility
• Phase II (completed 2009) – 12 additional wells
– Increased conveyance capacity to 64 mgd
•Twin Oaks treatment facility•Twin Oaks treatment facility
Page 4
ASR: A Tool in Drought ManagementASR: A Tool in Drought Management
August 29, 2012
capacity to 64 mgd
• Phase IIA (completed 2010)
– 7 additional wells for Carrizo production
• $260,000,000 investment
Changing Operational Plan
• Seasonal benefit versus long-term storage
• Determining when to use
• Using local Carrizo pumping
Page 5
ASR: A Tool in Drought ManagementASR: A Tool in Drought Management
August 29, 2012
• EARIP commitment
Page 6
Twin Oaks ASR StorageJanuary 2004 to August 27, 2012
60,000
80,000
100,000
120,000
acre-
feet
August 29, 2012
ASR: A Tool in Drought ManagementASR: A Tool in Drought Management
0
20,000
40,000
60,000
volume in storage(on August 27)
= 90,176 af
feet
Page 7
ASR and Local Carrizo Volumes2004 to 2012 (2012 is thru 8/27)
Cumulative Maintenance Flows
Production(acre-feet)
801
936
6,389
Year
2004
2005
2006
4302007
Recharge(acre-feet)
5,527
13,491
9,056
20,199
Local Carrizo
Production(acre-feet)
585
0
0
0
Twin Oaks ASR
August 29, 2012
ASR: A Tool in Drought ManagementASR: A Tool in Drought Management
Cumulative Maintenance Flows
2004 to March 20094302007
2008
2009
1,249
1,445
20,199
10,852
17,011
0
214
5,301
2010 1,706 25,533 391
2011 13,224 12,055 6,341
2012 2,974 5,266 2,597
Page 8
Water Management Plan
300,000
400,000
500,000
600,000Drought of Record 2012 – 2020
August 29, 2012
ASR: A Tool in Drought ManagementASR: A Tool in Drought Management
0
100,000
200,000
2012 2013 2014 2015 2016 2017 2018 2019 2020
Current Supplies EARIP Commitment Planned Supplies ASR Supply Dry Demand (143 GPCD)
Page 9
Operational Challenges
• Determining storage capacity
• Recovery capacity
• Migration of the water
• Influence of area irrigation wells
• Water does not recognize property
August 29, 2012
ASR: A Tool in Drought ManagementASR: A Tool in Drought Management
• Water does not recognize property boundaries
• Knowing when to turn it on
Page 10
Migration of Stored Water
August 29, 2012
ASR: A Tool in Drought ManagementASR: A Tool in Drought Management
From CH2MHill Technical Memorandum, South Bexar County ASR Recovery Assessment, Jan. 7, 2004
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
August 29, 2012
ASR: A Tool in Drought ManagementASR: A Tool in Drought Management
on overall water supply plan
• Ideal application for managing through droughts
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
August 29, 2012
ASR: A Tool in Drought ManagementASR: A Tool in Drought Management
• Reasonable DFCs and longer-term permits
• Ensuring protection of ASR projects
• Distinct and favorable rules and regulations for the development of brackish groundwater
ASR: A Tool in Drought
Management
ASR: A Tool in Drought
Management
August 29, 2012August 29, 2012August 29, 2012August 29, 2012August 29, 2012August 29, 2012August 29, 2012August 29, 2012
Kelley NeumannSenior Vice President of Strategic Resources
Texas Groundwater Summit
Page 14
Well
Locations
August 29, 2012
ASR: A Tool in Drought ManagementASR: A Tool in Drought Management
ASR wellASR well
monitoring wellmonitoring well
Carrizo wellCarrizo well
Page 15
Well
Locations
August 29, 2012
ASR: A Tool in Drought ManagementASR: A Tool in Drought Management
ASR wellASR well
monitoring wellmonitoring well
Carrizo wellCarrizo well
Page 16
Well
Locations
August 29, 2012
ASR: A Tool in Drought ManagementASR: A Tool in Drought Management
ASR wellASR well
monitoring wellmonitoring well
Carrizo wellCarrizo well
