saws' twin oaks aquifer storage and recovery project saws' twin oaks aquifer storage and...
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SAWS' Twin OaksAquifer Storage andRecovery Project
SAWS' Twin OaksAquifer Storage andRecovery Project
October 11 2010October 11 2010October 11 2010October 11 2010
Texas Innovative Water 2010
Roberto MaciasPlant Manager
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
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 Carrizo production only
• 2002 agreement with Evergreen Underground Water District limited Carrizo production to 6,400 af/year
ASRsite
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
PropertiesIncludedin WaterResource andManagementAgreement
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
Project History• Facility online in 2004• Phase I included 17 wells
and 30 mgd water treatment facility
• Phase II (completed 2009) included 12 additional wells to increase storage/recovery capacity to 64 mgd
• Phase IIA included local Carrizo wells– 7 wells for exclusive Carrizo production
• ≈ $250,000,000 invested so far
Twin Oaks treatment facilityTwin Oaks treatment facility
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
Changing Operational Plan
• Carrizo only
• Seasonal benefit
• Long-term storage
• Both seasonal benefit and long-term storage
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
Welllocations
ASR wellASR well
monitoring wellmonitoring well
Carrizo wellCarrizo well
pilot desal wellpilot desal well
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
Welllocations
ASR wellASR well
monitoring wellmonitoring well
Carrizo wellCarrizo well
pilot desal wellpilot desal well
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
Welllocations
ASR wellASR well
monitoring wellmonitoring well
Carrizo wellCarrizo well
pilot desal wellpilot desal well
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
Welllocations
ASR wellASR well
monitoring wellmonitoring well
Carrizo wellCarrizo well
pilot desal wellpilot desal well
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
Current WorkDesalination Pilot Plant
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
0
10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
Jan
-04
Jul-
04
Jan
-05
Jul-
05
Jan
-06
Jul-
06
Jan
-07
Jul-
07
Jan
-08
Jul-
08
Jan
-09
Jul-
09
Jan
-10
Jul-
10
Current storage volume = 81,556 af
acre-feet
cumulative volumein storage
Water in Storage at Twin Oaks2004 to July 20, 2010
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
50,000
75,000
100,000
125,000
150,000
175,000
200,000
225,000
250,000
275,000
300,000
2009 2010 2011 2012 2013 2014 2015 2016 2017
Acre-Feet
Edwards Supply Owned (DS) Edwards Supply Leased (DS) Trinity ProjectLocal Carrizo Western Canyon ASR ProjectPermitted Supply Gaps
Existing Permitted SuppliesDrought of Record Impact Today (circa 2009)
High (126 GPCD)
Normal (116 GPCD)
Low (106 GPCD)
Permitted Supply Gaps
10,436 37,622 23,851
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
ASR and Permitted Supply Gap
0
100,000
200,000
300,000
400,000
2011 2012 2013 2014 2015 2016 2017 2018 2019
acre-feet
Total Supplies
ASR Storagedemand at
116 gpcd
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
USGS activities
• Completed Scientific Investigations Report Quality of Groundwater at and near an Aquifer Storage and Recovery Site, Bexar, Atascosa, and Wilson Counties, Texas, June 2004 - August 2008– "no trends that might have been caused by migration of
injected Edwards aquifer water were observed"• Continued sampling of 15 off-site wells for water quality • 1 ASR monitor well equipped with a water quality monitor• 3-D model pilot study in progress (in next year’s Joint Funding
Agreement). • Will assist in selection of possible new monitoring well site(s)
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
Storage volume by ASR well
MillionGallonsInjected
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
Migration of stored water
From CH2MHill Technical Memorandum, South Bexar County ASR Recovery Assessment, Jan. 7, 2004
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
Mitigation program
• 240 wells investigated• 101 wells where mitigation has been completed:
– 33 wells had pumps lowered– 59 new wells drilled– 9 wells with no mitigation required
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
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
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SAWS' Twin Oaks Aquifer Storage and Recovery Project UpdateSAWS' Twin Oaks Aquifer Storage and Recovery Project Update
Moving forward with ASR
• Maintain bank in long-term storage• Explore effective summer peak management
strategies• Plan for future studies to understand
hydrodynamics of site
SAWS' Twin OaksAquifer Storage andRecovery Project
SAWS' Twin OaksAquifer Storage andRecovery Project
October 11 2010October 11 2010October 11 2010October 11 2010
Texas Innovative Water 2010
Roberto MaciasPlant Manager