overview of edwards aquifer authority operations in nueces ... · 4/21/2010 · eaa operations in...
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Nueces Basin and Bay Area Stakeholders Committee
April 21, 2010
Overview of Edwards Aquifer Authority Operations in Nueces Basin
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Topics of Discussion
• EAA purpose and boundary• EAA activities in Nueces Basin• Impacts on Instream Flows in Nueces
Basin
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Edwards Aquifer = San Antonio Segment of the Balcones Fault Zone Edwards Aquifer
A
B
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Generalized Edwards Aquifer Cross Section
A B
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EAA Operations in Nueces Basin
• Regulatory programs – quantity and quality• Data collection – quantity, quality, rainfall• Current research projects:
– Flowpath studies:• Alluvial underflow• Tracer testing in Kinney County• COE Nueces Basin Feasibility Study – HSPF• Recharge and recirculation – Phase III/IV
complete• Cloud Seeding – Uvalde, Medina, Bandera Co.
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EAA Operations in Nueces Basin (contd.)
• Range management cost share• Existing recharge dams in Nueces Basin (three):
– Seco Creek– Parkers Creek– Middle Verde Creek
• Planning/oversight Groups– SCTWAC– State water planning process - Region L– Edwards Aquifer RIP – Recharge Subcommittee
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Existing EAA-operated structures
• Authority operated structures:– All in Medina County
• Parkers Creek Dam – built 1974• Middle Verde Creek Dam – built 1978• San Geronimo Creek Dam – built 1979• Seco Creek Dam/Channel – built 1982
– Authority has surface water diversion permits for the four structures
– Authority also has Class V injection well permits for the Verde and Seco creek structures
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San Geronimo Creek Dam
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Middle Verde Creek Dam
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Parkers Creek Dam
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Seco Channel
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South Central Texas Regional Water Planning Process – Region L
• – 1998 to present– 2001 and 2006 versions for Region L Plan
• 2001 version had more recharge scenarios than 2006 version
• 2006 version primarily contains Trans- Texas management scenario (L-18)
• Draft 2011 plan – recharge scenarios identical/very similar to 2006 plan
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Definition Number 1 Types of Recharge Structures:
TYPE 2
NORTH SOUTH
Recharge Area
Hold for directinfiltration
TYPE 1Catchment Area
Hold for ReleaseEdwards
LimestoneEngineeredStructure
EngineeredStructure
Balcones Fault Zone
Glen Rose Formation
Confining Beds
Glen Rose Formation
Edwards Limestone
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Commonly Analyzed Recharge Sites
SanAntonio
Hays
Comal
Bexar
MedinaUvaldeKinney
UpperBlanco
UpperVerde
UpperHondoUpper
SabinalUpperDry Frio
Montell Concan
CiboloDam No. 1
LowerVerdeLower
Hondo
Indian CreekLower
Sabinal
LowerBlanco
LowerFrio
SanGeronimo
LEGEND
Type 1 ProjectType 2 ProjectEdwards Aquifer Recharge ZoneSaline Water Line
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Recharge Enhancement Studies (contd.)
• 2006 Region L Plan (contd.)– Contains recharge programs 2A, 2B, and
2C– Program 2A has the most scenarios,
includes the 2B and 2C scenarios, plus others
– Section 4C.20 of plan recommends:• Implement Program 2C by 2020• Expand to Program 2A by 2060
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Recharge Enhancement Studies (contd.)
• 2006 Region L Plan (contd.)– Program 2A
• Indian Creek (with diversion to Dry Frio)• Lower Frio, Sabinal, Hondo, Verde• Lower Blanco, Cibolo #1, Dry Comal• San Geronimo (Upper San Geronimo)• Northern Bexar and northern Medina counties• Salado Creek FRS modifications
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Recharge Enhancement Studies (contd.)
• 2006 Region L Plan (contd.)– Program 2A (contd.)
• Northern Bexar and Northern Medina counties (small Type 2 structures)
–Limkiln–Culebra–Deep Creek–Salado Dam No. 3–Government Canyon
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Impacts on Instream Flow
• Impacts on lower Nueces Basin are minimal, pluses and minuses, qualitative estimates at this time
• Some activities enhance and some diminish flows
• Mitigation (if needed) is envisioned in all project concepts
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Overview of EAA Nueces Basin Activities
END of SLIDES
John Hoyt, P.G.Edwards Aquifer Authoritywww.edwardsaquifer.org