Desired Future Condition (DFC) Presentation

H
Cypress Creek Project and the
  Desired Future Conditions
           Process


       Negotiating the Bumps at the
              Intersection of Science
                     and Public Policy

     Douglas A. Wierman, P.G., Hays Trinity GCD
                  October 1, 2009
Alphabet Soup
• GMA – Groundwater Management Area
• GCD – Groundwater Conservation District
• DFC – Desired Future Condition
• MAG – Managed Available Groundwater
• GAM – Groundwater Availability Model
• TWDB – Texas Water Development Board
• DOR – Drought of Record
Outline of Today’s Presentation

• Overview of the DFC Process
• Hydrogeology of Jacob’s Well and Cypress
  Creek

• Status of GMA #9 DFCs and MAGs
• Possible DFC/MAG Implementation Strategies in
  HTGCD
Overview of the DFC Process
• In September, 2005, House Bill 1763 of the 79th
  Texas legislature became effective. HB 1763
  was incorporated into Chapter 36 of the Texas
  Water Code. No funding made available.

• Groundwater planning was regionalized into
  Groundwater Management Areas (GMAs) which
  consist of individual GCDs and areas not
  included in a GCD.

• With significant public input, GMAs must
  establish a Desired Future Conditions for each
  aquifer in the GMA for the period 2010 through
  2060 by September 2010.
Overview of the DFC Process

• TWDB, primarily through the use of groundwater
  availability models, determines how much water
  can be pumped from the aquifer to achieve the
  DFC. This volume of water is known as the
  Managed Available Groundwater, or MAG.

• With public input, individual GCDs must develop
  management strategies and rules to permit
  groundwater withdrawal up to the MAG.
Desired Future Conditions
• A quantitative description of a natural aquifer
  condition/property as a goal – not well
  discharges

• DFCs are set for all aquifers in a GMA
• Aquifer may be subdivided “geographically”
• Approved by vote of two thirds of at least two-
  thirds of the GMA’s GCDs (In GMA #9, as few as
  4 of 9 GCDs can determine DFCs for the entire
  GMA)
Managed Available Groundwater

• Managed Available Groundwater – water that will be
  available to all end users that meets the DFC under
  applicable regulatory constraints

• MAG values are de facto “caps” and the mandatory basis
  for Regional/State Water Plans

• Rules adopting/enforcing MAGs and supporting DFCs are
  mandatory upon all GCDs in a GMA
Desired Future Condition (DFC) Presentation
Major and Minor Aquifers of
GMA #9
• Edwards (BFZ)
• Edwards-Trinity (Plateau)
• Trinity – Upper, Middle and Lower
• “Paleozoics”
  – Ellenburger-San Saba
  – Hickory
  – Marble Falls
GCDs of GMA 9
• Bandera County River Authority And Ground Water District
• Barton Springs/Edwards Aquifer Conservation District
• Blanco-Pedernales Groundwater Conservation District
• Cow Creek Groundwater Conservation District
• Edwards Aquifer Authority
• Hays Trinity Groundwater Conservation District
• Headwaters Groundwater Conservation District
• Medina County Groundwater Conservation District
• Trinity-Glen Rose Groundwater Conservation District
• No GCD in Comal or Travis Counties
Hydrogeology of Jacob’s Well and
            Cypress Creek

•Hydrogeologic Setting

•Sources of Water to Cypress Creek
     Base Flow from Jacob’s Well
     Storm Surge from Aquifer

     Storm Water Run-off
J acobs Well Dis charg e
                      140


                      120


                      100
                                               J acobs Well
                                               Dis charge
Dis c harg e (cfs )




                       80


                       60


                       40


                       20


                        0
                            8/1/0       2/17             9/5/0       3/24            10 /1            4/28         11 /1            6/1/0       12 /1            7/6/0       1/22
                                    4          /05               5          /06              0 /0 6          /07           4 /0 7           8           8 /0 8           9          /10
Local Stratigraphy
Developed by A.S. Broun,
District Geologist
Desired Future Condition (DFC) Presentation
Structural Cross Section B to B’ – Cypress Creek
Drainage
Lower Cretaceous Trinity Group, Hays County, Texas
Structural Cross Section B-B’
(cropped and enlarged)
Desired Future Condition (DFC) Presentation
Desired Future Condition (DFC) Presentation
Desired Future Condition (DFC) Presentation
Hydrogeology of Jacob’s Well and
Cypress Creek Takeaways

• Base Flow from Jacob’s Well is Cypress Creek

• Base Flow originates in the Cow Creek Member of the
  Middle Trinity Aquifer

• Recharge Zone is local and up dip to the west
Status of GMA #9 DFCs and MAGs

• GAM 9 has voted and approved DFCs for the
    Marble Falls, Ellenberger, Hickory and Edwards-
    Trinity (Plateau)
•   DFC for Edwards-Trinity (Plateau) set for the
    preservation of stream flow in the Upper
    Guadalupe River and it’s tributaries
•   MAG determined for the Edwards-Trinity
    (Plateau)
• MAG has been appealed
Status of GMA #9 DFCs and MAGs

• DFCs to be set for the Upper, Middle and Lower
  Trinity

• TWDB has performed several GAM runs at the
  request of GMA #9 for Upper and Middle Trinity
  aquifers, not Lower Trinity Aquifer

• 2000 GAM vs. 2009 GAM update
Hill County Trinity GAM
2000 GAM vs. 2009 GAM


• 2000 GAM included Edwards Trinity Plateau,
  Upper and Middle Trinity Aquifers

• 2009 GAM update added Lower Trinity

• All GAM runs to date use 2000 GAM

• New GAM runs with 2009 GAM in process
Hays Trinity Groundwater Conservation District
             Trinity aquifer Water Budget Based on the TWDB Edwards-Trinity aquifer GAM
                                           (in acre-feet per year)


                    Recharge
                 (rainfall infiltration)


                                             Pumping
                                                                    Springs & Seeps
                                                                          (Stream Leakage)



             Upper Trinity aquifer
             •Upper Glen Rose Formation
                                                                        Loss                         Edwards
Gains to                                                            to Edwards                        aquifer
Aquifer                                                               Aquifer
Storage                                                            (Head Dependant Bounds)
 (Storage)


             Middle Trinity aquifer
             •Lower Glen Rose Formation                                  Down-gradient
                                                                         Movement Out
             •Hensel Sand
                                                                           of HTGCD
             •Cow Creek Limestone                                            (Horizontal Exchange)



                                  Hammett Shale (aquitard)
                                                                                                      Trinity
             Lower Trinity aquifer – Not Included in Model                                           aquifer
             •Sligo & Hosston Formations
GAM Runs HTGCD Middle Trinity

•   Steady-State (GAM Run 08-70a)
•   2008 Current Pumping
•   GAM Run 08-20, 15-ft drawdown
•   GAM Run 08-70a (25% > 2008)
•   GAM Run 08-70b (50% > 2008)
•   GAM Run 08-30, variable drawdown
•   GAM Run 08-15, 35-ft drawdown
Middle Trinity – Initial Water Levels
Middle Trinity – 35’ Draw Down
HTGCD 2008 Groundwater Pumpage
Total Non-Exempt Production               2371 ac-ft       42%

Exempt Agricultural Use                   897 ac-ft        16%

Exempt Domestic Wells (330 gpd)           2403 ac-ft       42%

TOTAL                                     5671 ac-ft       100%

Upper and Middle Trinity/Lower Trinity    5385/286 ac-ft

Available Upper and Middle Trinity from   3713 ac-ft
2005 HTGCD Management Plan
Hays County

                         45                                                                                                Est. Average Drawdown             14,000
                                     Rivers & Springs discharge                                                            from Steady State
                         40
                                                                                                                                                             12,000
                         35
                                                                                                                                                             10,000
                         30
Average Drawdown (ft)*




                                                                                                                                                                      Discharge (ac-ft/yr)
                         25                                                                                                                                  8,000

                         20                                                                                                                                  6,000

                         15
                                                                                                                                                             4,000
                                  Balcones Fault Zone outflow
                         10
                                                                                                                                                             2,000
                          5

                          0                                                                                                                                 0
                              0           2,000            4,000             6,000             8,000             10,000             12,000             14,000
                                                                               Pumping (ac-ft/yr)

                                       Estimated Avg Drawdown (ft) from SS           Rivers & Springs (Drain) (ac-ft/yr)           BFZ (outflow; ac-ft/yr)
Drought of record, or not…
Do we consider the DOR, or
 do we close the DOR and
 just be average?
• Should we plan for average precipitation or
   DOR?

• Is sustainability always the best policy? Is it
   always a possible policy?

• Use of drought planning during DOR?
The Real Issue


   How does the HTGCD allocate a finite
     resource that has never been fully
  regulated in an environment where most
    feel it is their right to pump as much
          groundwater as they want.
GMA
                              Allowable
  Designated      Public
                              Pumping
    Reps


                            Implementing
           Setting           Policies and
GMA         DFCs             Procedures




        Determining            District
TWDB                        Rules & Bylaws    Enabling
           MAGs                              Legislation
         By Aquifer


        Distributing           District        TWC
TWDB      MAGs to            Management      Chapter 36
        GCDs/Cty’s            Plan 2010

  Joint Regional Planning   GCD Processes    Statutes
Possible Allocation Strategies

• Management Zones
  – Recognize that different aquifers and geologic conditions exist

  – Occurrence and maintenance of stream flow varies across
    District

  – Recharge characteristics vary across District (age of water and
    mining)
Possible Allocation Strategies

• Historical Use for Non-Exempt Wells

  – Water right based on some portion of past production

  – May be permanent or short term

  – May be transferable and/or marketable to other areas
    or other uses
Possible Allocation Strategies


• Reasonable Use for Non-Exempt Wells

  – Current permitting strategy for the HTGCD


  – Permits based on a “reasonable” amount of
    water for a specified purpose and duration
Possible Allocation Strategies

• Quantifiable Property Rights

  – Often referred to as correlative right

  – Based in amount of land owned or controlled

  – May be transferable (marketable) to other areas or
    other uses

  – Could include multiple aquifers beneath a property
Challenges to the HTGCD

• Exempt Wells - Residential
  – Single family domestic use exempt up to
    25,000 gpd
  – Domestic wells can be drilled on any size lot
  – Current pumpage estimates rely on 330 gpd
    that results in 42% (2403 ac-ft) of 2008
    pumpage
  – Using the exempt “permitted” amount,
    domestic wells could use 182,000 ac-ft
Challenges to the HTGCD

• Exempt Wells –Agricultural Wells

  – Exempt from permitting and regulation

  – Vineyards and orchards are increasing and
    expected to continue to grow

  – Currently using 16% of total production
Impact of Exempt Use Growth

                2008 GW Production




    2371, 42%
                                     Exempt Uses
                                     Non-Exempt Uses
                         3300, 58%
Impact of Exempt Use Growth

     2033 GW Production with 2% Annual Exempt Growth and 6000 ac-ft MAG



                        300, 5%




                                                               Exempt
                                                               Non-Exepmt




                                  5700, 95%
DFC Process and Cypress Creek Project

  • HTGCD needs stakeholder feedback on desired
   condition of Cypress Creek

    – Are aesthetics of flow the primary criteria?
    – Is a Jacob’s Well management area necessary?
    – What level of flow keeps creek off the 303d list?
    – What is the acceptable level of risk of the creek going
      dry?
    – Is the community ready to bear the financial cost of a
      low risk strategy?
Implementation Schedule
• DFCs/MAGs – 1Q 2010

• Revise Management Plan – 2Q 2010

• Adopt New Rules – 3Q 2010

• Rule Implementation – 4Q 2010

• GMA 9 meets at least annually to monitor progress
  towards DFCs

• GAM 9 revisits and may reset DFCs in five years (or
  less?)
Desired Future Condition (DFC) Presentation
Desired Future Condition (DFC) Presentation
Historical Water Level Trends
                                         30º 11' 47'' North                     Henly Church                                          Middle Trinity
                                         98º 12' 45'' West                       57-55-401                                           Depth 460 feet
                                                                                                                                Elevation 1326 feet
                                                                                                                                Colorado watershed

                               1100
                                                                                  Water Level
                               1080
                                                                                  Linear Regression

                               1060
Water Level Elevation (feet)




                               1040

                               1020
                                                                                                                    y = -0.14x + 1186
                               1000


                               980

                               960

                               940

                               920

                               900
                                      Jan-99




                                                     Jan-00




                                                              Jan-01




                                                                                 Jan-03




                                                                                                Jan-04




                                                                                                         Jan-05




                                                                                                                                Jan-07




                                                                                                                                             Jan-08
                                                                       Jan-02




                                                                                          Month                   Jan-06
Current Thinking of HTGCD
• Due to the nature of the GAM, be
  conservative at this time
• Allow for MAG to be metered out to
  account for growth of exempt wells
• Set up groundwater management zones in
  critical areas
• Account for DOR through drought
  planning
Where Does GMA-9 Go From
                   Here?


              More Assessments
               More Public Input
           More Decision-making
         More Recommendations
        Complete process in 2009
1 of 48

Recommended

TERS Presentation by
TERS PresentationTERS Presentation
TERS Presentationhtgcd
886 views9 slides
9 greg mc carty-svi_choptank by
9   greg mc carty-svi_choptank9   greg mc carty-svi_choptank
9 greg mc carty-svi_choptankSoil and Water Conservation Society
333 views8 slides
Lake Choconut Drainage Area Erosion by
Lake Choconut Drainage Area ErosionLake Choconut Drainage Area Erosion
Lake Choconut Drainage Area ErosionRachelMordovancey
77 views28 slides
Gec 1997 by
Gec 1997Gec 1997
Gec 1997Anand A.V.S.S
5.1K views123 slides
Beeville MLT_Groundwater 101_Marcus Gary by
Beeville MLT_Groundwater 101_Marcus GaryBeeville MLT_Groundwater 101_Marcus Gary
Beeville MLT_Groundwater 101_Marcus GaryTexas Alliance of Groundwater Districts
164 views39 slides
Integrated Surface Water and Groundwater Interaction Modelling using GSFLOW by
Integrated Surface Water and Groundwater Interaction Modelling using GSFLOWIntegrated Surface Water and Groundwater Interaction Modelling using GSFLOW
Integrated Surface Water and Groundwater Interaction Modelling using GSFLOWDirk Kassenaar M.Sc. P.Eng.
1.2K views53 slides

More Related Content

What's hot

Groundwater hydrology by
Groundwater hydrologyGroundwater hydrology
Groundwater hydrologyAnoop Shrestha
4.9K views46 slides
Simulating hydrologic response to climate change and drought with an integrat... by
Simulating hydrologic response to climate change and drought with an integrat...Simulating hydrologic response to climate change and drought with an integrat...
Simulating hydrologic response to climate change and drought with an integrat...Dirk Kassenaar M.Sc. P.Eng.
544 views50 slides
Development of a Field-Scale Research Facility to Assess the Effects of Sea L... by
Development of a Field-Scale Research Facility to Assess the Effects of Sea L...Development of a Field-Scale Research Facility to Assess the Effects of Sea L...
Development of a Field-Scale Research Facility to Assess the Effects of Sea L...RachelMordovancey
98 views72 slides
Professional Geologist Work Experience by
Professional Geologist Work ExperienceProfessional Geologist Work Experience
Professional Geologist Work ExperienceWilliamOlsenPG
24 views4 slides
Analysis of Low Impact Development (LID) Strategies using Fully-Integrated Fu... by
Analysis of Low Impact Development (LID) Strategies using Fully-Integrated Fu...Analysis of Low Impact Development (LID) Strategies using Fully-Integrated Fu...
Analysis of Low Impact Development (LID) Strategies using Fully-Integrated Fu...Dirk Kassenaar M.Sc. P.Eng.
778 views39 slides
Applications of Integrated Models to Watershed and Sub-Watershed Scale Analys... by
Applications of Integrated Models to Watershed and Sub-Watershed Scale Analys...Applications of Integrated Models to Watershed and Sub-Watershed Scale Analys...
Applications of Integrated Models to Watershed and Sub-Watershed Scale Analys...Dirk Kassenaar M.Sc. P.Eng.
769 views35 slides

What's hot(20)

Simulating hydrologic response to climate change and drought with an integrat... by Dirk Kassenaar M.Sc. P.Eng.
Simulating hydrologic response to climate change and drought with an integrat...Simulating hydrologic response to climate change and drought with an integrat...
Simulating hydrologic response to climate change and drought with an integrat...
Development of a Field-Scale Research Facility to Assess the Effects of Sea L... by RachelMordovancey
Development of a Field-Scale Research Facility to Assess the Effects of Sea L...Development of a Field-Scale Research Facility to Assess the Effects of Sea L...
Development of a Field-Scale Research Facility to Assess the Effects of Sea L...
Professional Geologist Work Experience by WilliamOlsenPG
Professional Geologist Work ExperienceProfessional Geologist Work Experience
Professional Geologist Work Experience
WilliamOlsenPG24 views
Analysis of Low Impact Development (LID) Strategies using Fully-Integrated Fu... by Dirk Kassenaar M.Sc. P.Eng.
Analysis of Low Impact Development (LID) Strategies using Fully-Integrated Fu...Analysis of Low Impact Development (LID) Strategies using Fully-Integrated Fu...
Analysis of Low Impact Development (LID) Strategies using Fully-Integrated Fu...
Applications of Integrated Models to Watershed and Sub-Watershed Scale Analys... by Dirk Kassenaar M.Sc. P.Eng.
Applications of Integrated Models to Watershed and Sub-Watershed Scale Analys...Applications of Integrated Models to Watershed and Sub-Watershed Scale Analys...
Applications of Integrated Models to Watershed and Sub-Watershed Scale Analys...
Analysis of Groundwater/Surface Water Interaction at the Site Scale Babcock R... by Dirk Kassenaar M.Sc. P.Eng.
Analysis of Groundwater/Surface Water Interaction at the Site Scale Babcock R...Analysis of Groundwater/Surface Water Interaction at the Site Scale Babcock R...
Analysis of Groundwater/Surface Water Interaction at the Site Scale Babcock R...
Estimation of Groundwater Recharge Using WetSpass and MODFLOW by Putika Ashfar Khoiri
Estimation of Groundwater Recharge  Using WetSpass and MODFLOWEstimation of Groundwater Recharge  Using WetSpass and MODFLOW
Estimation of Groundwater Recharge Using WetSpass and MODFLOW
Modelling of a Coastal Aquifer using FEFLOW by C. P. Kumar
Modelling of a Coastal Aquifer using FEFLOWModelling of a Coastal Aquifer using FEFLOW
Modelling of a Coastal Aquifer using FEFLOW
C. P. Kumar3.2K views
Integrated Modelling as a Tool for Assessing Groundwater Sustainability under... by Dirk Kassenaar M.Sc. P.Eng.
Integrated Modelling as a Tool for Assessing Groundwater Sustainability under...Integrated Modelling as a Tool for Assessing Groundwater Sustainability under...
Integrated Modelling as a Tool for Assessing Groundwater Sustainability under...
Applications of Integrated Surface Water Groundwater Modelling Techniques and... by Dirk Kassenaar M.Sc. P.Eng.
Applications of Integrated Surface Water Groundwater Modelling Techniques and...Applications of Integrated Surface Water Groundwater Modelling Techniques and...
Applications of Integrated Surface Water Groundwater Modelling Techniques and...
A New Methodology for Identifying Ecologically Significant Groundwater Rechar... by Dirk Kassenaar M.Sc. P.Eng.
A New Methodology for Identifying Ecologically Significant Groundwater Rechar...A New Methodology for Identifying Ecologically Significant Groundwater Rechar...
A New Methodology for Identifying Ecologically Significant Groundwater Rechar...

Similar to Desired Future Condition (DFC) Presentation

Current State of Groundwater Management, Larry French by
Current State of Groundwater Management, Larry FrenchCurrent State of Groundwater Management, Larry French
Current State of Groundwater Management, Larry FrenchTXGroundwaterSummit
785 views27 slides
The current status of ASR Technology: Firming up Victoria's water supply by
The current status of ASR Technology: Firming up Victoria's water supplyThe current status of ASR Technology: Firming up Victoria's water supply
The current status of ASR Technology: Firming up Victoria's water supplyThe Texas Network, LLC
1.2K views65 slides
Southwestern Division Pacesetters - Transforming the Corps of Engineers Civil... by
Southwestern Division Pacesetters - Transforming the Corps of Engineers Civil...Southwestern Division Pacesetters - Transforming the Corps of Engineers Civil...
Southwestern Division Pacesetters - Transforming the Corps of Engineers Civil...The Texas Network, LLC
815 views26 slides
Nisqually Thin Project by
Nisqually Thin ProjectNisqually Thin Project
Nisqually Thin ProjectNisqually River Council
333 views47 slides
Roger Falconer and Chris Binnie - Sustainable Severn Forum 2017 by
Roger Falconer and Chris Binnie - Sustainable Severn Forum 2017Roger Falconer and Chris Binnie - Sustainable Severn Forum 2017
Roger Falconer and Chris Binnie - Sustainable Severn Forum 2017Sustainable Severn
305 views23 slides
C2VSim Workshop 5 - C2VSim Surface Water Representation by
C2VSim Workshop 5 - C2VSim Surface Water RepresentationC2VSim Workshop 5 - C2VSim Surface Water Representation
C2VSim Workshop 5 - C2VSim Surface Water RepresentationCharlie Brush
372 views46 slides

Similar to Desired Future Condition (DFC) Presentation(20)

Current State of Groundwater Management, Larry French by TXGroundwaterSummit
Current State of Groundwater Management, Larry FrenchCurrent State of Groundwater Management, Larry French
Current State of Groundwater Management, Larry French
The current status of ASR Technology: Firming up Victoria's water supply by The Texas Network, LLC
The current status of ASR Technology: Firming up Victoria's water supplyThe current status of ASR Technology: Firming up Victoria's water supply
The current status of ASR Technology: Firming up Victoria's water supply
Southwestern Division Pacesetters - Transforming the Corps of Engineers Civil... by The Texas Network, LLC
Southwestern Division Pacesetters - Transforming the Corps of Engineers Civil...Southwestern Division Pacesetters - Transforming the Corps of Engineers Civil...
Southwestern Division Pacesetters - Transforming the Corps of Engineers Civil...
Roger Falconer and Chris Binnie - Sustainable Severn Forum 2017 by Sustainable Severn
Roger Falconer and Chris Binnie - Sustainable Severn Forum 2017Roger Falconer and Chris Binnie - Sustainable Severn Forum 2017
Roger Falconer and Chris Binnie - Sustainable Severn Forum 2017
Sustainable Severn305 views
C2VSim Workshop 5 - C2VSim Surface Water Representation by Charlie Brush
C2VSim Workshop 5 - C2VSim Surface Water RepresentationC2VSim Workshop 5 - C2VSim Surface Water Representation
C2VSim Workshop 5 - C2VSim Surface Water Representation
Charlie Brush372 views
C2VSim Workshop 6 - Closing by Charlie Brush
C2VSim Workshop 6 - ClosingC2VSim Workshop 6 - Closing
C2VSim Workshop 6 - Closing
Charlie Brush698 views
GCD Panel - Management Strategies (East/Central Texas), Gary Westbrook by TXGroundwaterSummit
GCD Panel - Management Strategies (East/Central Texas), Gary WestbrookGCD Panel - Management Strategies (East/Central Texas), Gary Westbrook
GCD Panel - Management Strategies (East/Central Texas), Gary Westbrook
C2VSim Workshop 2 - Overview of C2VSim by Charlie Brush
C2VSim Workshop 2 - Overview of C2VSimC2VSim Workshop 2 - Overview of C2VSim
C2VSim Workshop 2 - Overview of C2VSim
Charlie Brush464 views
SARVESH hydro electric-power-plant by sarvesh kumar
SARVESH hydro electric-power-plantSARVESH hydro electric-power-plant
SARVESH hydro electric-power-plant
sarvesh kumar2.1K views
hydro chapter_11_hydrology_by louy al hami by Louy Alhamy
hydro  chapter_11_hydrology_by louy al hami hydro  chapter_11_hydrology_by louy al hami
hydro chapter_11_hydrology_by louy al hami
Louy Alhamy17.8K views
The importance of groundwater surface water interaction - a case study on Rio... by The Texas Network, LLC
The importance of groundwater surface water interaction - a case study on Rio...The importance of groundwater surface water interaction - a case study on Rio...
The importance of groundwater surface water interaction - a case study on Rio...
Wgc 2009 shtokman flow assurance no_backup by Erich Zakarian
Wgc 2009 shtokman flow assurance no_backupWgc 2009 shtokman flow assurance no_backup
Wgc 2009 shtokman flow assurance no_backup
Erich Zakarian491 views

Recently uploaded

The Future of Micro-credentials: Is Small Really Beautiful? by
The Future of Micro-credentials:  Is Small Really Beautiful?The Future of Micro-credentials:  Is Small Really Beautiful?
The Future of Micro-credentials: Is Small Really Beautiful?Mark Brown
75 views35 slides
Gross Anatomy of the Liver by
Gross Anatomy of the LiverGross Anatomy of the Liver
Gross Anatomy of the Liverobaje godwin sunday
77 views12 slides
11.30.23A Poverty and Inequality in America.pptx by
11.30.23A Poverty and Inequality in America.pptx11.30.23A Poverty and Inequality in America.pptx
11.30.23A Poverty and Inequality in America.pptxmary850239
130 views18 slides
Creative Restart 2023: Leonard Savage - The Permanent Brief: Unearthing unobv... by
Creative Restart 2023: Leonard Savage - The Permanent Brief: Unearthing unobv...Creative Restart 2023: Leonard Savage - The Permanent Brief: Unearthing unobv...
Creative Restart 2023: Leonard Savage - The Permanent Brief: Unearthing unobv...Taste
55 views21 slides
StudioX.pptx by
StudioX.pptxStudioX.pptx
StudioX.pptxNikhileshSathyavarap
101 views18 slides
Berry country.pdf by
Berry country.pdfBerry country.pdf
Berry country.pdfMariaKenney3
75 views12 slides

Recently uploaded(20)

The Future of Micro-credentials: Is Small Really Beautiful? by Mark Brown
The Future of Micro-credentials:  Is Small Really Beautiful?The Future of Micro-credentials:  Is Small Really Beautiful?
The Future of Micro-credentials: Is Small Really Beautiful?
Mark Brown75 views
11.30.23A Poverty and Inequality in America.pptx by mary850239
11.30.23A Poverty and Inequality in America.pptx11.30.23A Poverty and Inequality in America.pptx
11.30.23A Poverty and Inequality in America.pptx
mary850239130 views
Creative Restart 2023: Leonard Savage - The Permanent Brief: Unearthing unobv... by Taste
Creative Restart 2023: Leonard Savage - The Permanent Brief: Unearthing unobv...Creative Restart 2023: Leonard Savage - The Permanent Brief: Unearthing unobv...
Creative Restart 2023: Leonard Savage - The Permanent Brief: Unearthing unobv...
Taste55 views
BÀI TẬP BỔ TRỢ TIẾNG ANH 11 THEO ĐƠN VỊ BÀI HỌC - CẢ NĂM - CÓ FILE NGHE (FRIE... by Nguyen Thanh Tu Collection
BÀI TẬP BỔ TRỢ TIẾNG ANH 11 THEO ĐƠN VỊ BÀI HỌC - CẢ NĂM - CÓ FILE NGHE (FRIE...BÀI TẬP BỔ TRỢ TIẾNG ANH 11 THEO ĐƠN VỊ BÀI HỌC - CẢ NĂM - CÓ FILE NGHE (FRIE...
BÀI TẬP BỔ TRỢ TIẾNG ANH 11 THEO ĐƠN VỊ BÀI HỌC - CẢ NĂM - CÓ FILE NGHE (FRIE...
Education of marginalized and socially disadvantages segments.pptx by GarimaBhati5
Education of marginalized and socially disadvantages segments.pptxEducation of marginalized and socially disadvantages segments.pptx
Education of marginalized and socially disadvantages segments.pptx
GarimaBhati543 views
Career Building in AI - Technologies, Trends and Opportunities by WebStackAcademy
Career Building in AI - Technologies, Trends and OpportunitiesCareer Building in AI - Technologies, Trends and Opportunities
Career Building in AI - Technologies, Trends and Opportunities
WebStackAcademy45 views
CUNY IT Picciano.pptx by apicciano
CUNY IT Picciano.pptxCUNY IT Picciano.pptx
CUNY IT Picciano.pptx
apicciano64 views
INT-244 Topic 6b Confucianism by S Meyer
INT-244 Topic 6b ConfucianismINT-244 Topic 6b Confucianism
INT-244 Topic 6b Confucianism
S Meyer45 views
JRN 362 - Lecture Twenty-Three (Epilogue) by Rich Hanley
JRN 362 - Lecture Twenty-Three (Epilogue)JRN 362 - Lecture Twenty-Three (Epilogue)
JRN 362 - Lecture Twenty-Three (Epilogue)
Rich Hanley41 views
Guess Papers ADC 1, Karachi University by Khalid Aziz
Guess Papers ADC 1, Karachi UniversityGuess Papers ADC 1, Karachi University
Guess Papers ADC 1, Karachi University
Khalid Aziz99 views
EILO EXCURSION PROGRAMME 2023 by info33492
EILO EXCURSION PROGRAMME 2023EILO EXCURSION PROGRAMME 2023
EILO EXCURSION PROGRAMME 2023
info33492202 views

Desired Future Condition (DFC) Presentation

  • 1. Cypress Creek Project and the Desired Future Conditions Process Negotiating the Bumps at the Intersection of Science and Public Policy Douglas A. Wierman, P.G., Hays Trinity GCD October 1, 2009
  • 2. Alphabet Soup • GMA – Groundwater Management Area • GCD – Groundwater Conservation District • DFC – Desired Future Condition • MAG – Managed Available Groundwater • GAM – Groundwater Availability Model • TWDB – Texas Water Development Board • DOR – Drought of Record
  • 3. Outline of Today’s Presentation • Overview of the DFC Process • Hydrogeology of Jacob’s Well and Cypress Creek • Status of GMA #9 DFCs and MAGs • Possible DFC/MAG Implementation Strategies in HTGCD
  • 4. Overview of the DFC Process • In September, 2005, House Bill 1763 of the 79th Texas legislature became effective. HB 1763 was incorporated into Chapter 36 of the Texas Water Code. No funding made available. • Groundwater planning was regionalized into Groundwater Management Areas (GMAs) which consist of individual GCDs and areas not included in a GCD. • With significant public input, GMAs must establish a Desired Future Conditions for each aquifer in the GMA for the period 2010 through 2060 by September 2010.
  • 5. Overview of the DFC Process • TWDB, primarily through the use of groundwater availability models, determines how much water can be pumped from the aquifer to achieve the DFC. This volume of water is known as the Managed Available Groundwater, or MAG. • With public input, individual GCDs must develop management strategies and rules to permit groundwater withdrawal up to the MAG.
  • 6. Desired Future Conditions • A quantitative description of a natural aquifer condition/property as a goal – not well discharges • DFCs are set for all aquifers in a GMA • Aquifer may be subdivided “geographically” • Approved by vote of two thirds of at least two- thirds of the GMA’s GCDs (In GMA #9, as few as 4 of 9 GCDs can determine DFCs for the entire GMA)
  • 7. Managed Available Groundwater • Managed Available Groundwater – water that will be available to all end users that meets the DFC under applicable regulatory constraints • MAG values are de facto “caps” and the mandatory basis for Regional/State Water Plans • Rules adopting/enforcing MAGs and supporting DFCs are mandatory upon all GCDs in a GMA
  • 9. Major and Minor Aquifers of GMA #9 • Edwards (BFZ) • Edwards-Trinity (Plateau) • Trinity – Upper, Middle and Lower • “Paleozoics” – Ellenburger-San Saba – Hickory – Marble Falls
  • 10. GCDs of GMA 9 • Bandera County River Authority And Ground Water District • Barton Springs/Edwards Aquifer Conservation District • Blanco-Pedernales Groundwater Conservation District • Cow Creek Groundwater Conservation District • Edwards Aquifer Authority • Hays Trinity Groundwater Conservation District • Headwaters Groundwater Conservation District • Medina County Groundwater Conservation District • Trinity-Glen Rose Groundwater Conservation District • No GCD in Comal or Travis Counties
  • 11. Hydrogeology of Jacob’s Well and Cypress Creek •Hydrogeologic Setting •Sources of Water to Cypress Creek Base Flow from Jacob’s Well Storm Surge from Aquifer Storm Water Run-off
  • 12. J acobs Well Dis charg e 140 120 100 J acobs Well Dis charge Dis c harg e (cfs ) 80 60 40 20 0 8/1/0 2/17 9/5/0 3/24 10 /1 4/28 11 /1 6/1/0 12 /1 7/6/0 1/22 4 /05 5 /06 0 /0 6 /07 4 /0 7 8 8 /0 8 9 /10
  • 13. Local Stratigraphy Developed by A.S. Broun, District Geologist
  • 15. Structural Cross Section B to B’ – Cypress Creek Drainage Lower Cretaceous Trinity Group, Hays County, Texas
  • 16. Structural Cross Section B-B’ (cropped and enlarged)
  • 20. Hydrogeology of Jacob’s Well and Cypress Creek Takeaways • Base Flow from Jacob’s Well is Cypress Creek • Base Flow originates in the Cow Creek Member of the Middle Trinity Aquifer • Recharge Zone is local and up dip to the west
  • 21. Status of GMA #9 DFCs and MAGs • GAM 9 has voted and approved DFCs for the Marble Falls, Ellenberger, Hickory and Edwards- Trinity (Plateau) • DFC for Edwards-Trinity (Plateau) set for the preservation of stream flow in the Upper Guadalupe River and it’s tributaries • MAG determined for the Edwards-Trinity (Plateau) • MAG has been appealed
  • 22. Status of GMA #9 DFCs and MAGs • DFCs to be set for the Upper, Middle and Lower Trinity • TWDB has performed several GAM runs at the request of GMA #9 for Upper and Middle Trinity aquifers, not Lower Trinity Aquifer • 2000 GAM vs. 2009 GAM update
  • 23. Hill County Trinity GAM 2000 GAM vs. 2009 GAM • 2000 GAM included Edwards Trinity Plateau, Upper and Middle Trinity Aquifers • 2009 GAM update added Lower Trinity • All GAM runs to date use 2000 GAM • New GAM runs with 2009 GAM in process
  • 24. Hays Trinity Groundwater Conservation District Trinity aquifer Water Budget Based on the TWDB Edwards-Trinity aquifer GAM (in acre-feet per year) Recharge (rainfall infiltration) Pumping Springs & Seeps (Stream Leakage) Upper Trinity aquifer •Upper Glen Rose Formation Loss Edwards Gains to to Edwards aquifer Aquifer Aquifer Storage (Head Dependant Bounds) (Storage) Middle Trinity aquifer •Lower Glen Rose Formation Down-gradient Movement Out •Hensel Sand of HTGCD •Cow Creek Limestone (Horizontal Exchange) Hammett Shale (aquitard) Trinity Lower Trinity aquifer – Not Included in Model aquifer •Sligo & Hosston Formations
  • 25. GAM Runs HTGCD Middle Trinity • Steady-State (GAM Run 08-70a) • 2008 Current Pumping • GAM Run 08-20, 15-ft drawdown • GAM Run 08-70a (25% > 2008) • GAM Run 08-70b (50% > 2008) • GAM Run 08-30, variable drawdown • GAM Run 08-15, 35-ft drawdown
  • 26. Middle Trinity – Initial Water Levels
  • 27. Middle Trinity – 35’ Draw Down
  • 28. HTGCD 2008 Groundwater Pumpage Total Non-Exempt Production 2371 ac-ft 42% Exempt Agricultural Use 897 ac-ft 16% Exempt Domestic Wells (330 gpd) 2403 ac-ft 42% TOTAL 5671 ac-ft 100% Upper and Middle Trinity/Lower Trinity 5385/286 ac-ft Available Upper and Middle Trinity from 3713 ac-ft 2005 HTGCD Management Plan
  • 29. Hays County 45 Est. Average Drawdown 14,000 Rivers & Springs discharge from Steady State 40 12,000 35 10,000 30 Average Drawdown (ft)* Discharge (ac-ft/yr) 25 8,000 20 6,000 15 4,000 Balcones Fault Zone outflow 10 2,000 5 0 0 0 2,000 4,000 6,000 8,000 10,000 12,000 14,000 Pumping (ac-ft/yr) Estimated Avg Drawdown (ft) from SS Rivers & Springs (Drain) (ac-ft/yr) BFZ (outflow; ac-ft/yr)
  • 30. Drought of record, or not…
  • 31. Do we consider the DOR, or do we close the DOR and just be average? • Should we plan for average precipitation or DOR? • Is sustainability always the best policy? Is it always a possible policy? • Use of drought planning during DOR?
  • 32. The Real Issue How does the HTGCD allocate a finite resource that has never been fully regulated in an environment where most feel it is their right to pump as much groundwater as they want.
  • 33. GMA Allowable Designated Public Pumping Reps Implementing Setting Policies and GMA DFCs Procedures Determining District TWDB Rules & Bylaws Enabling MAGs Legislation By Aquifer Distributing District TWC TWDB MAGs to Management Chapter 36 GCDs/Cty’s Plan 2010 Joint Regional Planning GCD Processes Statutes
  • 34. Possible Allocation Strategies • Management Zones – Recognize that different aquifers and geologic conditions exist – Occurrence and maintenance of stream flow varies across District – Recharge characteristics vary across District (age of water and mining)
  • 35. Possible Allocation Strategies • Historical Use for Non-Exempt Wells – Water right based on some portion of past production – May be permanent or short term – May be transferable and/or marketable to other areas or other uses
  • 36. Possible Allocation Strategies • Reasonable Use for Non-Exempt Wells – Current permitting strategy for the HTGCD – Permits based on a “reasonable” amount of water for a specified purpose and duration
  • 37. Possible Allocation Strategies • Quantifiable Property Rights – Often referred to as correlative right – Based in amount of land owned or controlled – May be transferable (marketable) to other areas or other uses – Could include multiple aquifers beneath a property
  • 38. Challenges to the HTGCD • Exempt Wells - Residential – Single family domestic use exempt up to 25,000 gpd – Domestic wells can be drilled on any size lot – Current pumpage estimates rely on 330 gpd that results in 42% (2403 ac-ft) of 2008 pumpage – Using the exempt “permitted” amount, domestic wells could use 182,000 ac-ft
  • 39. Challenges to the HTGCD • Exempt Wells –Agricultural Wells – Exempt from permitting and regulation – Vineyards and orchards are increasing and expected to continue to grow – Currently using 16% of total production
  • 40. Impact of Exempt Use Growth 2008 GW Production 2371, 42% Exempt Uses Non-Exempt Uses 3300, 58%
  • 41. Impact of Exempt Use Growth 2033 GW Production with 2% Annual Exempt Growth and 6000 ac-ft MAG 300, 5% Exempt Non-Exepmt 5700, 95%
  • 42. DFC Process and Cypress Creek Project • HTGCD needs stakeholder feedback on desired condition of Cypress Creek – Are aesthetics of flow the primary criteria? – Is a Jacob’s Well management area necessary? – What level of flow keeps creek off the 303d list? – What is the acceptable level of risk of the creek going dry? – Is the community ready to bear the financial cost of a low risk strategy?
  • 43. Implementation Schedule • DFCs/MAGs – 1Q 2010 • Revise Management Plan – 2Q 2010 • Adopt New Rules – 3Q 2010 • Rule Implementation – 4Q 2010 • GMA 9 meets at least annually to monitor progress towards DFCs • GAM 9 revisits and may reset DFCs in five years (or less?)
  • 46. Historical Water Level Trends 30º 11' 47'' North Henly Church Middle Trinity 98º 12' 45'' West 57-55-401 Depth 460 feet Elevation 1326 feet Colorado watershed 1100 Water Level 1080 Linear Regression 1060 Water Level Elevation (feet) 1040 1020 y = -0.14x + 1186 1000 980 960 940 920 900 Jan-99 Jan-00 Jan-01 Jan-03 Jan-04 Jan-05 Jan-07 Jan-08 Jan-02 Month Jan-06
  • 47. Current Thinking of HTGCD • Due to the nature of the GAM, be conservative at this time • Allow for MAG to be metered out to account for growth of exempt wells • Set up groundwater management zones in critical areas • Account for DOR through drought planning
  • 48. Where Does GMA-9 Go From Here? More Assessments More Public Input More Decision-making More Recommendations Complete process in 2009