Refined Groundwater Availability Model GAM) for the ... · Managed available groundwater...

RefinedGroundwater Availability Model GAM) for the

Seymour Aquiferin Haskell, Knox, and Baylor Counties

Stakeholder Advisory Forum 1Proposed Modeling Plan

October 23, 2008

Outline of Presentation

General Introduction to the TWDB GAM ProgramRefined Seymour GAM Team and RolesObjectives of Stakeholder Advisory ForumsBrief Overview of Seymour Aquifer Basics of Groundwater FlowBasics of Groundwater ModelingRefined Seymour GAM - OverviewExisting Seymour GAM vs. Refined Seymour GAMRefined Seymour GAM – Tools and InputsAdditional Data for the Refined ModelRefined Seymour GAM – Conceptual ModelRefined Seymour GAM Modeling ProcessModel LimitationsRefined Seymour GAM Schedule

Refined Seymour GAM Team and Roles

INTERA, Inc.– Project management– SAF meetings– Model development– GIS– Stakeholder communication

Bureau of Economic Geology, The University of Texas at Austin, – Aquifer recharge/discharge

data integrationWater Prospecting and Resource Consulting– Data gathering– Stakeholder communication

Dr. Jim Butler, P.G.– Senior technical input

Pre-development aquifer conditionsCurrent aquifer conditions

Dr. Graham Fogg– Senior technical review

Groundwater modelingSurface/groundwater interactions

TWDB GAM Program

TWDB GAM Program (cont)

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Region F Brazos G

Panhandle

Far West Texas

Region C

East Texas

Region H

Llano Estacado

Plateau

Rio Grande

South Central Texas

Region B

Coastal Bend

Lower Colorado

North East Texas

Lavaca

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GF

Groundwater Availability Modeling

Contract ManagerShirley Wade

Texas Water Development Board

Purpose: To develop tools that can be used to help GCDs, RWPGs, and others assess groundwater availability. Public Process: You get to see how the model is put together.Freely Available: Standardized, thoroughly documented, and available upon request.Living Tools: Periodically updated.

GAM


TWDB GAM Program (cont)CR1

TWDB GAM Program (cont)CR2

Managed available groundwater (MAG)…the amount of groundwater available for use.The State does not directly decide how much groundwater is available for use: GCDs will through GMA process. A GAM is a tool that can be used to assess groundwater availability once GCDs and GMAs decide on the desired future condition of the aquifer.

What isGroundwater

Availability or MAG?


Water Code & TWDB rules require that GCDs use GAM information, if available, for their management plans.TWDB rules require that RWPGs use managed available groundwater estimates, if developed in time for the planning cycle

Do we haveto use GAM?


The Model– Predict water levels and flows in response to pumping and drought– Effects of well fields

Data in the Model– Water in storage– Recharge estimates– Hydraulic properties

GMAs and RWPGs can request runs

How do weuse GAM?


GCDs, RWPGs, TWDB, and others collect new information on aquifer.This information can enhance the current GAMs.TWDB plans to update GAMs every five years with new information.Please share information and ideas with TWDB on aquifers and GAMs.

LivingTools


SAF meetings– Hear about progress on the model– Comment on model assumptions– Offer information (timing is important!)

Report review– At end of project

Contact TWDB– Contract manager

Participating inthe GAM Process


Comments:Comments:

Contract ManagerContract [email protected]@twdb.state.tx.us

(512) 936(512) 936--08830883www.twdb.state.tx.us/gamwww.twdb.state.tx.us/gam

Refined Seymour GAM Team Contact Information

INTERA, Inc.– John Pickens– Toya Jones– John Ewing

1812 Centre Creek Dr.Suite 300Austin, TX 78754(512) [email protected]@[email protected]

Bureau of Economic Geology (BEG)– Bridget Scanlon

Bureau of Economic GeologyThe University of Texas at Austin University Station, Box X Austin, TX 78713-8924 512) 471-0140 [email protected]

Water Prospecting and Resource Consulting (WPRC)– Andrew Chastian-Howley

100 East 15th StreetFort Worth, TX 76102

(512) [email protected]

Objectives of Stakeholder Advisory Forums

Interaction between the GAM team and interested stakeholders– Stakeholder communication and input are critical to the success

of the refined Seymour GAM– Stakeholders will be relied upon to voice issues and provide

information to ensure the model addresses the important water resource questions regarding the Seymour Aquifer

– SAF meetings will be held periodically to discuss modeling progress and solicit comments

Future updates – TWDB website– SAFs (as needed)

SAF presentations and questions and responses from meetings will be posted at http://www.twdb.state.tx.us/gam/symr/symr.htm

Brief Overview of Seymour Aquifer

0 40 80

Miles

Aquifer

OutcropDowndip

Cenozoic Pecos Alluvium

OutcropDowndip

OutcropDowndip

Gulf Coast

Hueco-Mesilla Bolson

Ogallala

Seymour

OutcropDowndip

Carrizo-Wilcox

Edwards

Edwards-Trinity (Plateau) Trinity

Major aquifersin Texas

Brief Overview of Seymour Aquifer (cont)

An unconfined (water-table) aquiferComposed of clay, silt, sand, and gravelGravel and sands occur primarily at baseBasal gravel and sand is the predominate water-bearing zoneThickness is typically up to 100 feetSaturated thickness typically less than 60 feet

Basics of Groundwater Flow

Definitions– Aquifer – Water saturated permeable geologic unit that

can transmit significant quantities of water.– Water table – The level at which water stands in a shallow

screened well.– Hydraulic head - The water level in a well expressed as an

elevation.– Hydraulic conductivity – A physical property of the geologic

media representing its ability to transmit water.– Specific yield – The volume of water that an unconfined

aquifer releases from storage per unit surface area of aquifer per unit decline in water table elevation.

– Storativity – The volume of water that a confined aquifer releases from storage per unit surface area of aquifer per unit decline in head.

Basics of Groundwater Flow (cont)

Definitions (cont)– Recharge – The entry of water to the saturated zone at the

water table. Recharge equals water inputs at the ground surface (precipitation + irrigation) minus water losses (runoff + evapotranspiration).

– Stream losses or gains – The water that is either lost from an aquifer or gained by an aquifer through the base of the stream.

– Cross-formational flow – Groundwater flow between geologic formations.

Basics of Groundwater Flow (cont)

Principles– The primary observable quantity describing groundwater

flow is the water level as measured in a well.– The water level expressed as elevation is termed the

hydraulic head.– The difference in hydraulic head between wells defines

the direction of groundwater flow.Groundwater flows from high hydraulic head to low hydraulic head.

– The water table is typically a subdued replica of the topography.

– The saturated thickness and hydraulic conductivity of the aquifer material define the volumetric flow rates (e.g., pumping).

Schematic Cross Section of Groundwater Flow

Groundwater flows from high hydraulic potential (energy) to low hydraulic potential.

Basics of Groundwater Modeling

Definition of a model– A representation of reality that attempts to explain the behavior

of some aspect of reality and is always less complex than the real system it represents (Domenico, 1972)

– A tool designed to represent a simplified version of reality (Wang and Anderson, 1982)

Why do we model groundwater flow– Groundwater, unlike surface water, is difficult to directly observe– Aquifers are typically complex in terms of spatial extent and

hydrogeologic characteristics– Groundwater models provide the only means for integrating

available data and predicting groundwater flow at the scale of interest

Basics of Groundwater Modeling (cont)

Numerical Groundwater Flow Model– Is a mathematical representation of a physical aquifer– Uses the basic laws of physics that govern groundwater flow– Represents the aquifer using discrete parameters– Calculates hydraulic heads at discrete locations determined by

the model grid– Values from the model parameters can be modified until the

model calculated hydraulic heads match observed hydraulic heads (i.e., model calibration)

– The calibrated model can be used as a tool to calculate future hydraulic heads in the aquifer

Basics of Groundwater Modeling (cont)

Modeling protocol (steps)– Define the model objectives and select the modeling tools best

able to meet the objectives– Gather and analyze the data

Model input parametersCalibration targets

– Develop a conceptual model of the physical system– Design the mathematical model– Calibrate the model to observed conditions– Analyze the sensitivity of the model to input values– Document all aspects of the modeling process in a report– Use the model to predict future conditions

Evaluate water management strategiesEvaluate GMA groundwater availability

•• Hydraulic ConductivityHydraulic Conductivity•• Storage valueStorage value•• ThicknessThickness

IrrigationIrrigationreturn flowreturn flow

Exchange of Exchange of water with water with

neighboring neighboring cellscells

NaturalNaturalrechargerecharge

Water Water remaining remaining in storagein storage

Water removed Water removed from storage by from storage by pumpingpumping

Gridblock Accounting

Basics of Groundwater Modeling (cont)RechargeRecharge

Refined Seymour GAM

Model objectives– Develop a three-dimensional realistic and

scientifically accurate groundwater flow model that represents the physical characteristics and relevant processes of the Seymour aquifer in Haskell, Knox, and Baylor counties and is suitable for use by stakeholders (e.g., the Rolling Plains GCD)

Refined Seymour Study Area

Wellington

QuanahChilicothe

ElectraCrowellPaducah

Benjamin

Memphis

Matador

Shamrock

KnoxCity

HaskellRule

Jayton

Rotan

Anson

Dickens

Spur

Roscoe Merkel

ChildressTurkey

Hedley

McLean Erick

MangumGranite

Hollis

Eldorado

Abilene

Wichita Falls

Vernon

Stamford

Burkburnett

Sweetwater

Hamlin

Seymour

Munday

Aspermont

Clay

Hall

King

Kent

Gray

Floyd

Knox

Jones

Nolan

Cottle

Motley

Taylor

Young

Fisher

Archer

Baylor

Scurry

Donley

Haskell

Foard

Briscoe

Mitchell

Dickens

Wheeler

Wilbarger

Stonewall

Wichita

Childress

Shackelford

Collingsworth

Hardeman

Throckmorton

Greer

Jackson

Beckham

Harmon

0 10 20

Miles

State Line

County Boundaries

Major Roadways

Urban Areas

Refined Seymour Study Area (cont)

Lake Kemp

Lake Stamford

Truscott Brine Lake Lake Diversion Lake Wichita

Millers Creek Reservoir

Santa Rosa Lake

Lake Pauline

Lake Davis

North Fork Buffalo Creek Reservoir

Lake Sweetwater

Baylor Lake

Lake Electra

0 10 20

Miles

State Line

County Boundaries

Streams & Rivers

Lakes & Reservoirs


Panhandle

Region B

LlanoEstacado

Brazos G Region C

Region F

0 10 20

Miles

State Line

County Boundaries

Regional Water Planning Group


Lone WolfGCD

High PlainsUWCD No.1

PanhandleGCD

Rolling PlainsGCD

Tri-CountyGCD

Wes-TexGCD

ClearForkGCD

Salt ForkUWCD Lower Seymour

GCD

CollingsworthCountyUWCD

__

0 10 20

Miles

State Line

County Boundaries

Groundwater Conservation District


Red RiverBasin

Brazos RiverBasin

Colorado RiverBasin

Trinity RiverBasin

State Line

County Lines

Rivers & Streams

Lakes & Reservoirs

River Basins

0 10 20

Miles


Land Surface Elevation (ft-MSL)3,001 - 3,5002,501 - 3,0002,301 - 2,5002,101 - 2,3001,901 - 2,1001,701 - 1,9001,501 - 1,7001,301 - 1,5001,101 - 1,300901 - 1,100661 - 900

0 10 20

Miles

State Line

County Boundaries

Lakes & Reservoirs

Streams & Rivers


0 10 20

Miles

Precipitation (in/yr)

32.5 - 34.031.0 - 32.529.5 - 31.028.0 - 29.527.5 - 28.026.0 - 27.524.5 - 26.023.0 - 24.521.5 - 23.020.0 - 21.518.5 - 20.012.6 - 18.5

State Line

County Boundaries

Existing Seymour GAM Model Domain

Minor AquifersBlaine, OutcropBlain, DowndipDockum, OutcropDockum, DowndipEdward-Trinity

Major AquifersSeymourEdwards-TrinityOgallala

Model Boundary

State Line

County BoundariesFile

: SE

Y_2

.4_A

quife

r.mxd

Source: Online: Texas Water Development Board, August 2003

0 10 20

Miles

Refined Seymour GAM Model Domain

Knox

Haskell

Baylor

Throckmorton

King

Stonewall

WichitaGroup

Clear ForkGroup

SeymourFormation

Pease RiverGroup

Existing versus Refined Model

Model Input Existing Model Refined ModelGrid 1-mile by 1-mile 1/8-mile by 1/8-mile

Structure used DEM, point data from TWDB & TCEQ, will apply same data at refined scalecontour maps, and Seymour outline will include data from GCD well records

may include Brazos alluvium if data allowsHydraulic Conductivity interpolation of measurements and inferred add any new (>2003) data to interpolation

values from specific capacity tests add zones to differentiate between olderand younger deposits (TDWR, 1978)add data from GCD well records

Recharge temporal variability (monthly) and average Use data (Cl, H3/He3, matric potential) in recharge from SWAT simuations rangland and dryland and irrigated farmlandspatial variability from elevation model to describe predevelopment and land use/calibrated recharge relationships and historical land use

relationshipswill investigate irrigation return flow

Streams locations and geometry from RF1 no new information; repeat method undermonthly streamflows from gauge data refined conditions

Pumping annual data from TWDB no new information; repeat method undermonthly factors from Borrelli et al., 1998 refined conditions

ET temporal (monthly) and spatial variability follow methods in BEG & INTERA, 2005 andfrom SWAT modeling data from Borrelli et al. 1998

Springs used spring locations from Brune, TWDB either use fine scale USGS NHD coveragecounty reports, USGS database with DEM, place drains in all boundary cells,

or both

Refined Grid

Refined Grid – X-section Schematic

Interactions Between Model Grid Cells

NOTE: Grid blocks will be 1/8-mileby 1/8-mile not 1-mile by 1-mile

Refined Seymour GAM – Model Tool

MODFLOW-2000– Three-dimensional finite-difference groundwater flow code– Most widely accepted groundwater flow code in use today– Written and supported by the U.S. Geological Survey– Public domain– Well documented– Large user group– Supported by enhanced boundary condition packages to

handle recharge, evapotranspiration, streams, springs, and reservoirs

Groundwater Vistas for Windows Version 4– Graphical user interface for MODFLOW

Refined Seymour GAM - Input

Ground surface elevation– Digital elevation model (DEM)

Top and bottom elevations of the Seymour aquifer– TWDB Report 226 (Harden and Associates, 1978) – Driller’s logs from TWDB website, the Rolling Plains GCD, and TCEQ well

records

Structure Data Sources

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ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ


ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ


ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ


ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

Î

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ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ





ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ


ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ


ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎÎ

D D

D D D D

D

D

D

D

D D D

D

D D

D

D D

County Boundaries

Driller's Logs on TWDB Website

D Driller's Logs in TCEQ Records

Î Seymour Outline

Contours from Published Reports

0 2.5 5

Miles

LegendNew Structure Data

Existing GAM Additional Data from Rolling Plains GCD

Refined Seymour GAM - Input (cont)

Aquifer properties– Hydraulic conductivity

TWDB Report 226 (Harden and Associates, 1978)TWDB Bulletin 6209 (Ogilbee and Osborne, 1962) – Haskell and Knox County reportTWDB Report 218 (Preston, 1978) – Baylor County report Driller’s logs from TWDB website, the Rolling Plains GCD, and TCEQ well records

– Specific yieldTWDB Report 218 (Preston, 1978) – Baylor County report

Hydraulic Conductivity Data Sources

LegendNew SC Data

G

G

G

GGGGG

G GGGG GGG

G

County BoundariesG SC data from TCEQ

Field K data from County Reports

0 2.5 5

Miles

Existing GAM Additional Data from Rolling Plains GCD

Older and Younger Deposits

from R.W. Harden & Associates (1978)


Initial elevation of the water table– TWDB website– TWDB Report 226 (Harden and Associates, 1978)– TWDB Bulletin 6209 (Ogilbee and Osborne, 1962) – Haskell and Knox County

report– TWDB Report 218 (Preston, 1978) – Baylor County report

Hydraulic head data for the calibration period (1980 through 1997) – TWDB website– TWDB website– TWDB Report 226 (Harden and Associates, 1978)– TWDB Bulletin 6209 (Ogilbee and Osborne, 1962) – Haskell and Knox County

report– TWDB Report 218 (Preston, 1978) – Baylor County report

Water Level DataKnox

Haskell

Baylor

ThrockmortonS

tone

wal

lK

ing

approximately yearly measurementsseasonal measurements

Locations with Transient

Water-Level Data

2130202

2135702

2149601

2151702

2129102

2134402

2136201

Knox

Haskell

Baylor

ThrockmortonSto

new

all

Kin

g

Jan-

80Ja

n-81

Jan-

82

Jan-

83Ja

n-84

Jan-

85

Jan-

86Ja

n-87

Jan-

88Ja

n-89

Jan-

90

Jan-

91

Jan-

92Ja

n-93

Jan-

94Ja

n-95

Jan-

96

Jan-

97

Jan-

98Ja

n-99

Jan-

00

Jan-

01Ja

n-02

Jan-

03

Jan-

04

Jan-

05Ja

n-06

Jan-

07

Jan-

08

Jan-

09

Date

1255

1260

1265

1270

1275

1280

1285

1290

1295

Wat

er -L

evel

Ele

vatio

n (fe

et)

21-30-202Baylor County

base of well

Jan-

80Ja

n-81

Jan-

82

Jan-

83Ja

n-84

Jan-

85

Jan-

86Ja

n-87

Jan-

88Ja

n-89

Jan-

90

Jan-

91

Jan-

92Ja

n-93

Jan-

94Ja

n-95

Jan-

96

Jan-

97

Jan-

98Ja

n-99

Jan-

00

Jan-

01Ja

n-02

Jan-

03

Jan-

04

Jan-

05Ja

n-06

Jan-

07

Jan-

08

Jan-

09

Date

1480

1485

1490

1495

1500

1505

1510

1515

1520

Wat

er -L

evel

Ele

vatio

n (fe

et)

21-35-702Haskell County

base of well

Jan-

80Ja

n-81

Jan-

82

Jan-

83Ja

n-84

Jan-

85

Jan-

86Ja

n-87

Jan-

88Ja

n-89

Jan-

90

Jan-

91

Jan-

92Ja

n-93

Jan-

94Ja

n-95

Jan-

96

Jan-

97

Jan-

98Ja

n-99

Jan-

00

Jan-

01Ja

n-02

Jan-

03

Jan-

04

Jan-

05Ja

n-06

Jan-

07

Jan-

08

Jan-

09

Date

1625

1630

1635

1640

1645

1650

1655

1660

1665

Wat

er -L

evel

Ele

vatio

n (fe

et)


base of well

Jan-

80Ja

n-81

Jan-

82

Jan-

83Ja

n-84

Jan-

85

Jan-

86Ja

n-87

Jan-

88Ja

n-89

Jan-

90

Jan-

91

Jan-

92Ja

n-93

Jan-

94Ja

n-95

Jan-

96

Jan-

97

Jan-

98Ja

n-99

Jan-

00

Jan-

01Ja

n-02

Jan-

03

Jan-

04

Jan-

05Ja

n-06

Jan-

07

Jan-

08

Jan-

09

Date

1540

1545

1550

1555

1560

1565

1570

1575

1580

Wat

er -L

evel

Ele

vatio

n (fe

et)


base of well

Jan-

80Ja

n-81

Jan-

82

Jan-

83Ja

n-84

Jan-

85

Jan-

86Ja

n-87

Jan-

88Ja

n-89

Jan-

90

Jan-

91

Jan-

92Ja

n-93

Jan-

94Ja

n-95

Jan-

96

Jan-

97

Jan-

98Ja

n-99

Jan-

00

Jan-

01Ja

n-02

Jan-

03

Jan-

04

Jan-

05Ja

n-06

Jan-

07

Jan-

08

Jan-

09

Date

1380

1385

1390

1395

1400

1405

1410

1415

1420

Wat

er -L

evel

Ele

vatio

n (fe

et)

21-29-102Knox County

base of well

Jan-

80Ja

n-81

Jan-

82

Jan-

83Ja

n-84

Jan-

85

Jan-

86Ja

n-87

Jan-

88Ja

n-89

Jan-

90

Jan-

91

Jan-

92Ja

n-93

Jan-

94Ja

n-95

Jan-

96

Jan-

97

Jan-

98Ja

n-99

Jan-

00

Jan-

01Ja

n-02

Jan-

03

Jan-

04

Jan-

05Ja

n-06

Jan-

07

Jan-

08

Jan-

09

Date

1435

1440

1445

1450

1455

1460

1465

1470

1475

Wat

er -L

evel

Ele

vatio

n (fe

et)


base of well

Jan-

80Ja

n-81

Jan-

82

Jan-

83Ja

n-84

Jan-

85

Jan-

86Ja

n-87

Jan-

88Ja

n-89

Jan-

90

Jan-

91

Jan-

92Ja

n-93

Jan-

94Ja

n-95

Jan-

96

Jan-

97

Jan-

98Ja

n-99

Jan-

00

Jan-

01Ja

n-02

Jan-

03

Jan-

04

Jan-

05Ja

n-06

Jan-

07

Jan-

08

Jan-

09

Date

1395

1400

1405

1410

1415

1420

1425

1430

1435

Wat

er -L

evel

Ele

vatio

n (fe

et)


base of well

2135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748213574821357482135748

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21361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103213610321361032136103

Knox

Haskell

Baylor

ThrockmortonSto

new

all

Kin

g

June

197

5

Jan

1976

June

197

6

Jan

1977

June

197

7

Jan

1978

Date

1430

1435

1440

1445

1450

1455

Wat

er -L

evel

Ele

vatio

n (fe

et)

June

197

5

June

197

6

June

197

7


base of well

June

200

2

June

200

3

June

200

4

June

200

5

June

200

6

June

200

7

June

200

8

Date

1470

1475

1480

1485

1490

1495

1500

1505

1510

Wat

er -L

evel

Ele

vatio

n (fe

et)

June

200

2

Jan

2003

June

200

3

Jan-

2004

June

200

4

Jan

2005

June

200

5

Jan

2006

June

200

6

Jan

2007

June

200

7

Jan

2008

June

200

8


base of well

June

197

5

June

197

6

June

197

7

June

197

8

June

197

9

June

198

0

June

198

1

June

198

2

June

198

3

June

198

4

June

198

5

June

198

6

Date

1565

1570

1575

1580

1585

1590

1595

Wat

er -L

evel

Ele

vatio

n (fe

et)


base of well


Cross-formational flow– Water-Level data on the TWDB website

Recharge– TWDB Bulletin 6209 (Ogilbee and Osborne, 1962) – Haskell and Knox County

report– Chloride concentrations in the unsaturated zone for various land cover (current

work by the BEG)

Recharge Estimates

LocationRise in Water

Level (ft)

Starting Year

Ending Year

Total Time

Specific Yield

Estimated Reharge

(in/yr)nr 60 1900 1933 33 0.15 3.27Rochester 4 2 0.15 3.60west of Rochester 25 25 0.15 1.80west of Rochester 30 25 0.15 2.16nr >16 1906 1918 12 0.15 >2.40west of Rochester 61 nrwest of Rochester 28 nrwest of Rochester 63 nrRochester 30 1900 1930 30 0.15 1.80nr = not reported

Recharge estimates from water-level rises reported in Ogilbee and Osborne (1962)

Ogilbee and Osborne (1962) suggest that “the development of the land for cultivationappears to have increased the opportunities for recharge and probably has decreasedthe amount of water lost by evapotranspiration.

Recharge Estimates (cont)

Setting Borehole Cl(P) Mean Minimum Maximu

mmm/yr in/yr mg/L m ft m m ft mg/L mg/L mg/L mm/yr in/yr

"Natural" Land CoverHAS03-07 626 24.6 0.401 5.79 19.00 15 49 4.0 13.0 10.7 6.1 17.2 26.8 1.1HAS04-27 629 24.8 0.401 5.94 19.49 15 49 3.7 12.2 47.4 23.0 71.9 6.4 0.3

Rain-Fed Agriculture Partly FlushedHAS03-07 657 25.9 0.408 2.9 9.51 15 49 3.5 11.5 33.8 13.8 60.6 10.0 0.4HAS04-27 633 24.9 0.409 9.14 29.99 15 49 5.6 18.2 17.2 6.2 49.6 22.0 0.9

Rain-Fed Agriculture Completely FlushedHAS03-01 627 24.7 0.404 6.1 20.01 15 49 6.1 20.0 15.5 3.1 27.5 21.0 0.8HAS03-02 627 24.7 0.404 2.51 8.23 15 49 2.5 8.2 12.9 5.9 28.6 25.6 1.0HAS03-03 630 24.8 0.404 6.1 20.01 15 49 6.1 20.0 21.2 5.9 74.3 19.4 0.8HAS03-04 627 24.7 0.403 3.66 12.01 15 49 3.7 12.0 8.1 3.4 21.9 41.6 1.6HAS04-30 633 24.9 0.411 4.57 14.99 15 49 4.6 15.0 7.2 6.4 9.3 36.6 1.4HAS04-31 633 24.9 0.41 3.66 12.01 15 49 3.7 12.0 6.1 5.1 7.7 43.9 1.7HAS04-32 635 25.0 0.408 9.75 31.99 15 49 9.8 32.0 15.0 5.5 30.5 22.5 0.9HAS04-25 632 24.9 0.409 12.19 39.99 15 49 12.2 40.0 18.7 4.1 65.6 27.1 1.1HAS04-28 628 24.7 0.403 10.36 33.99 15 49 10.4 34.0 19.9 5.8 58.6 20.6 0.8HAS04-24 632 24.9 0.409 9.6 31.50 15 49 9.6 31.5 10.0 3.6 41.5 38.6 1.5

Irrigated Agriculture Cl(P + Irr)HAS03-06 928 36.5 2.20 6.1 20.01 15 49 6.1 20.0 93.5 29.5 201.6 30.4 1.2HAS04-23 930 36.6 12.20 33.5 109.91 15 49 3.4 11.0 291.9 82.6 537.9 63.0 2.5HAS04-29 837 33.0 3.00 10.67 35.01 15 49 10.7 35.0 23.4 4.8 35.8 148.0 5.8HAS07-01 964 38.0 36.00 6.92 22.70 15 49 6.9 22.7 764.8 475.2 1268.4 70.8 2.8HAS07-02 968 38.1 103.00 6.4 21.00 15 49 6.4 21.0 2586.5 1917.9 3956.0 41.2 1.6HAS07-03 964 38.0 22.70 12.8 41.99 15 49 12.8 42.0 186.0 47.4 372.1 118.6 4.7

Estimated Recharge

Depth to WaterDepth Precipitation Flushed Depth

Preliminary estimates based on chloride concentrations in the unsaturatedzone – ongoing work by the BEG

Where does recharge go?

recharge

discharge to Permian

baseflow

spring discharge

water table ET pumping

Seymour

Permian


Natural discharge– Streams

Locations– TWDB website (major river GIS coverage)

Gain-loss– TWDB Report 218 (Preston, 1978) – Baylor County report

– SpringsLocations and Discharge Rates

– TWDB website– Brune (2002) – Springs of Texas, 2nd Edition– USGS (Heitmuller and Reece , 2003) – Database of Historical

Documented Springs and Spring Flow Measurements in Texas


Artificial discharge via pumping– Locations and Rates

TWDB pumping database

Monthly Variation in Irrigation Pumping

1 2 3 4 5 6 7 8 9 10 11 12Month

0

2,000

4,000

6,000

8,000

10,000

12,000

Pum

ping

(AFY

)

Baylor County

1 2 3 4 5 6 7 8 9 10 11 12Month

0

2,000

4,000

6,000

8,000

Pum

ping

(AFY

)

Haskell County

1 2 3 4 5 6 7 8 9 10 11 12Month

0

2,000

4,000

6,000

8,000

Pum

ping

(AFY

)Knox County

Additional Data for Refined Model

Recharge studies by the BEG– Soil physics– Environmental tracers– Groundwater age dating

Historic development of the saturated interval in the Seymour– Filling up of the Seymour resulting from changes in land use

Data not previously publicly available (stakeholder, etc.)– Hydraulic properties

Additional data received from the Rolling Plains GCD– Water levels

Ability to use data since 1997 is limited due to required transient calibration period of 1980 through 1997

– Soft data Where is the Seymour Aquifer more productive and less productive?Where is recharge into the Seymour Aquifer higher and where is it lower?What is the interaction between the Seymour and underlying Permian-age rocks? Where do the Seymour and Permian-age rocks interact?

A simplified representation of the hydrogeological features that govern groundwater flow in the Seymour– Hydrostratigraphy– Hydraulic properties– Recharge– Pumping– Boundaries

Refined Seymour GAM – Conceptual Model

Seymour Formation

Clear Fork Group

ModelLayer

1

ModelLayer

2

Northwest Southeast

Recent Alluvium

Seymour

Clear Fork

Recharge

Discharge (ET, springs, pumping)

River-Formation Interaction

Cross-Formational Flow

No-Flow Boundary

General-Head Boundary

Groundwater Flow Direction

from R.W. Harden & Associates (1978)

Refined Seymour GAM Modeling Process

Collection and analysis of dataDevelopment of a conceptual model Construction of the mathematical modelSimulate development of the Seymour Aquifer (i.e., filling up of the aquifer)Calibrate the model to transient conditions from 1980 through 1997 using monthly time stepsConduct a sensitivity analysis on major parametersDocument all aspects of the model

Model Limitations

The Seymour aquifer is heterogeneous vertically (sand, gravel, silt, clay), but is represented as one layer with average properties.Processes and timing related to the historical development of the Seymour Aquifer are largely unknown.Data available (e.g., water levels, pumping) is limited in some regions.The GAM is a tool for making groundwater availability assessments on a regional basis only. The GAM is not capable of predicting aquifer responses at small scales (e.g., individual wells).

Advantages of the Refined Model

Additional data– Well log data from the Rolling Plains GCD

StructureHydraulic conductivity

– RechargeWork being conducted by the BEG

Refined Grid– Improves horizontal to vertical aspect ratio and thus communication

between gridblocks– Should reduce the number of dry cells– Provides ability to incorporate more heterogeneity in structure and

hydraulic properties– Provides increased resolution of drawdown

Considers only one pod of the aquifer– Improves model accuracy– Improves model performance

Additional Data to Support Model.

Additional data is welcomedAdditional data must be received by November 13, 2008All data used in the refined model will become publically available at the end of the projectForward data to– Toya Jones

INTERA, Inc.1812 Centre Creek Dr., Suite 300Austin, Texas 78754(512) [email protected]

Refined Seymour GAM Schedule

Date DescriptionMarch, 2008 Project Start

January, 2009 Completion of Conceptual Model DevelopmentFebruary 12, 2009 Draft Conceptual Model Report to TWDB

June, 2009 Completion of Steady-State Model CalibrationJuly, 2009 Completion of Transient Model Calibration

September 10, 2009 Draft Model Report to TWDBNovember, 2009 TWDB Feedback on Draft Model ReportDecember, 2009 Model Training SeminarJanuary 7, 2010 Final Model Report to TWDB

Seymour Aquifer Refined GAM Stakeholders Advisory Forum #1

Munday, Texas October 23, 2008

Attendance List, Questions and Answers, Discussion

ATTENDANCE LIST

Name Affiliation Toya Jones INTERA, Inc. Shirley Wade Texas Water Development Board Wade Oliver Texas Water Development Board Andrew Chastain-Howley Water Prospecting and Resource Consulting Ray Brady RMBJ Geo, Inc. Mendy Shugart Texas Department of Agriculture Joe Shephard City of Seymour Mike McGuire Rolling Plains Groundwater Conservation District Sam Fare West Central Texas Municipal Water District

PRESENTATION

The Stakeholder Advisory Forum was held on Thursday, October 23, 2008 at 6:30 p.m. at the Perry Patton Community Center located at 131 West Cisco Street in Munday, Texas.

The presentation topics for this form included:

Groundwater availability modeling overview Basics of groundwater flow Basics of groundwater modeling Comparison of existing Seymour Aquifer groundwater availability model and refined

groundwater availability modeling for the Seymour Aquifer in Baylor, Haskell, and Knox counties

Review of data needed for groundwater modeling New well data from Rolling Plains Groundwater Conservation District Timelines and request for additional information Schedule for the refined groundwater availability model for the Seymour Aquifer in

Baylor, Haskell, and Knox counties.

The meeting concluded at 8.45 p.m.

A summary of questions, answers and other discussion is listed below.

QUESTIONS AND ANSWERS

Question: Toya Jones: Where are the springs within the model area? Answer: Mike McGuire: There are a few springs along the Brazos River, probably more in Baylor County. Question: Toya Jones: There are data gaps in the southeastern and northwestern parts of the model. Are these areas dry? Answer: Mike McGuire: These areas are generally weak producers. There is some water production in the southern Baylor County pod. In the western Knox/Baylor pod, there is only windmill water and in southeastern Knox and eastern Haskell county much of this area is dry. Question: Sam Fare: Why is the model only using pumping data from the period of 1980 to

1997?

Answer: Toya Jones and Shirley Wade: The TWDB has detailed pumping from this period

which has been validated.

Question: Andrew Chastain-Howley: Were there ever any pumping tests conducted on the United States Geological Survey monitoring well near Munday? Answer: Mike McGuire: No. However, the production well (21-35-702) close to this site has a long history of data and it may be possible to use those data for estimation of specific yield. Question: Toya Jones: Is there any feel for communication between the Seymour Aquifer and the underlying Permian strata? Answer: Mike McGuire: Little communication is suspected. Question: Toya Jones: What are the irrigation amounts in each of the counties? Answer: Numerous: 2,100 acres-feet in Baylor County, 39,000 acre-feet in Haskell and Knox counties.

Question: Andrew Chastain-Howley: Are there any flowing creeks within the aquifer area?

Answer: Mike McGuire: There is no year round surface flow over the Seymour.

Question: Ray Brady: Are there similar modeling plans for any of the other pods (such as

Collingsworth County)?

Answer: Shirley Wade: There are no plans for modeling other pods at this time. If

stakeholders wish these other areas to be reviewed then the local Groundwater Conservation

Districts should vocalize this need to the TWDB.

DISCUSSION

Mike McGuire: Well yields are not generally as strong in the younger sediments to the west of the main pod in Knox and Haskell counties. Numerous: The native vegetation predating human development was tall grass prairie. There was also some skepticism that the aquifer was completely dry at the beginning of the 20th Century. Toya Jones: The intention is to simulate the Seymour Aquifer filling up with water. The reports suggest that the aquifer filled up between 1900 and 1930. Note: No other suggested scenarios or methods were put forward at this time. Mike McGuire: With respect to recharge, the active area is between the cities of Rochester and Rule, where the Altus sandy loam soils are at the surface. The Natural Resources Conservation Service has completed soil surveys which may be of use for the recharge analysis. Sam Fare: In addition, the best soils for recharge are generally the best soils for agriculture and irrigation. Therefore, these areas will get return flows in addition to high natural recharge rates. The dry land farming is conducted mainly on the black clay soils (which have lower recharge potential). Toya Jones: Suggested that the consultant estimates recharge and then send it to stakeholders for review. Mike McGuire: Municipal pumping from the aquifer is only for the city of Seymour today.

All other municipalities are supplied by surface water from Miller Creek Reservoir, which

filled up in 1978.

Refined Groundwater Availability Model GAM) for the ... · Managed available groundwater...

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