Simulated Surface water – Groundwater Interaction for ...€¦ · Simulated Surface water –...
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Simulated Surface water – Groundwater Interaction for Brazos River Alluvium
January 29, 2019
Presented To:
GMA 12
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Agenda
• Introductory Information
• Desired Future Conditions (DFCs) and Modeled Available Groundwater (MAGs)
• Conceptualization of Groundwater Flow in Alluvium
• Model Results from Brazos River Alluvium GAM and Update Sparta/Queen City/Carrizo-Wilcox GAM
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Brazos River Alluvium: Areal Extent
GMA Total Burleson 12 130 130
8 312 1912 6114 36
Robertson 12 132 132
Milam
Brazos
County GMA Area (sq. miles)
22
97
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Brazos River Alluvium: Thickness
MILAM
BRAZOS
ROBERTSON
BURLESON
Brazos AlluviumThickness (ft)
0 - 20
21 - 40
41 - 60
61 - 80
81 - 100
101 - 120
121 - 160
0 10 205Miles
ÜNote: Thickness = ground surface – base
of aquifer (from Shah and Houston, 2007)
Maximum Thickness
GMA Area Total Area GMABurleson 12 55 55 113
8 55 12912 49 14712 58 12514 59 119
Robertson 12 54 54 104
County GMA Average Thickness
Milam 51
Brazos 58
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Brazos River Alluvium Water Level Data: Burleson County
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Brazos River Alluvium DFCs
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Brazos River Alluvium: Estimated Average Saturation Faction
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MILAM
BRAZOS
ROBERTSON
BURLESON
Average Saturation Fraction
!. 0.38 - 0.40!. 0.41 - 0.50!. 0.51 - 0.60!. 0.61 - 0.70!. 0.71 - 0.80!. 0.81 - 0.90!. 0.91 - 1.00
MILAM
# wells Avg value # wells Avg
valueBrazos 8 0.51 8 0.46
Burleson 54 0.68 44 0.61Milam 2 0.48 2 0.49
Robertson 11 0.60 11 0.59Overall 75 0.57 65 0.54
Avg Saturation Fraction
Min (winter) Saturation Fraction
Note: Saturation thickness = saturation fraction * total thickness
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Brazos River Alluvium MAGs (AFY)
• TWDB GAM RUN 17-030 MAG (AFY) Report (TWDB, 2017)
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SW-GW Interaction • Under natural conditions, groundwater should be recharging
major streams in GMA 12 • Two important interactions: Stream and alluvium; alluvium
and underlying aquifer • For well in alluvium what is the source of the water?• For well in underlying aquifer, what is the source of water that
is pumped?
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SW-GW Interaction– No Pumping
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SW-GW Interaction– Pumping
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Brazos River Alluvium GAM: Conceptual Model
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Updated Sparta/Queen City/Carrizo-Wilcox GAM: Conceptual Model
Vertical Layering– added two layers – river alluvium and a shallow groundwater flow zone
River Alluvium
Shallow Flow Zone
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Water Budget for Brazos River for Pumping and No Pumping Conditions
• Under No pumping conditions, Brazos River gains about 40,000 AFY consistently • Under pumping conditions, Brazos River gains about 20,000 AFY until year 2000 • At about 2010, Brazos becomes a losing stream. DFC runs cause stream to lose 65,000
AFY
No Pumping Pumping
alluvium & stream
alluvium & underlying aquifer
alluvium & stream
alluvium & underlying aquifer
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Brazos Alluvium: Burleson County
alluvium & stream
alluvium & underlying aquifer
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Brazos Alluvium: Milam County
alluvium & stream
alluvium & underlying aquifer
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Brazos Alluvium: Brazos County
alluvium & stream
alluvium & underlying aquifer
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Brazos Alluvium: Robertson County
alluvium & stream
alluvium & underlying aquifer
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BRAA GAM and Central SP/QC/CW GAM Differ with Cross-Flow Between Alluvium and Underlying Aquifer
Cross-flow (AFY) between Brazos Alluvium and Underlying Aquifer
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Issues of Potential Interest to GMA 12• DFC other than percent saturation? • Additional monitoring?• Which GAM to used for DFC calculations? • Options for Estimating Pumping Rates and Locations – Historical– Future
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QUESTIONS ?
Questions ?