Groundwater modelling study for sustainable water management in Town of High River. Han Sang-Yoon WaterTech, April 12, 2013
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1 Groundwater modelling study for sustainable water management in Town of High River Han Sang-Yoon WaterTech, April 12, 2013
2 Acknowledgements Town of High River: Reiley McKerracher Jasen Craigie Project Team: Francisco Castrillon-Munoz, M.Sc, P.Geo (Project Manager) Sang-Yoon Han, Ph.D. Shlomo Orr, Ph.D. Andrew Hinnell, Ph.D. Charles Dourado, B.Sc.
3 Outline Data Collection Site Location Objectives Conceptual Model Hydrogeological Conceptual Model Data Sources Groundwater Model Structure Hydraulic Parameters/Boundary Conditions Sufficient Data YES Code Selection NO Model Calibration (steady-state and transient) Model Construction Scenario Simulations Conclusions Calibration & Sensitivity Predictive Simulations 3
4 Site Location
5 Objectives Support a sustainable water management plan for the Town; Determine sustainable yield of the well field in the aquifers underlying and abutting the Town; Assessment of surface water/groundwater interactions from current and (proposed future) wells; Quantitatively predict/estimate effects of pumping by different sectors, under different climatic scenarios; Identify additional data needs.
6 Data Sources 1,637 wells records selected from the well database (ESRD) Surficial and consolidated geological maps (AGS); Regional scale geological and hydrogeological studies (ARC); Hydrogeological investigation reports commissioned by the Town of High River; Base map (IHS Accumap 2011); Digital elevation model (CCG); Surface water monitoring (WSC); and Town well field operational data (Town of High River); 6
7 Hydrogeological Conceptual Model What is a hydrogeological conceptual model? Defines the structure of the system; Defines the hydraulic properties and flow mechanisms; Defines the water inputs and outputs; 7
8 Hydrogeological Conceptual Model Hydrogeological Conceptual Model 8
9 Limitations and Assumptions Model provides a simplified representation of the real system Hydraulic parameters were averaged over zones of relatively uniform characteristics Quick recovery rates in pumping wells consistent with fairly direct hydraulic communication with the river 9
10 Code Selection Three-Dimensional groundwater model Simulate flow & yield in main aquifers Predict effects of natural (climatic change) & artificial (pumping) stresses FEFLOW 6.0 Finite element flow and transport code (WASY, GmbH) Flexibility in gridding Groundwater density, and coupled solute transport and heat
11 Model Structure Lithological Unit Aquifer/Aquitard Model Layer Surficial Deposit Aquitard 1 Model construction Model domain 840 km 2 ; Six layer model; Element size (horizontal) 30 m 2 to 0.1 km 2 ; and, Denser finite element mesh near town. Sand and Gravel Aquifer 2 and 3 Confining Unit 1 Aquitard 4 Confining Unit 2 Aquitard 5 Interbedded Sandstone Aquifer 6 Town of High River 11
12 Hydraulic Conductivity Distribution Sand and Gravel Aquifer 12
13 Boundary Conditions Sand and Gravel Aquifer 13
14 Model Calibration Steady State Calibration 39 groundwater levels in the sand and gravel aquifer, and 94 groundwater levels in the sandstone aquifer For pre-pumping conditions, oldest data used as calibration targets Regional Town 14
15 Model Calibration Steady State Calibration Regional hydraulic head distribution in the sand and gravel unit High River Hydraulic Head (masl) 15
16 Model Calibration Steady State Calibration Regional hydraulic head distribution in the sandstone aquifer High River Hydraulic Head (masl) 16
17 Model Calibration Transient Calibration Focus on representing aquifers response to pumping around Town Simulated vs. to observed responses in 12 town wells 17
18 Calibrated Hydraulic Parameters Hydraulic conductivity and recharge rate Lithological Unit Horizontal hydraulic conductivity [Kxy] (m/s) Vertical hydraulic conductivity [Kz] (m/s) Recharge (mm/y) Surficial Deposit (above sand and gravel) 1.0x10-6 to 1.5x x10-7 to 2.0x to 40 Surficial Deposit (clay and till) 1.0x x10-8 less than 1 Sand and Gravel 1.0x10-7 to 2.0x x10-7 to 2.0x Confining Unit 1 1.0x10-9 to 1.0x x10-10 to 1.0x Confining Unit 2 1.0x10-9 to 1.0x x10-10 to 1.0x Interbedded Sandstone 5.0x x Specific storage value of 1x10-4 m -1 and a effective porosity of 0.2 were assumed for the entire model domain. 18
19 Groundwater Drawdown End of / 2010 simulated groundwater drawdown in sand and gravel aquifer Simulated using operational data Groundwater drawdown is less than 3 m. End of
20 Contribution of Various Components Source of water withdrawn by Town wells Simulated for 2010 using operational data. 20
21 Scenarios Simulation period from 2010 to 2040 (30 years) Scenarios with various pumping rates and number of wells 12 well scenarios - Scenario 1 (4.9 Mm3/y) - Scenario 2 (7.2 Mm3/y) 15 well scenarios - Scenario 3 (4.9 Mm3/y) - Scenario 4 (7.2 Mm3/y) 21
22 River Contribution on Pumping Predicted river contribution with increased withdrawals Scenario 1 12 wells (4.9 Mm 3 /y) Scenario 2 12 wells (7.2 Mm 3 /y) Scenario 3 15 wells (4.9 Mm 3 /y) Scenario 4 15 wells (7.2 Mm 3 /y) Withdrawal 4.6 Mm 3 /year 4.9 Mm 3 /year 7.2 Mm 3 /year 4.9 Mm 3 /year 7.2 Mm 3 /year % GW originating from river % of minimum monthly river flow
23 Groundwater Drawdown (end of 2040) 12 well scenarios Scenario Scenario 2 23
24 Groundwater Drawdown (end of 2040) 15 well scenarios Scenario Scenario 4 24
25 Predictions Climate Change Shifts in Climate Simulated climate change scenarios indicate relatively low impact on the groundwater system if river flow is still maintained
26 Conclusions Current groundwater use no major impact on the groundwater system 70% of produced water originates from surface water With continuous pumping for next 30 years, river contribution over 80% Flow from the river to the aquifer equals 30% of monthly minimum river flow when pumping rate of 7.2 Mm 3 /y was simulated Climate change scenario* relatively low impact on the groundwater system * Assuming that river contribution to groundwater remains constant
27 27
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