iowa’s jordan...iowa’s jordan aquifer: current status and future conditions bob libra state...
TRANSCRIPT
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Iowa’s Jordan Aquifer:
Current Status and Future Conditions
Bob LibraState Geologist of Iowa
Iowa DNR – Geological Survey
Cambrian, Jordan Sandstone
McGregor, Clayton Co.
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Managing our Water Resources
• What Are Our Water Resources?
• How Much Water Do We Have?
• How Much Water Do We – Will We - Use?
• Is it Sustainable for the Long Term?
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Need for a Water Resource Management Program
• Characterization of our Major Aquifers and Watersheds out of date.
• Energy - Related Water Impacts
• Climate Change and Water Impacts
• Allocation and Planning Beyond One Permit at a Time.
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Water Management-A Comprehensive Program
• Updated Assessment of Current Demand:-- Last Major Use Assessments, by Aquifer and Watershed, in 1995.
• Resume and Enhance Groundwater Level Monitoring:-- Regional Aquifer Trends and Local Hotspots.
• Add and Maintain Additional Stream Gages:-- Gages needed for accurate surface water allocation, reservoir studies.
• Updated Assessments of Aquifers—Geologic and Hydrologic Properties:-- Last Major Efforts in the 1960’s – 1980’s.
• Upgraded Assessment Techniques:-- Need to Utilize Modern Modeling and Predictive Analysis.
• More Thorough Hydrogeologic Reviews of Permits:-- Well/Stream Interference and Sustainability Questions. Assistance in
Drought and Conservation Planning for Water Supplies.
• Update the State Water Plan—The Road Map for Water Use:-- Last update in 1985. Do our rules, regs, policies need reworking?
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Water Resource Management forLong-Term Sustainability
Original Water Resource Management Program Proposal -- $1.65 M annuallyDNR Strategy -- $2M for FY10
Legislative Appropriation --$480K FY08 ($495K FY’s 09 and 10)Water Allocation Permit Fees – up to $500K annually
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Main Activities
• Developed aquifer characterization methodology.
• Data Mining – Characterization of Dakota Sandstone and Jordan Aquifers.
• Predictive Models developed for Dakota and Jordan Aquifers.
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What is the Jordan Aquifer?
Cambrian, Jordan SandstoneMcGregor, Clayton Co.
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What is the Jordan Aquifer?
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Analysis and Interpretation
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Water Withdrawals, Aquifer Tests, GW Quality Data….
Locations, Analysis, Specific Sources
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Geology, Aquifer Properties, Groundwater Elevations, Recharge, Pumping History….……..all go in here:
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Jordan Aquifer: Long Term Use – ―Memory‖ – Pumping History NeededUSGS Model Efforts late 70’s - early 80’s archived older data
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Locations of Water Use Permits for Wells tapping the Jordan Aquifer
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The Jordan is a“Confined Aquifer”
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What has occurred since we started using the Aquifer?
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Pumping results in lowering or “drawdown” of the pressure
surface.
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Pre-Development
Groundwater Elevation
<500 ft
500-550 ft
550-600 ft
600-650 ft
650-700 ft
700-750 ft
750-800 ft
800-850 ft
850-900 ft
900-950 ft
950-1000 ft
1000-1050 ft
1050-1100 ft
1100-1150 ft
1150-1200 ft
>1200 ft
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1960
Groundwater Elevation
<500 ft
500-550 ft
550-600 ft
600-650 ft
650-700 ft
700-750 ft
750-800 ft
800-850 ft
850-900 ft
900-950 ft
950-1000 ft
1000-1050 ft
1050-1100 ft
1100-1150 ft
1150-1200 ft
>1200 ft
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1990
Groundwater Elevation
<500 ft
500-550 ft
550-600 ft
600-650 ft
650-700 ft
700-750 ft
750-800 ft
800-850 ft
850-900 ft
900-950 ft
950-1000 ft
1000-1050 ft
1050-1100 ft
1100-1150 ft
1150-1200 ft
>1200 ft
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2007
Groundwater Elevation
<500 ft
500-550 ft
550-600 ft
600-650 ft
650-700 ft
700-750 ft
750-800 ft
800-850 ft
850-900 ft
900-950 ft
950-1000 ft
1000-1050 ft
1050-1100 ft
1100-1150 ft
1150-1200 ft
>1200 ft
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Sustainability Criteria:
IAC 567 Chapter 52.4(3)c.
Two hundred (200) foot limit on the decline
of groundwater piezometric levels. The
maximum collective long-term decline in
groundwater piezometric levels in the
Cambrian Jordan Sandstone Aquifer in any
high use area will not be permitted to
exceed 200 feet from the 1977 baseline as
determined from available records of the
department’s Iowa Geological Survey (IGS).
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Horick and Steinhilber 1978 Potentiometric surface
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Drawdown from Horick and Steinhilber (1978) Compared to 2007 Simulated
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Predictive SimulationsDrawdown based on Horick and Steinhilber (1978)
potentiometric map
2009-2029
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Constant Pumping rates 2009-2029
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25% Increase in Pumping Rates 2009-2029
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50% Increase in Pumping Rates 2009-2029
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Modeling Needs Projections of Future / Planned Use
Example: City of Marion
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Land surface
0
20
40
60
80
100
120
140
160
180
200
Depth
belo
w landsurfa
ce (
feet)
sand 180-199
swl=68 feet
50%=124 feet
Sustainability Criteria:
--One allowable drawdown for the entire Aquifer (i.e., 200 feet from 1977?)
--Percent of original “Pressure Head”?
--MN DNR uses Pressure (Available) Head approach. At 50% loss, submit a plan to assure Available Head will not fall below 25% of original.
--MN DNR applies this at the well, not in a mapped zone around it.
Pressure
Head
25%=152 feet
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Consequences?
• Quantity and Production Capability: How much should be reserved for the long term?
• What do we mean by long term? Life of investments? 100 years? “Forever”?
• Pumping Costs: Estimated increase of $25K annually for a 500 GPM well with 200 feet of additional drawdown.
• Quality Impacts: Vertical and Lateral GW Movement are a question of concern.
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Jordan Status – Future Conditions
• Pressure Surface – Well Levels have declined 150 ft over a broad area of Central IA, and over 250 ft locally.
• With no increase in use, Well Levels will exceed the 200 ft drawdown limit locally.
• With a 50% increase in use, Declines of over 450 ft will occur locally, about ½ of the original available head.
• Quality Impacts a concern that needs to be addressed.
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Reports, Data, Model Input Files are Available on the IGWS Website at:
• http://www.igsb.uiowa.edu/
Additional Information on Water Quantity/Supply Issues is Available at :
• http://www.iowadnr.gov/water/quantity.html
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FY10: West Nishnabotna Alluvial Aquifer•GW-SW Interactions come into play
•Drought – Climate Impacts •Water Quality – Source Water
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Additional Program Needs• Expand GW level network
• Build and maintain stream gages
• Create Water Resource data-base and web applications
• Input/Refinement of Future Use Estimates
• Additional characterization support needed
– 3D Aquifer mapping (alluvial systems)
– Quality – Pumping relationships
– Geologic characterization
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Goal: Break the Cycle
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Water Resource Sustainability:
Assuring plentiful, clean water for community, business, and ecological needs, today and into the future.
Questions?
Bob Libra, State Geologist
Mike Gannon, Hydrogeologist
DNR -- Iowa Geological Survey
319-335-1575
http://www.igsb.uiowa.edu/