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David H. DeJong, Ph.D.Director, Pima-Maricopa Irrigation Project
WRRC: “Arizona Runs on Water”Gila River Indian Community: Innovative Solutions to Manage
Multiple Water Resources
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Managing conjunctive water
resources via managed aquifer
recharge and utilization of
groundwater.
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P-MIP is being constructed on the
shoulders of a 2,000 year history of
irrigated agriculture in central Arizona
History
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Arizona Water Settlements Act of 2004
Opportunity
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Declining agricultural production in central Arizona
5
County Acres
1982
Acres
2012
Decline Percent
Drop
Maricopa 1,429,539 475,898 953,641 66.7%
Pinal 2,403,901 1,174,727 1,229,174 51.1%Opportunity
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The Pima-Maricopa Irrigation Project
P-MIP
135 miles completed
150 miles remaining
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System improvements from this …
P-MIP
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To a start-of-art systemP-MIP
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The Community has nine discrete sources of
water
CAP NIA and Indian
SRP
Haggard Decree
Groundwater
P-MIP
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Nine different sources of water with varying:
costs
quantity
quality
reliability
Geographical delivery restrictions
How to balance groundwater demands
Water Resources include
P-MIP
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Comprehensive Water Management Plan
CWMP
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Goal
Protect the quantity and quality of
Community land and water resources
to ensure sustainable utilization for
future generations via strategic
groundwater recharge and utilization.
CWMP
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Long term Groundwater Balance
CWMP
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Olberg Dam Underground Storage Facility
January 1, 2015 (before introduction of water)
MAR
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First Water August 2015
MAR
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Over 25,000 AF stored since 2015
MAR
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The second MAR site
MAR
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0
40
80
120
0 50 100 150
De
pth
to
Wa
ter
(fe
et)
Years
No MAR
Min Recharge
Max recharge
Simulated Hydrograph
MAR
MAR to protect groundwater
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