Ag%20mtg 5 31 12%20power%20point
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Transcript of Ag%20mtg 5 31 12%20power%20point
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Panhandle Water
Planning Area
Alternative Approaches
Consideration of Legal Constraints in Demand Development
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Demands
MAG
Supply
MAG
Supply
with
buffer
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Panhandle Water
Planning Area
PANHANDLE APPROACH TO
IRRIGATION SUPPLIES
2011 Panhandle Area Regional Water Plan
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Panhandle Water
Planning Area
Source Availability
� Ogallala Availability
� 40/50/80 Approach
� 2004 Northern GAM Model
� Calculated for each 1 sq mi grid
� Rita Blanca
� Included as part of Ogallala
� Dockum, Seymour, Blaine
� 1.25% decline in storage
� Reservoirs
� Safe Yields
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Panhandle Water
Planning Area
Supply to WUGs / WWPs � Consider most limiting factor
� Geographical constraints
� Infrastructure
� Contracts
� Consider source
� Location
� Availability
� Quality
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Panhandle Water
Planning Area
Comparison of Supply to Demand
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Panhandle Water
Planning Area
Comparison of Supply to Demand
� 27 WUGs with Identified Shortages
� 454,726 Acre-Feet in 2010
� 487,957 Acre-Feet in 2030
� 419,780 Acre-Feet in 2030
� 99% attributed to Irrigation in 2010, 91% in 2060
� Limitations of availability in irrigation areas
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Panhandle Water
Planning Area
2009 InteraGAM
Differences in Available Supply from 2004 Dutton GAM
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Panhandle Water
Planning Area
COMPARISON OF MAGS, AVAILABLE
SUPPLIES AND IRRIGATION DEMANDS
2011 Panhandle Area Regional Water Plan
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Panhandle Water
Planning Area
Irrigation Supplies
0
100,000
200,000
300,000
400,000
500,000
600,000
Dallam Hartley Sherman Moore
Groundwater Supplies, Year 2010
2004 Dutton GAM Intera GAM MAG
Irrigation Demand Irrigation Supply
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Panhandle Water
Planning Area
Irrigation Supplies
0
100,000
200,000
300,000
400,000
500,000
600,000
Dallam Hartley Sherman Moore
Groundwater Supplies, Year 2060
2004 Dutton GAM 2009 Intera GAM MAG
Irrigation Demand Irrigation Supply
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Panhandle Water
Planning Area
Discussion� Do we limit demands based on
supplies?
� No demand > MAG
� Do we modify approach to assigning irrigation supplies?
� Are there other demand considerations?
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Panhandle Water
Planning Area
METHODOLOGY FOR ASSIGNING
WATER SUPPLY
Agricultural Water User Groups
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Panhandle Water
Planning Area
Supply to Ogallala WUGs
� Used GAM to assist with irrigation and municipal users
� Irrigation Users
� Lesser of GAM or demands
� Livestock Users
� Met demands
� Greater flexibility in moving to areas with water than irrigated agriculture
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Panhandle Water
Planning Area
Irrigation Zones
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Panhandle Water
Planning Area
Irrigation Supplies-Current Methodology
� Conservative Approach
� 1 mi2 grid – competition for water
� Limits supply in time and space
� 54 one-year simulations
� Water will flow to irrigation wells from outside grid area (how far?)
� May not correspond to GCD permitting
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Panhandle Water
Planning Area
Irrigation Supplies-Current Methodology
� Captures intent of DFC
� Limits geographical extent of supply allocation
� Allows additional supply to be developed by others
� Protects other landowner rights
� Simply a plan
� No legal implications
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Panhandle Water
Planning Area
Discussion� Do we modify approach to
assigning irrigation supplies?
� Continue to use GAM?
� Add a buffer?
� Modify temporal supplies (e.g., allow more use early in the planning period)?
� Do we modify approach to assigning livestock supplies?