ag%20mtg 5 31 12%20power%20point
DESCRIPTION
http://panhandlewater.org/2016-Planning-Docs/Ag%20mtg_5-31-12%20Power%20Point.pdfTRANSCRIPT
Panhandle Water
Planning Area
Alternative Approaches
Consideration of Legal Constraints in Demand Development
Demands
MAG
Supply
MAG
Supply
with
buffer
Panhandle Water
Planning Area
PANHANDLE APPROACH TO
IRRIGATION SUPPLIES
2011 Panhandle Area Regional Water Plan
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
Panhandle Water
Planning Area
Supply to WUGs / WWPs � Consider most limiting factor
� Geographical constraints
� Infrastructure
� Contracts
� Consider source
� Location
� Availability
� Quality
Panhandle Water
Planning Area
Comparison of Supply to Demand
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
Panhandle Water
Planning Area
2009 InteraGAM
Differences in Available Supply from 2004 Dutton GAM
Panhandle Water
Planning Area
COMPARISON OF MAGS, AVAILABLE
SUPPLIES AND IRRIGATION DEMANDS
2011 Panhandle Area Regional Water Plan
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
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
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?
Panhandle Water
Planning Area
METHODOLOGY FOR ASSIGNING
WATER SUPPLY
Agricultural Water User Groups
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
Panhandle Water
Planning Area
Irrigation Zones
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
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
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?