Download - SNAKE RIVER GROUND WATER TRANSFERS Climate Impacts Group May 13, 2003 Don Reading Richard Slaughter
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SNAKE RIVER GROUND WATER TRANSFERS
Climate Impacts Group
May 13, 2003
Don Reading
Richard Slaughter
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I. The Setting
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Snake River Basin
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1000 Springs Flows
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Idaho Water Markets• Rental Pools - storage water; local committees and
tribe– Water District 1 (Upper Snake)
– Water District 63 (Boise)
– Water District 65 (Payette)
– Shoshone Bannock (American Falls & Pocatello)
• Water Supply Bank - Natural Flow (both surface and ground)– IDWR Board/Director
• Transfers (both surface & ground)– IDWR Board/Director
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II. The Problem
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No more ignoring the obvious: Idaho sucks itself dry
High Country News - February 20, 1995
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Water Level Change In Feet
Idaho Falls
Pocatello
Twin Falls
Arco
Ashton
-25
-20
-15
-10
-5
0
5
10
15
Eastern Snake River PlainGround Water Level Change MapSpring of 1980 to Spring of 2002
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Water Level Change In Feet
Idaho Falls
Pocatello
Twin Falls
Arco
Ashton
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
Eastern Snake River PlainGround Water Level Change Map
Spring of 2001 to Fall of 2001
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“Calls”
A “Call” is a request by a water right holder to fulfill the full amount of their water right.
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A. Musser Call (1993) B. A&B Irrigation Call (1995) C. IDWR ‘Curtailment’ & Stipulation (2001)
1. Basin 35 – Twin Falls, North Side
2. Basin 36 – Clear Springs Foods
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III. The Solution
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Modification of Market Rules
North Snake Ground Water District Project
IDWR Ground Water Model
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EASTERN SNAKE RIVER PLAIN HYDROLOGIC EFFECTS SPREADSHEET
Developed by D. Cosgrove and G. Johnson, Idaho Water Resources Research Institute, University of Idaho with support from the U.S. Bureau of Reclamation's Snake River Resources Review ProjectJune, 2000
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Purpose and Scope
This spreadsheet has been developed to assist in conjunctive management of Idaho’s water resources.
The spreadsheet provides quantitative estimates of the effects associated with ground water pumping and managed recharge in the Eastern Snake River Plain.
Effects are reflected as changes in spring discharge or river gains and losses in the Snake River between Heise (or Ashton on the Henrys Fork of the Snake River) and King Hill.
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Numerical Example of Ground Water Transfer
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Effect within reach – year of transfer (acre feet)
Withdrawal Aquifer Depletion
“FROM” Well 100 50
“TO” Well 100 60
“FROM” well cease production“TO” well may or may not begin withdrawal
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Hydrologic Response--Neeley to Minidoka Reach
-8.000
-6.000
-4.000
-2.000
0.000
2.000
4.000
6.000
8.000
Acre
Fee
t per
Trim
este
r
Net Effects
Pumping Effects
Recharge Effects
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Effect within reach – 10 years after transfer
Withdrawal Aquifer Depletion
“FROM” Well 100 30
“TO” Well 100 60
Aquifer depletion in year 10 90
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Therefore net aquifer depletion – in year 10 is 40 acre feet
[Original 50 “FROM” well & 90 in year 10 ; 90 – 50 = 40]
Therefore in year 10 need “make-up” water of 40 acre feet
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What can the “TO” well pump in year 10 ?
Let the reduction in the “TO” well by R
40 acre feet needs to be “made-up”
Therefore:40 = .6*R
or R = 40/.6 = 66.67
Hence the purchaser of the “TO” well can withdraw 33.33 acre feet in year 10; but would have purchased 100 acre feet.Each year may be different.
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•“TO” well may be idle for “X” years after transfer.
•After “Z” years the system will be assumed stable.
•Credits may accrue to out of reach gains.
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Water Price Differences (acre foot)
• Idaho Rental Pools and Bank: $2.95 - $10.50
• BoR fish flush: $50 - $100
• Metro Water of Southern California: $82 - $294
• Desalination: $1,500 - $2,500
• Grand Canyon vacation home development: $16,800
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Gross Revenue from 1 AFSnake River Plain
• Aquaculture $14• Surface diversion for agriculture $100• Groundwater for agriculture $200• Groundwater for municipal $400 • Groundwater for Dairy $45,000• Groundwater for industrial > $50,000
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Improved Economic Efficiencies
• Eliminates third party effects
• Reduces transactions costs
• Adds certainty for purchaser and seller