1. SNAKE RIVER GROUND WATER TRANSFERS Climate Impacts Group May 13, 2003 Don Reading Richard Slaughter

2. I. The Setting

3. Snake River Basin

8. 1000 Springs Flows

9. 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

10. II. The Problem

11. No more ignoring the obvious: Idaho sucks itself dry High Country News - February 20, 1995February 20, 1995

15. “Calls” A “Call” is a request by a water right holder to fulfill the full amount of their water right.

16. 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

19. III. The Solution

20. Modification of Market Rules North Snake Ground Water District Project IDWR Ground Water Model

22. 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.

29. 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

32. 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

33. Gross Revenue from 1 AF Snake 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

34. Improved Economic Efficiencies Eliminates third party effects Reduces transactions costs Adds certainty for purchaser and seller