San Carlos Apache Water Delivery Project

1. San Carlos Apache Water Delivery Project David Neumann June 18, 2003

2. Tribe’s Existing Black River pump station Outline • Company background • Project background • Problem definition • Proposed approach • Optimization • Operations model • Summary

3. Wrong Stetson! Who are the Stetson Engineers? • We design, test, and manufacture fine hats

4. Established in 1958 Offices in California and Arizona 60 employees Clients include: Indian tribes, water districts, state, federal, local governments Engineering services include: Surface water Agricultural Water rights Groundwater Environmental Municipal Stetson Engineers

5. What is the San Carlos Apache Water Delivery project • Develop up to 77,000AF/year of CAP and other waters for agriculture and other uses • We have been tasked to: • Develop and evaluate alternative delivery plans

6. Project Location

7. Water Delivery Project Goals • Develop an irrigation project that has the lowest cost and highest benefit • Fully use water rights and funding provided by the government • Develop various parts of the reservation

8. Work Timeline • Completed: • Reconnaissance analysis • Appraisal analysis • Determined three concept alternatives • Next Step: • Feasibility study • Detailed environmental impacts analysis (EIS/EIR)

9. Project Alternatives • Three alternatives consist of: • Pumping stations • Distribution pipelines and canals • On and off stream reservoirs • Groundwater recharge and pumping • Pass-through reservoirs

10. Project DescriptionAlternative 1

11. Problem definition • We need tools to: • Further investigate project sizing and operating policy • Analyze the impacts of the projects on • Hydrology • Water quality

12. Two models • Optimization – Prescriptive: Calculate best project sizes and operations to meet a flow criteria • Operations – Descriptive: Calculate storage and flows given project size and operations

13. Optimization Model • Use an efficient algorithm to get the most cost-effective project sizes and number of acres to irrigate • Start with a loosely constrained model • Add constraints to see their effect

14. Optimization layout

15. Problems with the optimization Model • Time step • Perfect foresight • Simplified operating rules • Linearization errors

16. RiverWare Operations Model • Operations model will take the project sizes from the optimization model • Verify that sizing criteria has been met • Determine impacts

17. RiverWare Model development • Model and rules are under development • Difficult to write rules when project operations are unclear • First, develop operating goals • Resulting rules are not very complicated except: • Exchange mechanism • Pumping priority and water rights • Multiple diversions from same object

18. RiverWare workspace

19. Operations Model • Analyze impacts on: • Flow timing and magnitude • Reservoir storage • Minimum flows • Water quality

20. Water Quality • Total dissolved solids • Temperature • Dissolved oxygen • RiverWare?

21. Proposed approach • Determine project operations • Optimize project sizes and irrigated acreage • Run operations model • Verify project sizes and operations • Repeat steps 1 – 4 until project sizes and operations are finalized • Investigate hydrologic impacts • Investigate water quality impacts

22. Additional technical issues • Ungaged flow development • 50 years of daily data • Organizing model inputs, runs, and results • 4 Alternatives including No Action • 4 RiverWare models • 4 RiverWare rulesets • 3 Optimization models

23. Summary • Develop a water delivery system for the San Carlos Apache Tribe • Will use the following modeling tools: • An optimization model to size projects and determine number of acres to irrigate • A RiverWare operations model to verify optimization and analyze impacts for an EIS/EIR

24. Questions? Coolidge Dam and San Carlos Reservoir