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  • r Basin Study

    Out

    randum

    /IQ, Task 2.1

    Yakima Riv

    Water Needs for

    Technical Mem

    U.S. Bureau of ReclamatioContract No. 08CA10677A I

    Yakima Riveer Basin Study

    Water Needs for Out-of-Stream Uses

    Technical Memoorandum

    U.S. Bureau of Reclamation n Contract No. 08CA10677A IDD/IQ, Task 2.1

    Prepared by HDR Engineering, Inc Anchor QEA

    U.S. Department of the Interior State of Washington Bureau of Reclamation Department of Ecology

    Pacific Northwest Region Office of Columbia River June 2011 Columbia-Cascades Area Office

  • MISSION STATEMENTS

    The mission of the Department of the Interior is to protect and

    provide access to our Nations natural and cultural heritage and

    honor our trust responsibilities to Indian tribes and our

    commitments to island communities.

    The mission of the Bureau of Reclamation is to manage, develop,

    and protect water and related resources in an environmentally and

    economically sound manner in the interest of the American public.

    The Mission of the Washington State Department of Ecology is to

    protect, preserve and enhance Washingtons environment, and

    promote the wise management of our air, land and water for the

    benefit of current and future generations.

  • Yakima River Basin Study

    Water Needs for Out-of-Stream Uses

    Technical Memorandum

    U.S. Bureau of Reclamation Contract No. 08CA10677A ID/IQ, Task 2.1

    Prepared by

    HDR Engineering, Inc Anchor QEA

    U.S. Department of the Interior State of Washington Bureau of Reclamation Department of Ecology

    Pacific Northwest Region Office of Columbia River June 2011 Columbia-Cascades Area Office

  • This Page Intentionally Left Blank

  • Contents 1.0 Introduction ......................................................................................................... 1

    1.1 Background .......................................................................................................... 1

    1.2 Study Area ........................................................................................................... 2

    1.3 Terminology ......................................................................................................... 4

    1.4 Objectives of the Water Needs Assessment ........................................................ 5

    2.0 Summary of Findings ......................................................................................... 6

    3.0 Current Agricultural Needs Federally Supplied ............................................ 7

    3.1 Yakima Project Entitlements and Diversions ........................................................ 8

    3.2 Return Flow ....................................................................................................... 11

    3.3 Irrigated Acreage in the Yakima Project ............................................................. 12

    3.4 On-Farm Water Needs ....................................................................................... 14

    3.5 Conveyance Losses ........................................................................................... 17

    3.6 Preliminary Water Balance for Yakima Project Divisions .................................... 18

    3.7 Water Needs in Drought Years .......................................................................... 19

    4.0 Current Agricultural Needs Not F ederally Supplied .................................. 29

    4.1 Method for Estimating Non-Federally Supplied Agricultural Use ........................ 29

    4.2 Results for Non-Federally Supplied Agricultural Use .......................................... 30

    5.0 Future Changes in Agricultural Needs ........................................................... 32

    5.1 Effects of Land Conversion from A gricultural to Urban Uses .............................. 32

    5.2 Agricultural Conservation ................................................................................... 32

    5.3 Idle Acreage ....................................................................................................... 33

    5.4 Potential Variability in Cropping Patterns ........................................................... 34

    5.5 Climate Change Effects on Agricultural Water Needs ........................................ 36

    6.0 Municipal and Domestic Water Needs ............................................................ 38

    6.1 Method for Assessing Current Municipal and Domestic Needs .......................... 38

    6.2 Current and Projected Population ...................................................................... 39

    6.3 Current Water Use Estimates Municipal Systems and Individual Domestic

    Wells 43

    6.4 Future Water Need Forecast Municipal and Individual Domestic Wells ........... 48

    6.5 Land Conversion ................................................................................................ 52

    6.6 Climate Change Effects ..................................................................................... 54

    7.0 Other Water Uses ............................................................................................. 54

    8.0 Use of Assessment i n Integrated Plan ........................................................... 55

    9.0 References ........................................................................................................ 56

    10.0 List of P reparers ............................................................................................... 58

    Yakima River Basin Study i Water Needs for Out-of-Stream Uses

  • List of Ta bles

    Table 1. Major Claimant Surface-water Entitlements above Parker Gage on Yakima, Tieton and Naches Rivers (in acre-feet) ...................................................................................... 9

    Table 2. Yakima Project Annual Surface-water Diversions Under Drought and Non-Drought Conditions (acre-feet) ...............................................................................................10

    Table 3. Comparison of Irrigated Acreage Data from WSDA and Irrigation Districts ..................12 Table 4. Yakima Project Crop Acreage by District WSDA Data .............................................13 Table 5. Yakima Project Crop Acreage District Survey Data ..................................................13 Table 6. Yakima Project Irrigation Techniques by District WSDA Data (in acres) ....................14 Table 7. Yakima Project Irrigation Techniques District Survey Data (in acres) .......................14 Table 8. Crop Irrigation Requirement Stations for Yakima Project .............................................15 Table 9. Average Crop Irrigation Requirements by District (acre-feet per acre) .........................15 Table 10. Efficiencies of Different Irrigation Techniques ............................................................16 Table 11. Estimated Average On-Farm I rrigation Efficiency ......................................................16 Table 12. Estimated On-Farm Water Needs (in acre-feet per acre) ...........................................17 Table 13. Estimated On-Farm Water Delivery Needs by District (in acre-feet) ..........................17 Table 14. Yakima Project Conveyance Loss Estimates by District ............................................18 Table 15. Yakima Project Estimated Conveyance Losses (in acre-feet) ....................................18 Table 16. Yakima Project Preliminary Water Balance KRD, WIP, SVID, KID (in acre-feet) ....19 Table 17. Yakima Project Preliminary Water Balance Roza, YTID (in acre-feet) ....................19 Table 18. Proratable Water Rights above Parker Gage .............................................................20 Table 19. Comparison of Drought Year Diversions to Average Non-Drought Diversions

    (in acre-feet) .............................................................................................................23 Table 20. Comparison of Drought Year Diversions to 70 Percent Reliability Target for KRD,

    Roza and WIP (in acre-feet) ......................................................................................26 Table 21. Water Shortfalls at Different Levels of Reliability (acre-feet) ......................................28 Table 22. Estimated Non-Federal Agricultural Irrigation ............................................................31 Table 23. Past Cropping Patterns for Yakima Project Districts ..................................................35 Table 24. Current Cropping Patterns for Yakima Project Districts .............................................35 Table 25. Estimated Past and Present Average Crop Irrigation Requirements by District

    (acre-feet per acre) ...................................................................................................35 Table 26. Estimated Past and Present Consumptive Use by District .........................................36 Table 27. Summary of Weighted Current and F

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