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Hydrologic Indices

Yuba River Development Project FERC Project 2246 Relicensing. Hydrologic Indices. Thursday, April 11, 2013. Hydrologic Indices. Introduction Hydrologic index usage Existing indices in the Yuba River watershed Unimpaired Yuba River flow at Smartsville Comparison of indices

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Hydrologic Indices

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  1. Yuba River Development Project FERC Project 2246 Relicensing Hydrologic Indices Thursday, April 11, 2013

  2. Hydrologic Indices • Introduction • Hydrologic index usage • Existing indices in the Yuba River watershed • Unimpaired Yuba River flow at Smartsville • Comparison of indices • Comparison of indices and Middle Yuba River flow • Comparison of year-type classifications

  3. Yuba River Watershed

  4. Hydrologic Index Usage • Hydrologic Indices have two purposes: • Characterize hydrology • Define year-type classifications • Characterizing hydrology is critical to ensure accurate representation of a natural process • Year-type classifications are a statistical exercise to make sure “bins” capture correct flow ranges

  5. Existing Indices in Yuba River Watershed • Existing YCWA FERC License (4 WY) • Based on annual unimpaired flow at Smartsville • Year-types defined by percentage of 50-year average unimpaired flow • Yuba River Index (5 WY) • Part of RD-1644, no current application for determining flows • Based on weighted unimpaired flow at Smartsville • 0.2*(prev index) + 0.3*(Oct-Mar) + 0.5*(Apr-Jul) • North Yuba Index (6 WY) • Part of Yuba River Accord • Based on end-of-Sept. New Bullards Bar storage + annual inflow • YB/DS Index (6 WY) • Part of proposed license conditions • Based on annual unimpaired flow at Smartsville

  6. Annual Unimpaired Yuba River Flow at Smartsville

  7. Annual Unimpaired Yuba River Flow at Smartsville

  8. Selected Comparisons of Existing Indices

  9. Selected Comparisons of Existing Indices

  10. Comparisons of Existing Indices • Three primary indices generally characterize hydrology similarly. • Slight differences due to variations in approach • YRI emphasizes April-July runoff, so years like WY 2013 are represented as drier than in YB/DS • NYI includes storage, so transitions from dry to wet are represented as drier than in YB/DS (and inverse)

  11. Existing Indices vs. Middle Yuba River Flow

  12. Existing Indices vs. Middle Yuba River Flow

  13. Existing Indices vs. Middle Yuba River Flow

  14. Existing Indices vs. Middle Yuba River Flow

  15. Existing Indices vs Middle Yuba River Flow • Existing indices do a good job of representing annual hydrology of the Middle Yuba River • Monthly variability in Middle Yuba River flow is not well represented

  16. Comparison of Year-Type Classifications

  17. Comparison of Year-Type Classifications

  18. Comparison of Year-Type Classifications

  19. Comparison of Year-Type Classifications

  20. Year-Type Distribution

  21. Year-Type Distribution

  22. Year-Type Distribution

  23. Where do we go from here?

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