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Factors for Decline NOAA (1998)

Factors for Decline NOAA (1998). Insufficient Streamflows. “migration delay resulting from insufficient streamflows or habitat blockage…. loss of usable habitat due to dewatering and blockage…. increased juvenile mortality from increased water temperatures.”. 1997 NMFS Federal Register.

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Factors for Decline NOAA (1998)

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  1. Factors for DeclineNOAA (1998)

  2. Insufficient Streamflows “migration delay resulting from insufficient streamflows or habitat blockage…. loss of usable habitat due to dewatering and blockage…. increased juvenile mortality from increased water temperatures.” 1997 NMFS Federal Register

  3. Insufficient Streamflows Current impact of water withdrawals on natural streamflows (August); Restoration efforts under Oregon Plan; Change in water withdrawals since onset of Oregon Plan (~1999); Impact anticipated from future water withdrawals.

  4. Water Availability Databases

  5. Natural Streamflow Flow in stream with no consumptive uses - e.g. 80% exceedance flow Estimated in one of three ways: • miscellaneous measurements • prediction equations based on measured streamflows • continuous measurements All exceedance flows represent same period (1958 to 1987)

  6. Consumptive Use Causes a net reduction in streamflow. Usually associated with loss via evaporation or transpiration. Three major categories of consumptive use: 1. Irrigation 2. Municipal 3. All others (e.g., domestic, livestock) - Usually small in comparison with stream flow.

  7. “Water Availability Basins” Natural Streamflow

  8. Consumptive Use (CU) Natural Streamflow 10 - 3 - 2 = 5 cfs

  9. “WABs” in Coastal Coho ESU Water Availability Basins North Coast: 164 Mid Coast: 156 Mid-South Coast: 210 Umpqua: 103

  10. ~17 cfs leased instream

  11. ~16 cfs leased instream

  12. Linking Coho Stream Miles to Water Availability Basins

  13. Water Availability Datasets

  14. Preliminary Conclusions • Consumptive use of water not widespread issue • Consumptive use generally increases from north to south within the ESU • Since 1997, streamflow restoration activities coincide with areas of highest consumptive use impacts on streamflow • Consumptive use not substantially increased since 1999 or likely to increase in future

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