Cedar River Instream Flow Management by 7BJSf68

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									Cedar River Instream Flow
      Management

   Balancing Certainty and
          Flexibility
Setting the Context:
5 LINKS--Headwaters to Sea
Cedar River Watershed HCP
• Preserves and protects the upper 2/3 of the
    Cedar River basin
•   Fish passage facilities to restore access for
    chinook, coho and steelhead into over 17 miles
    of habitat
•   Innovative sockeye hatchery supplementation
    program
•   Capital improvements throughout the Lake
    Washington Basin
•   Improved instream flow management program
•   Broad-based monitoring and research program
Stream Flow Management:
Protecting Instream Resources
• Seattle’s water storage and diversion activities
    have a substantial effect on stream flows in the
    lower Cedar River
•   Stream flow is a key component of the
    aquatic/riparian ecosystem that supports salmon
    and many other species
•   Social values and species protection priorities
    change over time
•   The applied science of stream flow management
    is complex, relatively new, and continues to
    evolve
    Geographic
    Overview
                 • Storage
                   reservoir
                   receives run-off
                   from the upper
                   43% of the
                   basin
                 • Approx. 20% of
                   average
                   annual flow
                   diverted at the
                   Landsburg
                   Diversion Dam


5
Complex Array of Objectives

• Protect all life stages of salmon
• Provide sufficient flows to Lake Washington
  and the Ballard Locks
• Minimize impacts to lake dependent species
  in Chester Morse Reservoir
• Promote natural biophysical processes that
  shape and maintain the aquatic/riparian
  ecosystem
Cedar River Salmon Life Stages
                       Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul   Aug
CHINOOK   SP
          IN
          FE
          RE
          MO                                                    ?
COHO      SP
          IN
          FE
          RE
SOCKEYE   SP
          IN
          FE
          MO
STEELHEAD SP
          IN
          FE
          RE

   SP: spawning         RE: juvenile rearing
   IN: incubation       MO: migration out of river
   FE: fry emergence
Complex Array of Objectives

• Protect all life stages of salmon
• Provide sufficient flows to Lake Washington
  and the Ballard Locks
• Minimize impacts to lake dependent species
  in Chester Morse Reservoir
• Promote natural biophysical processes that
  shape and maintain the aquatic/riparian
  ecosystem
The HCP Flow Tool Box
• Capital improvements to help protect fish
• Detailed mngmt. prescriptions that protect the
  river and maintain municipal water supply
  capacity
• Limitations on diversions to ensure flexibility to
  adapt and improve flow management
• Continued monitoring and research
• Commitment to apply research results
• Collaborative oversight
Capital
Improvements

 SCL’s Cedar Falls hydropower facilities
   improved to protect fish and flows
 Fish passage and water efficiency
   improvements at the Ballard Locks
 Habitat protection/restoration in the lower river
   downstream of Seattle’s ownership boundary
Prescriptions for real-time
management
• Guaranteed flows
   Minimums below which flows are not allowed
    to drop
   Supplemental flows provided according to
    hydrologic conditions and biological need
• Downramping requirements to moderate
 rates of stream flow reduction
  Reduce the risk of fish stranding and,
  More closely emulate patterns of natural flow
    recession
Guaranteed Flow Regime
                                                                                   CEDAR RIVER HCP
                                                        Guaranteed Stream Flows Adjusted to Renton

                               600
Flow at Renton (cfs)




                               500


                               400


                               300


                               200


                               100

                                               chinook spawning            sockeye spawning                 coho spawning              steelhead spawning            steelhead rearing
                                    0
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                                                                                                                                 M
                                                                                                               Week
                               Flow Providing Maximum WUA                                                                  IRPP Flow
                               HCP Low Normal w/No Supplements and Median Inflows                                          HCP High Normal w/Supplements and Median Inflows
2000 Compliance Graph
                                                                                      Calendar Year 2000
                                                            Cedar River Instream Flows Measured at USGS Stream Gage No. 12117600
                          1200                                                                  Firm Block - 2500 Ac-Ft Allocation for Steelhead Incubation.                                                  High Normal Minimum Flows for
                                                                                                 Schedule Set by Agencies on June 14. Revised on July 6.                                                    Sockeye and Chinook Spawning This
                                                                                                                                                                                                            Year. Decision Made on October 4.

                          1000                                                                                                                            City Offers Non-Firm Block - 3500 Ac-Ft
                                                                                                                                                     Allocation. Decision Deferred by Agencies to July
                                                                                                                                                      6. Agencies Decline Non-Firm Block on July 6.
Average Daily Flow, cfs




                           800
                                                                                                                                                              Higher Normal Flows for Sockeye and
                                                                                                                                                              Chinook Spawning This Year Because
                                                                                                                                                              Temporary Flashboards Are In Place.
                           600



                           400



                           200                 Non-Firm Flow Supplement
                                                for Sockeye Outmigration

                                         HCP/IFA Signed on April 21, 2000
                             0




                                                                                                                                                                                                                                      4-Nov

                                                                                                                                                                                                                                              18-Nov
                                                                              11-Mar

                                                                                       25-Mar

                                                                                                  8-Apr

                                                                                                          22-Apr
                                 1-Jan

                                          15-Jan

                                                   29-Jan

                                                            12-Feb

                                                                     26-Feb




                                                                                                                                    3-Jun

                                                                                                                                            17-Jun




                                                                                                                                                                                 12-Aug

                                                                                                                                                                                          26-Aug

                                                                                                                                                                                                    9-Sep

                                                                                                                                                                                                            23-Sep
                                                                                                                                                      1-Jul

                                                                                                                                                               15-Jul

                                                                                                                                                                        29-Jul




                                                                                                                                                                                                                     7-Oct

                                                                                                                                                                                                                             21-Oct




                                                                                                                                                                                                                                                               16-Dec

                                                                                                                                                                                                                                                                        30-Dec
                                                                                                                   6-May




                                                                                                                                                                                                                                                       2-Dec
                                                                                                                           20-May




                                                                                                                           Days of the Calendar Year
                             Normal Minimum Flows                                       Normal Minimum Flows Plus Supplemental Flows                                                               Actual Flows                          Critical Minimum Flows
                                        Distribution and Hierarchy of Cedar River Flows
                                                 (Average Annual Flows in MGD)


Preserving          549 MGD




Flexibility:




                                           100
                                                           Reserved for Fish                   Unperfected Portion of
                                                                                               Seattle's Claim
                    449 MGD                                                                    (150 MGD)


Cedar River
                                                       Flexibility: Fish (Primary)




                                           50
                                                       Water Supply (Secondary)
                    399 MGD
                                                   Flexibility: Water Supply (Primary)




                                           45
                                                             Fish (Secondary)
                    354 MGD


Hierarchy of
                                                                                               Perfected Portion of
                                                                                               Seattle's Claim




                                           105
                                                      Reserved for Water Supply                (150 MGD)




River Flows
                    249 MGD




                                                                                               HCP Guaranteed




                                           249
                                                           Reserved for Fish
                                                                                               Instream Flows
                                                                                               (249 MGD)



                       0 MGD


                                                 Summary:

                                                 Reserved for Fish                       64%

                                                 Reserved for Water Supply               19%

                                                 Flexibility: Fish Primary               9%

                                                 Flexibility: Water Supply Primary       8%


               blocks.vsd 5/14/99 jmk
 Monitoring and Research--
 Supplemental Biological Studies
Dedicated funding to investigate up to 19
prioritized study questions addressing the effects
of stream flow on:


• Chinook and sockeye spawning and incubation
• Steelhead spawning and incubation
• Chinook early life history
• Water temperature
• Natural ecological processes that shape and
  maintain riparian and in-channel habitat
                                      Distribution and Hierarchy of Cedar River Flows
                                               (Average Annual Flows in MGD)


                  549 MGD




Commitment




                                         100
                                                         Reserved for Fish                   Unperfected Portion of
                                                                                             Seattle's Claim
                  449 MGD                                                                    (150 MGD)
                                                     Flexibility: Fish (Primary)


to Apply



                                         50
                                                     Water Supply (Secondary)
                  399 MGD
                                                 Flexibility: Water Supply (Primary)




                                         45
                                                           Fish (Secondary)
                  354 MGD
                                                                                             Perfected Portion of


Results
                                                                                             Seattle's Claim




                                         105
                                                    Reserved for Water Supply                (150 MGD)

                  249 MGD




                                                                                             HCP Guaranteed




                                         249
                                                         Reserved for Fish
                                                                                             Instream Flows
                                                                                             (249 MGD)



                     0 MGD


                                               Summary:

                                               Reserved for Fish                       64%

                                               Reserved for Water Supply               19%

                                               Flexibility: Fish Primary               9%

                                               Flexibility: Water Supply Primary       8%


             blocks.vsd 5/14/99 jmk
Oversight
Cedar River Instream Flow Commission
Representatives from:
  • National Marine Fisheries Service
  • U.S. Fish and Wildlife Service
  • Muckleshoot Indian Tribe
  • Washington Department of Fish & Wildlife
  • Washington Department of Ecology
  • King County
  • U.S. Army Corps of Engineers
  • Seattle City Light
  • Seattle Public Utilities
 Does the Tool Box promote the
 right mix of certainty and
 flexibility?
• Capital improvements to help protect fish
• Detailed mngmt. prescriptions that protect the
  river and maintain municipal water supply capacity
• Limitations on diversions to ensure flexibility to
  adapt and improve flow management
• Continued monitoring and research
• Commitment to apply research results
• Collaborative oversight

								
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