Willamette Sustainable Rivers Project - Taylor, Bach, & Budai


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Presented by Greg Taylor, US Army Corps of Engineers, at Within Our Reach 2012.

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Willamette Sustainable Rivers Project - Taylor, Bach, & Budai

  1. 1. Willamette Within Our Reach December 11-12, 2012 Developing, Implementing andEvaluating Environmental Flows in the Willamette River BasinLeslie Bach, The Nature ConservancyChris Budai, Corps of Engineers
  2. 2. Environmental Flows Quantity, timing and quality of water flows required to sustain freshwater and estuarine ecosystems and the human livelihood and well-being that depend on these ecosystems Brisbane Declaration© Leslie Bach/TNC © Michael Durham © Leslie Bach/TNC © Emilie Blevins/TNC
  3. 3. Willamette Basin Project,USACE:13 Multi-Purpose Dams and Reservoirs,132 miles of navigation channel,100 miles of revetments© USACE from USACE Photo © USACE © Leslie Bach/TNC© Leslie Bach/TNC Photo from USACE Photo from USACE
  4. 4. Process for Developing and Implementing Environmental Flow Recommendations Hydrologic Analysis: Pre- and Post- dam flow data Flow-Ecology Relationship: •Salmon and other native fish •Native riparian vegetation •Amphibians, mussels, invertebrates, birds •Floodplain wetlands •Geomorphic and hydrologic processes Hydrologic and Hydraulic Analysis Environmental Flow Recommendations
  5. 5. Initial Environmental Flow Recommendations Middle Fork Willamette River
  6. 6. Ecosystem Flow Requirements South Santiam River at WaterlooSeason Fall Winter Spring Summer Winter Events Above Bankfull 15,000 up to 60,000 cfs Various events not occurring each year Create lateral and floodplain habitat Key High High Winter Events Up to Bankfull Low 7,000 to 15,000 cfsFlows Transition 5-6 events Linked to storms Spring Flows Create lateral and floodplain habitat 4,000 gradually declining to 1,500 cfs Maintain flows for lateral and downstream species movement, promote riparian vegetation establishment Spring Events Low 1,000 to 4,000 cfs 3-8 eventsFlows Linked to storms Create lateral and floodplain Winter Flows habitat Fall Flows 1,500 to 3,000 cfs 3,000 cfs Consistent to prevent For fish dewatering of habitat Summer Flows passage 800 to 1,200 cfs and Consistent to prevent habitat dewatering of habitat SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG
  7. 7. Middle ForkWillamette
  8. 8. Winter High Flows Spring High Flows Fall Fall Pulses and drawdown Transition Flows © Leslie Bach/TNC© Mary Karen Scullion © Leslie Bach/TNC
  9. 9. Ecological Benefits of Flow Restoration• Germination and survival of native riparian vegetation• Upstream and © Leslie Bach/TNC Photo from USACE downstream fish migration• Floodplain connectivity and wetland habitat Photo from USACE• Survival of native floodplain species Photo from USACE © Emilie Blevins/TNC
  10. 10. Policy/Management Implications• Integrating with other project purposes• Population distribution (within floodplain and cities)• Existing environmental © Leslie Bach/TNC requirements – Biological Opinion – Water quality• Basin-wide implementation – Modeling scenarios – Real time monitoring – Uncertainty (forecasting; climate © Leslie Bach/TNC change)
  11. 11. TNC/Corps of Engineers Sustainable Rivers ProjectE-flows training, Mexico Yangtze River Forum, China E-flows training, Columbia © Leslie Bach/TNC © Lisa Morales/USACE © Leslie Bach/TNC
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