Science on the Elwha

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Science on the Elwha

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  1. Science on the Elwha

    Slide 1 - Science on the Elwha

  2. Overview

    Slide 2 - Overview

    • What is special about the Elwha dam removal?
    • What questions did people have?
    • Who was involved and why were they involved?
  3. What is so special about this situation?

    Slide 3 - What is so special about this situation?

    • Largest dam removal project in the US
    • Coastal watershed
    • In a protected, largely undeveloped national park
  4. Overview of the Elwha Dams

    Slide 4 - Overview of the Elwha Dams

    • Two dams built starting in 1910 to generate power for a paper mill
    • No fish ladders were built into these dams so fish stopped spawning upriver
    • Two lakes (“reservoirs”) developed behind the dams
    • Sediment built up in these lakes over the years
  5. What questions did people have?

    Slide 5 - What questions did people have?

    • Coastline Questions
    • Lake Questions
    • River Questions
  6. River Questions

    Slide 6 - River Questions

    • Where will the sediment go when the dams are removed?
    • What impact will the sediment have on the river? Salmon? Animals who eat salmon?
    • How fast should the dams be removed?
  7. Lake Questions

    Slide 7 - Lake Questions

    • What will happen to the lake bed after it is drained?
    • What animals will visit the lake bed after new plants start to grow?
  8. Coastline Questions

    Slide 8 - Coastline Questions

    • How will the changing shoreline impact marine plants and animals?
    • How will the sediment flowing downriver effect the water supply in Port Angeles?
  9. Who and Why?

    Slide 9 - Who and Why?

    • Motivations
    • Learning about river recovery so that we can apply the knowledge to future river restoration projects
    • Salmon are a culturally and economically valuable resource
    • Mitigating hardship to Port Angeles residents
    • Being legally responsible to Elwha tribe agreements
    • People
    • Department of natural resources (DNR)
    • Olympic National Park rangers
    • Regional university scientists
    • US Geological Society (USGS)
    • Environmental NGOs
  10. Your task

    Slide 10 - Your task

    • Pick one question from the list to investigate. Research it online and answer the questions below:
    • What is the question?
    • Who asked this question and what were their motivations?
    • What research was done or is being done?
    • What are the results of the research?
  11. Resources

    Slide 11 - Resources

    • Question
    • Links
    • Where will the sediment go when the dams are removed?
    • Sediment Experiments
    • Webcams & Project Overview
    • Coastline Sediment
    • How will the sediment flowing downriver effect the water supply in Port Angeles?
    • Water Health
    • PA Water Treatment
    • Treatment Facility Problems Overview
    • What impact will the sediment have on the river? Salmon? Animals who eat salmon?
    • Elwha Salmon Overview
    • Salmon Return Overview
    • What will happen to the lake bed after it is drained?
    • Floodplain Vegetation
    • How fast should the dams be removed?
    • Removal Overview
    • Removal Explained
    • How will the changing shoreline impact marine plants and animals?
    • Coastline Overview
    • Research Overview (complex) Web Videos Elwha Blog