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UPDATES

Q&A: Auxiliary SPillway and Trencher

8/28/2023

 
Learn more about Auxiliary Spillways and why they are being included in the dam projects. Find out how a trencher works and how the contractors are using it. 
Picture
Q: What is an Auxiliary Spillway? 
A: Pictured below is the Secord Dam auxiliary spillway. The auxiliary spillway is a secondary spillway that will pass water from an extremely large storm event if the primary spillway exceeds its capacity. This provides a controlled way to manage high water flows. The water would get diverted into this large concrete basin then passed through a chute and returned to the river further downstream of the dam. None of the dams previously had auxiliary spillways – this is a new and very important safety feature.

Picture
Q: What is the Trencher at Edenville Dam and what does it do? 
A: To better control seepage through the embankments, a seepage cutoff wall is being constructed along the upstream edge of the crest of the embankments down to the glacial till. To build the wall, a trencher excavates the soil to depth and continually mixes it with bentonite (an absorbent swelling clay) and cement. This creates a strong and impermeable wall. There will be short sections of steel sheet piling to connect the wall to the existing spillways.


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Four Lakes Task Force
  • About
    • History
    • Who We Are >
      • Team Bios
    • Operations
    • Secord Dam
    • Smallwood Dam
    • Edenville Dam
    • Sanford Dam
  • Restoration Plan
  • Donate
    • Why Donate?
    • Our Donors >
      • Corporate Sponsors
      • Individual Donors
    • Four Lakes Legacy Society
  • Events
  • Documents
    • Annual Reports
    • Audited Financials
    • County Documents
    • Dam Construction Updates
    • Edenville/Wixom
    • Engineering Reports & Studies
    • Flyers & Brochures
    • Meeting Presentations
    • News Flashes
    • Newsletters
    • Publications & Partner Presentations
    • Published Statements
    • Regulatory Correspondence
    • Restoration Plan
    • Sanford
    • Secord
    • Smallwood
    • Tax Filings & Governance
  • Resources
    • Erosion Control >
      • Project Map
      • Project Permitting
      • What You Can Do
    • FOIA Request
    • Frequently Asked Questions
    • Lakebottom Information
    • Subscribe
    • Updates
    • Volunteer Portal
  • Special Assessment District
    • Assessment Map
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