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Ramshorn pond dam rehabilitation Public information session

Ramshorn pond dam rehabilitation Public information session. May 14, 2014. PARE CORPORATION, FOXBORO, MA Allen R. Orsi, P.E., Managing Engineer. OUTLINE. Additional Evaluations Proposed Design Approach Additional Design Considerations. Additional evaluations.

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Ramshorn pond dam rehabilitation Public information session

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  1. Ramshorn pond damrehabilitationPublic information session May 14, 2014 PARE CORPORATION, FOXBORO, MA Allen R. Orsi, P.E., Managing Engineer

  2. OUTLINE • Additional Evaluations • Proposed Design Approach • Additional Design Considerations

  3. Additional evaluations • Upstream Membrane Option

  4. Additional evaluations • Upstream Membrane Option

  5. Additional evaluations • Toe Drain Impacts • Reviewed improvements provided by downstream toe drain • Existing Seepage Exit Gradient Factor of Safety = 1.2 • With Toe Drain Exit Gradient Factor of Safety = 2.0 • Dam safety practice designs for a Factor of Safety = 5.0

  6. Additional evaluations • Opinions of Cost • Significant cost impacts associated with contingencies and early stage of design

  7. Additional evaluations • Recommended Approach • Upstream Cutoff Wall • Durability • Permittability • Schedule • Drawdowns

  8. Design approach • Proposed Site Plan

  9. Design approach • Proposed Spillway

  10. Design approach • Proposed Low Level Outlet

  11. Design approach • Proposed Upstream Wall

  12. Design approach • Proposed Parking

  13. Design approach • Proposed Public Access

  14. Design approach • Proposed Drainage

  15. Additional design considerations • Control of Water • Drawdowns • Bypass / Flow Maintenance • Cofferdams • Construction Phasing • Detours / Road Closure • Public Access Information / Signage

  16. questions

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