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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 damrehabilitationPublic 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 • Upstream Membrane Option
Additional evaluations • Upstream Membrane Option
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
Additional evaluations • Opinions of Cost • Significant cost impacts associated with contingencies and early stage of design
Additional evaluations • Recommended Approach • Upstream Cutoff Wall • Durability • Permittability • Schedule • Drawdowns
Design approach • Proposed Site Plan
Design approach • Proposed Spillway
Design approach • Proposed Low Level Outlet
Design approach • Proposed Upstream Wall
Design approach • Proposed Parking
Design approach • Proposed Public Access
Design approach • Proposed Drainage
Additional design considerations • Control of Water • Drawdowns • Bypass / Flow Maintenance • Cofferdams • Construction Phasing • Detours / Road Closure • Public Access Information / Signage
