Ida Lake Dam Existing Condition and Proposed Drawdown Plan - - PowerPoint PPT Presentation

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ida lake dam existing condition and proposed drawdown plan
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Ida Lake Dam Existing Condition and Proposed Drawdown Plan - - PowerPoint PPT Presentation

Mar 04, 2024 487 likes •684 views

Ida Lake Dam Existing Condition and Proposed Drawdown Plan Gregory Daviero, PhD, PE Michael Quinn, PE October 30, 2018 Tonights Agenda Existing conditions Previous failure of dam Proposed drawdown Long term solutions

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SLIDE 1

Ida Lake Dam – Existing Condition and Proposed Drawdown Plan

Gregory Daviero, PhD, PE Michael Quinn, PE October 30, 2018

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SLIDE 2

Tonight’s Agenda

  • Existing conditions
  • Previous failure of dam
  • Proposed drawdown
  • Long term solutions
  • Next steps
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SLIDE 3

Project Drivers

  • NYCRR Part 673 covers activities related to
  • wnership of dams
  • Promulgated August 19, 2009
  • Inspection and Maintenance Plan (I&M)
  • Engineering Assessment (EA)
  • FEMA funded project
  • Damaged during Hurricane Irene
  • Intended to repair left and right abutments
  • Inspection revealed an unsafe condition
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SLIDE 4

Site Location

Ida Lake Dam Ida Lake

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SLIDE 5

Existing Conditions

  • Timber dam – 135 ft long, 12 ft high
  • 28 crosswise supports spaced at 5 ft on center
  • Foundation is concrete slab on bedrock
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SLIDE 6

September 14, 2018 Inspection

  • Bents in good to fair condition
  • Spanning timbers in fair to very poor condition
  • Bents underneath dam
  • Failing spanning timbers

Area of significant cracking

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SLIDE 7

January 1998 Dam Failure (from NYS DEC Files)

  • Failure in

January 1998

  • Approximately

30 feet wide

  • Top: Dam

shortly after failure (February, 1998)

  • Right: Dam

Shortly before reconstruction (Summer, 1999)

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SLIDE 8

Existing Lake Elevation

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SLIDE 9

Proposed Lake Lowering Plan (Looking Downstream)

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SLIDE 10

Proposed Lake Lowering Plan (Looking Upstream)

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SLIDE 11

Existing Lake Elevation

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SLIDE 12

Anticipated Lake Elevation

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SLIDE 13

Site after 1997 Drawdown

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SLIDE 14

Permitting

  • NYS DEC Dam Safety
  • US Army Corps of Engineers
  • NYS DEC Region 4
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SLIDE 15

Long Term Solutions

  • Decommissioning (Removal)
  • Replace with a more resilient structure (not wood)
  • Replace with a more resilient structure at a lower

crest elevation

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SLIDE 16

Next Steps

  • Lower Pool
  • Collection of site topography
  • Deliberations on the future of the structure
  • Community meeting for presentation on options
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SLIDE 17

Questions?

Gregory Daviero, PhD, PE Michael Quinn, PE October 30, 2018

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SLIDE 18

Regulated Waters and Wetlands

  • NYSDEC
  • Poesten Kill regulated as a Class C waterway
  • Supporting fisheries and non-contact recreation
  • No mapped wetlands
  • Federal Wetlands
  • Forested
  • Open Water
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SLIDE 19

Federally Regulated Waters and Wetlands

  • NYSDEC
  • Poestenkill regulated as a Class C waterway
  • Supporting fisheries and non-contact recreation
  • No mapped wetlands
  • Federal Wetlands
  • Forested
  • Open Water

Ida Lake Dam