Alternative Stabilization Techniques September 10, 2018 Paul Meyer - - PowerPoint PPT Presentation

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Alternative Stabilization Techniques September 10, 2018 Paul Meyer - - PowerPoint PPT Presentation

Apr 08, 2023 582 likes •811 views

Protecting Shorelines: Alternative Stabilization Techniques September 10, 2018 Paul Meyer Manager, Environmental Permitting & Compliance Maritime Environment & Sustainability Nineteen sites Over 100 acres One-third already

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Protecting Shorelines: Alternative Stabilization Techniques

Paul Meyer Manager, Environmental Permitting & Compliance Maritime Environment & Sustainability September 10, 2018

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  • Nineteen sites
  • Over 100 acres
  • One-third already restored
  • Many w/ public shoreline access
  • Mostly estuarine and marine habitat
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Developed sites

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T117 Habitat Types

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Terminal 117

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2068 High Water Line (+15’ MLLW)

Sea Level Rise

2018 High Water Line (+12’ MLLW)

Terminal 117

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Smith Cove

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On-Slope Riparian (> +12’ MLLW) Shellfish & Mudflat (+8’ to -2’ MLLW) Eelgrass (-2’ to -12’ MLLW) Kelp (-12’ to -24’ MLLW) Marsh plants (+12’ to +8’ MLLW)

Smith Cove Park Elliott Bay Marina Cruise Terminal

Smith Cove Blue Carbon

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Port Shorelines

  • Port of Seattle owns 16

miles of shoreline

  • Over 90% armored (rip-rap,

bulkhead, etc)

  • Habitat for listed species
  • Increasing pressure due to

sea-level rise and climate change

  • Maintenance and repair

actions subject to challenging regulations

Port-Owned Parcel Boundary Bank-line

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Bankline Stabilization Programmatic Permit

  • Framework of pre-approved solutions
  • Solutions ladder from a fully restored bankline

solution through maintenance of existing infrastructure

  • Characterize existing bankline conditions
  • Evaluate feasibility of enhancement
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Decision Tree

  • Environmental enhancement through alternative

and/or in-kind repairs where feasible

  • Allow in-kind repair/replacement where

enhancement infeasible

  • No expansion of hard structural stabilization

allowed through programmatic permits

  • Align with regulatory framework
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Alternative Stabilization w/ Natural Elements

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Alternative Stabilization w/ Natural Elements

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Alternative Stabilization w/ Natural Elements

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Alternative Stabilization w/ Natural Elements

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Programmatic Governance

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Results

  • Continue to protect Port assets from bankline

failure and vessel wake, wind and current erosion

  • Employ best management techniques from

agency perspective,

  • Self mitigate for construction by improvement or

at least not increasing size or making worse .

  • Track improvements over time
  • Work permitted for 10 years

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T108 Before

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Transition Anchor System

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West Yard Top of Slope Riparian System

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South Riverside Before

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Transition Anchor System

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questions