Keep Alaska Moving through service and infrastructure Water and - - PowerPoint PPT Presentation

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keep alaska moving through service and infrastructure
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Keep Alaska Moving through service and infrastructure Water and - - PowerPoint PPT Presentation

Dec 02, 2022 27 likes •358 views

Keep Alaska Moving through service and infrastructure Water and Roads Do not MIX!!!!!!! Design, Construction, and Maintenance Keep Alaska Moving through service and infrastructure Lets Start at the Very Beginning NEPA Purpose and need

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Keep Alaska Moving through service and infrastructure

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Keep Alaska Moving through service and infrastructure

  • Do not MIX!!!!!!!
  • Design, Construction, and Maintenance

Water and Roads

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Keep Alaska Moving through service and infrastructure

Lets Start at the Very Beginning

NEPA

  • Purpose and need
  • Alternatives
  • Avoidance, Minimize, and Mitigate impacts
  • Considerations
  • Coordination w/

Agencies

EFH MSFMCA CWA NHPA ESA MBTA CAA FWCA CZMA

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Keep Alaska Moving through service and infrastructure

Environmental Permits

  • Permits (pertaining to water)
  • ADF&G
  • COE
  • Flood Hazard
  • ADEC - APDES Construction General Permit &

401 Cert

  • Essential Fish Habitat Permit (part of NEPA, not

permit)

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Keep Alaska Moving through service and infrastructure

Other Criteria

  • DOT&PF Criteria
  • FHWA Criteria
  • Bioengineering cannot be sole means to

protect critical infrastructure

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Keep Alaska Moving through service and infrastructure

  • Different water challenges
  • Surface – Rain and Snow
  • Subsurface
  • Waterbody crossing/paralleling

Water and Roads

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Keep Alaska Moving through service and infrastructure

Surface Runoff on the Road

  • Road General Features
  • Road cross-slope
  • Foreslopes
  • Ditches
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Keep Alaska Moving through service and infrastructure

Surface Runoff on the Road

  • Special Considerations - Bridges
  • Scuppers
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Keep Alaska Moving through service and infrastructure

Surface Runoff on the Road

  • Special Considerations - Maintenance
  • Plowing
  • Sand
  • MS4
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Keep Alaska Moving through service and infrastructure

Subsurface

  • Groundwater
  • Storm Drain systems
  • Oil Grit Separators
  • LID
  • Sumps
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Waterbody Crossings

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Keep Alaska Moving through service and infrastructure

Tier 1 Fish Passage Design

Tier 1 (Stream Simulation)

  • Slope < 0.5%: culvert span > 0.75*OHW
  • 0.5% ≤ Slope < 6%: culvert span > 0.9*OHW
  • Round: invert burial ≥ 40% of diameter
  • Pipe arch: invert burial ≥ 20% of rise.
  • Culvert slope ± 1% of natural stream slope.
  • Add Substrate in culvert to simulate streambed

and be stable during larger discharges

  • Provide baffles to help retain sediment.
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Coal Creek at K Beach Road 18’ diameter buried 7.2’, After

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Keep Alaska Moving through service and infrastructure

Tier 2 Fish Passage Criteria

  • Requires FishXing software created by USFS
  • Fish sustained and burst swimming vs. water

velocity

  • Add resting areas as needed
  • Compares water depth to minimum depth for fish
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Tier 2 fish passage w ith baffles Alyeska Highw ay, Girdwood

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Tier 3 Fish Passage Criteria

  • Use hydraulic calculations to ensure

successful fish passage

  • Both ADF&G and DOT&PF agree
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Other information

  • Collaborate with ADF&G to provide the best

culvert designs that meet the criteria and constraints of both agencies

  • Erosion protection, as needed
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Wasilla Creek at Bogard, 17’-0” x 6’-9”

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Coal Creek at K Beach Road 2008, 10’ Diameter, Before, Outlet

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Coal Creek at K Beach Road 2008, Before, Outlet

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Coal Creek at K Beach Road, 2010, looking upstream

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Coal Creek at K Beach Road 2015, Tailw ater looking dow nstream

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Coal Creek at K Beach Road 2015 looking upstream

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Fish Creek at Knik Goose Bay Road Before, 2 – 12’ diameter

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Fish Creek at Knik Goose Bay Road After, 32’ x 12’

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Wasilla Creek at Palmer-Fishhook 17’-2”x11’-4”, buried 2.3’, 2016, Outlet

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Wasilla Creek at Palmer-Fishhook 2016 looking upstream

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Keep Alaska Moving through service and infrastructure

Fish Culverts in the design phase

  • North Fork Anchor River at Nikolaevsk Road
  • Crooked Creek at Sterling Highway
  • Two Moose Creek at Sterling Highway
  • Leader Creek near Naknek
  • Others on smaller streams
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Parallel Flow Embankment Saturation

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Keep Alaska Moving through service and infrastructure

Parallel Flow, Erosion

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Keep Alaska Moving through service and infrastructure

Parallel Flow, Road Overtopping

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Keep Alaska Moving through service and infrastructure

Parallel Flow, Embankment Stabilization

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Keep Alaska Moving through service and infrastructure

Parallel Flow, Embankment Stabilization