Cheakamus River Km 6.5 side channel rewatering project

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Cheakamus River Km 6.5 side channel re-watering
project

• River Restoration Northwest Symposium 2008
• Skamania, Washington
• Prepared by
• Peter Frederiksen, CPESC, Triton Environmental
  Consultants Ltd.
• Carl Halvorson, Property Manager, North Vancouver
  Outdoor School
• Luanne Patterson, Environmental Protection
  Officer, Canadian National Railway
• Jeff Thorlacius, Triton Environmental Consultants
  Ltd.
• Presented by
• Peter Frederiksen, CPESC
• Triton Environmental Consultants, Ltd.

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Presentation outline
Cheakamus River Km 6.5 side channel re-watering
project

• Background
• Planning and design
• Construction activities
• Channel excavation
• Bank protection
• Habitat structures
• Channel re-watering
• Monitoring
• Review

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 2
3
Background
Cheakamus River Km 6.5 side channel re-watering
project

• Project location
• 30 miles north of Vancouver
• Cheakamus River
• Watershed 400 mi2
• Barrier _at_ mile 10.5
• Dam _at_ mile 15

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 3
4
Background
Cheakamus River Km 6.5 side channel re-watering
project

• Coastal watershed
• High flows - fall/winter
• Regulated flow regime
• 500-700 cfs Sept - June
• 1,400 cfs July - August
• 5-10,000 cfs common
• Max recorded 50,000 cfs (October 2003)

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 4
5
Background
Cheakamus River Km 6.5 side channel re-watering
project

• August 2005 derailment
• Canadian National Railway
• 12,000 gallons of 73 NaOH
• Impact assessment
• Pulse disturbance
• Habitat unaffected
• Estimated 90 mortality

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 5
6
Background
Cheakamus River Km 6.5 side channel re-watering
project

• Cheakamus Ecosystem Recovery
• Steering Committee (CERSC)
• Technical Committee (CERTC)
• Canadian National Railway
• District of Squamish
• Fisheries and Oceans Canada
• Ministry of Environment
• Squamish Nation
• Stakeholder Team public input
• Canadian National Railway
• Voluntary involvement
• Program funding

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 6
7
Background
Cheakamus River Km 6.5 side channel re-watering
project

• Recovery Plan (CERP)
• Species prioritization
• Strategies
• Natural recovery monitoring
• Fish culture
• Habitat enhancement
• Mainstem woody debris
• Side channel re-watering

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 7
8
Planning and design
Cheakamus River Km 6.5 side channel re-watering
project

• Project selection criteria
• High priority species
• Feasibility
• Accessibility
• Monitoring
• Other species

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 8
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Planning and design
Cheakamus River Km 6.5 side channel re-watering
project

• Targets
• Juvenile rearing
• rainbow trout
• chinook salmon
• (high priority species)
• Dimensions
• 12 - 20 ft wide
• 20 - 40 cfs (low water)
• 30 LWD structures

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 9
10
Planning and design
Cheakamus River Km 6.5 side channel re-watering
project
Flow

• Feasibility survey
• Channel routing
• Gradient
• Access
• Partnerships

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 10
11
Conceptual project
Cheakamus River Km 6.5 side channel re-watering
project
Flow

• Access
• Spoil areas
• Channel stability
• Structure designs and concepts
• Partnerships

Access ramps
Spoil area
Clean material (gravel) stockpile area
Educational viewing platforms for NVOS
Inlet protection modified log jam
Access Wountie east dyke
Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 11
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Construction activities
Cheakamus River Km 6.5 side channel re-watering
project

• Channel excavation
• Bank protection
• Habitat structures and pools
• Inlet protection
• Channel re-watering
• Monitor and adjust

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 12
13
Construction activities
Cheakamus River Km 6.5 side channel re-watering
project

• Construction completed in isolation
• 2/3 of channel dry after excavation
• Groundwater encountered d/s 1/3 of channel and
  deeper pools

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 13
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Channel excavation
Cheakamus River Km 6.5 side channel re-watering
project

• Two stage excavation
• Spoil removal
• Design elevation
• Length 1,000 ft
• Width 15 - 30 ft
• Depth 3 - 6 ft
• Volume and time
• 2,500 yd3
• 9 days

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 14
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Channel excavation
Cheakamus River Km 6.5 side channel re-watering
project
Existing channel
Spoil removal
Preliminary elevation
Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 15
16
Bank and channel protection
Cheakamus River Km 6.5 side channel re-watering
project

• Embedded boulders 2 - 3 ft diameter
• 2 - 4 rows high
• Cobble to fill interstitial spaces
• Concurrent with habitat structures
• Channel bottom covered with cobble

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 16
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Bank protection
Cheakamus River Km 6.5 side channel re-watering
project
0130 u/s view
0130 u/s view
Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 17
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Habitat structures
Cheakamus River Km 6.5 side channel re-watering
project

• Boulder clusters
• Excavated pools
• Ballasted LWD
• Triangular LWD
• Multiple LWD
• Individual rootwads

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 18
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Boulder clusters and pools
Cheakamus River Km 6.5 side channel re-watering
project

• Boulder riffle (multiple 1.5 - 2 ft individual
  boulders)
• Boulder clusters
• 6-10 boulders (1 - 1.5 ft) per cluster
• Excavated pools
• Large - 3 ft deep x 150-300 ft2
• Small - 2 ft deep x 30 ft2

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 19
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Structure anchoring
Cheakamus River Km 6.5 side channel re-watering
project

• GOALS
• Stabilize position
• Minimize movement
• Reduce profile
• (DAoust and Millar 2000)

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 20
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Structure anchoring
Cheakamus River Km 6.5 side channel re-watering
project

• LWD ballasted w/boulders
• Mechanical anchoring
• steel fastener chain
• Chemical anchoring
• epoxy steel cable
• Buried components

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 21
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Mechanical fastening
Cheakamus River Km 6.5 side channel re-watering
project

• Rock climbing anchors (7,500 lbs)
• 3/16 inch galvanized chain 400 lb lift rating
• 3/16 inch shackles
• Multiple anchors per structure
• Smaller structures (buoyancy lt2,200 lbs)

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 22
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Mechanical fastening
Cheakamus River Km 6.5 side channel re-watering
project
Drill to depth (2 in)
Clean hole
Hammer to set
Tighten
1400 lb boulder
Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 23
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Chemical fastening
Cheakamus River Km 6.5 side channel re-watering
project

• Hilti RE 500 Epoxy
• 3/8 inch galvanized cable (5,000 lb)
• Hole depth 10 - 12 inches
• Multiple anchors per structure
• Larger structures (buoyancy gt2,200 lbs)

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 24
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Chemical fastening
Cheakamus River Km 6.5 side channel re-watering
project
Drill to depth (10-12 in)
Clean hole
Fill with epoxy
Insert cable
Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 25
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Cheakamus River Km 6.5 side channel re-watering
project
Construction review
Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 26
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Inlet protection
Cheakamus River Km 6.5 side channel re-watering
project

• Existing LWD jam
• Modified to
• Limit high flow events
• Limit debris entry
• Allow natural stage fluctuations
• Be accessible for maintenance

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 27
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Channel re-watering
Cheakamus River Km 6.5 side channel re-watering
project

• Connected first at downstream end
• Flows re-introduced in stages

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 28
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Monitoring
Cheakamus River Km 6.5 side channel re-watering
project

• Photo documentation
• As-built drawings
• Ballasting Engineer review
• Fish utilization
• Periodic inspections
• Flow and structure adjustments

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 29
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As built drawings
Cheakamus River Km 6.5 side channel re-watering
project
Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 30
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As built drawings
Cheakamus River Km 6.5 side channel re-watering
project
Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 31
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Effort
Cheakamus River Km 6.5 side channel re-watering
project

• Feasibility and permitting
• 20 person days
• Construction (35 days)
• 80 person days
• 70 equipment days
• Monitoring and reporting
• 20 person days

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 32
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Project review
Cheakamus River Km 6.5 side channel re-watering
project

• 2005 NaOH spill
• CN funded programs
• Cooperation w/agencies
• CERP - strategies
• Km6.5 - assessment
• Feasible
• Accessible
• Monitoring advantages
• Partnerships (NVOS)
• Conceptual project

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 33
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Project review
Cheakamus River Km 6.5 side channel re-watering
project

• Construction
• Preliminary excavation
• Groundwater d/s end
• Final excavation
• Groundwater in pools
• Bank protection
• LWD and boulder structures
• Ballasting
• Inlet protection

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 34
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Project review
Cheakamus River Km 6.5 side channel re-watering
project

• Monitoring
• Photo documentation
• As built drawings
• Ballast review
• (engineer assessment)
• Adjust from observations
• Fish utilization

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 35
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Project review
Cheakamus River Km 6.5 side channel re-watering
project

• NEW HABITAT AREA
• 1000 linear ft of channel (13,000ft2)
• 15 Pools
• 30 LWD Structures
• 50 Boulder features
• 1 structure per 12 linear ft

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 36
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Project review
Cheakamus River Km 6.5 side channel re-watering
project

• Successful partnerships
• Targets achieved
• Dimensional
• Structural
• Discharge
• Budget
• Adults entered within hours
• Target juveniles captured in first survey

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 37
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Lessons learned
Cheakamus River Km 6.5 side channel re-watering
project

• Build partnerships
• Utilize skills, and experience
• Use proven structural designs
• Adapt to local site conditions
• Photo monitoring stations
• Mechanical anchors
• Quick to install, versatile, sturdy
• Scheduling equipment

Rivers Restoration Northwest Symposium, February
2008Presented by Peter Frederiksen
Slide 38
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Cheakamus River Km 6.5 side channel re-watering
project
Peter Frederiksen, CPESC, Triton Environmental
Consultants Ltd. pfrederiksen_at_triton-env.com Carl
Halvorson, Property Manager, North Vancouver
Outdoor School Luanne Patterson, Environmental
Protection Officer, Canadian National
Railway Jeff Thorlacius, Triton Environmental
Consultants Ltd. Thank-you Cheakamus ecosystem
recovery www.certc.ca
Slide 39