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Wabagishik Generating StationSpillway Replacement Project
2018-02-26Beaver Lake Sports & Cultural Club
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1. Wabagishik GS Location & History
2. Dam Safety Management
3. Engineering Options
4. Supporting Study Work to Confirm Option
5. Proposed Project Timeline
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Spanish & Vermilion River Watersheds
Wabagishik GS
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Wabagishik GS Spillway
• Constructed by the LornePower Company 1908
• Main dam with spillway withsix 10-ft stop log openingsand a log flume
• Modified over the years,adding ogees and replacingtwo of the stop log openingsat the south end with avertical-lift ‘waste gate’
• Owned and operated byVale, in accordance with(draft) SVRWMP
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Dam Safety: Project Driver
Life Safety Environment
Property CulturalHeritage
Vale Dam Safety Management Program- Dam Safety Inspections (DSI)- Dam Safety Reviews (DSR)- Operations, Maintenance, Surveillance- Prioritization of Dam Safety projects
Dam safety inspections and routine operator reviews identified safety andstability issues with the spillway at the Wabagishik GS, specifically deteriorationof the concrete.
Dam Safety Review/Assessment (2016)- Hazard Potential Classification: Moderate- Directs design criteria, monitoring
- IDF pass 1:100yr, not fail under 1:1000yr
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Wabagishik GS Spillway Options Review
• Options for rehabilitation or replacement of the spillway structure wereconsidered through engineering studies• Rehabilitation discounted early due to compromised condition of
existing concrete• Various configurations and sizes of lift gates considered
• All options designed and reviewed against goals to:• Maintain current conditions and operations with no changes to water
management or water levels upstream or downstream of thegenerating station
• Pass 1:100 year flood and not fail under the 1:1000 year event
• Preferred option identified
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Proposed Design
3 x 17’1” Vertical LiftGates
1 x 17’1” Flap Gate
Upstream Stop Logs
ImmediatelyDownstream ofExisting Spillway
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Supporting Works
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Supporting Study Work
• Hydrodynamic Modeling- Water levels- Flow regimes- Sediment transport- Walleye spawning habitat
• Fish Community Study
• Species at Risk Surveys
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Hydrodynamic ModelingPredicted Water Levels
500m3/s with powerhouse at full capacityNotes:1. Only downstream model outputs are shown, as upstream water management willremain the same under existing and proposed spillway configuration2. Representative model outputs showing are shown; models were run with 11inflows and under two powerhouse operating scenarios
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Hydrodynamic ModelingFlow Regimes
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Hydrodynamic ModelingSediment Mobility
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Walleye Spawning HabitatPotential Changes to Spawning Days, Area, Productivity
Existing
Proposed
Suitable Spawning Days 2001-2011 Suitable Spawning Area
Model Year Change fromExisting (%) Model Year Change from
Existing (%)
2001 -0.4 2007 -0.12002 0.0 2008 -0.32003 0.2 2009 -0.22004 0.4 2010 0.02005 -0.1 2011 -0.42006 -0.2 Average -0.1
Spawning Productivity (m2∙day)
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Fish Community Assessment• Characterize upstream and downstream
(Wabagishik Lake) fish communities to fill WMPdata gap and inform construction considerations
• Boat electrofishing and shore work 2017, tocontinue in 2018
• Same species captured in both lake environments;silver redhorse sucker the only species that wascaptured downstream and not upstream
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Species at RiskSurvey program developed with MNRF
Basking Turtle Surveys• Painted and Snapping, no
Blanding’s
Barn Swallow Nesting (none)
Eastern Whip-poor-will (none)
Bat Acoustic Monitoring, Exit Surveysand Dam Inspection
• 7 species of bat recorded• foraging over wooded area, not
considered roosting habitat• clearing timelines recommended
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Proposed Project Timeline
2018
2019
2020
2021
Access & LaydownDetailed Engineering
Letter of Authorization(MNRF)
Conservation AuthorityAct Approval (NDCA)
Log Chute Removal½ Spillway
½ SpillwayOld Spillway Removal
West Gravity DamOld Waste Gate Removal
Class EA (MNRF)
Lakes & RiversImprovement ActApproval (MNRF)
Fisheries Act Review(DFO)
Conservation AuthorityAct Approval (NDCA)
Navigation Protection ActReview (Transport
Canada)
CofferDams
Erosion &SedimentControl
ClearingTimelines S
takeholderEngagem
ent
2017 Initial Project Applicationto MNRF
Design & Construction Mitigation Permits & Approvals
SupportingStudies
Engineering Options
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2018
2019 2020 2021
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Summary Timeline + Next Steps
ongoing Engineering Studies & Design
2017 Mar Hydrodynamic Modeling & Assessment
2017 spring SAR Surveys
2017 Jun Project Description Submitted to MNRF
2017 summer Fisheries Work
2017 Nov Begin Project Introduction to Stakeholders
2017 Dec Update Meeting with MNRF
2018 Jan Application to MNRF (2018 works) and Conservation Sudbury (all works)
2018 spring/summer Access Road and Lay Down Area Construction, pending permits
2018 fall Engineering Anticipated to be Complete
2018 Q4 Updated permit applications to all regulators
2019 spring Spillway Replacement Project Initiation
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