1

Wabagishik Generating StationSpillway Replacement Project

2018-02-26Beaver Lake Sports & Cultural Club

2

1. Wabagishik GS Location & History

2. Dam Safety Management

3. Engineering Options

4. Supporting Study Work to Confirm Option

5. Proposed Project Timeline

3

Spanish & Vermilion River Watersheds

Wabagishik GS

4

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

5

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

6

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

7

Proposed Design

3 x 17’1” Vertical LiftGates

1 x 17’1” Flap Gate

Upstream Stop Logs

ImmediatelyDownstream ofExisting Spillway

8

Supporting Works

9

Supporting Study Work

• Hydrodynamic Modeling- Water levels- Flow regimes- Sediment transport- Walleye spawning habitat

• Fish Community Study

• Species at Risk Surveys

10

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

11

Hydrodynamic ModelingFlow Regimes

12

Hydrodynamic ModelingSediment Mobility

13

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)

14

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

15

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

16

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

17

2018

2019 2020 2021

18

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

19