BROADVIEW AND EASTERN FLOOD PROTECTION
Class Environmental Assessment Project
PUBLIC INFORMATION CENTRE #1
DECEMBER 5, 2018 Welcome
• Introduction to the project PRESENTATION AGENDA • Seek your feedback • Part 1: Setting the Stage
• Part 2: Project Background and Context
• Part 3: Project Challenges
• Part 4: Alternative Options
• Part 5: Next Steps PART 1: SETTING THE STAGE
Flooded Don River, as seen from south of the Bloor Viaduct, 1918 Source: City of Toronto Archives MUNICIPAL CLASS EA PROCESS
Problem Alternative Design Concepts Environmental Implementation & Opportunity Options for Preferred Study Report Detailed Design Options (ESR)
1 2 3 4 5 PIC #1 PIC #2 ESR review December 5 anticipated anticipated Pending EA March 2019 April 2019 approval & funding INTRODUCTION TO THE AREA INTRODUCTION TO THE AREA
Land Ownership INTRODUCTION TO THE AREA
Lower Don Transformation PART 2: PROJECT BACKGROUND + CONTEXT
Don River flood south of Wilton Avenue, 1920 Source: City of Toronto Archives FLOOD RISK 101
What is a floodplain? The area beside a watercourse that would be covered in water by a flood event.
What is a Regulatory flood? What is a Special Policy Area? REGULATORY FLOOD – HURRICANE HAZEL 1954
1700 That’s a lot of 1600 1500 water! 1400 1300 1200 1100
1000
/s) 3 900 800
Flow (m Flow 700 600 500 400 300 200 100 0 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year 350-Year Regulatory Flood Storm LOWER DON SPECIAL POLICY AREA
• Study Area currently within the Lower Don SPA
• Allows development permitted by existing Official Plan land use designations and policies
• Does not allow for intensified land uses (e.g., commercial to residential, increased density) in the floodplain REDUCING THE LOWER DON FLOOD PLAIN
Lower Don River West Remedial Flood Protection Project – 2005 BEFP (Spill Zone 3) Study Area REDUCING THE LOWER DON FLOOD PLAIN
Flood Protection Landform (Corktown Common) Completed 2012 & Don River Bridge Widening (Completed 2007) - Enables development in the West Don Lands
BEFP Study Area REDUCING THE LOWER DON FLOOD PLAIN
Port Lands Flood Protection and Enabling Infrastructure – Completion 2022
Will Enable Development of Port Lands, Lower Don Area BEFP Study Area
Remaining flood risk following implementation of the Port Lands Flood Protection and Enabling Infrastructure Project REDUCING THE LOWER DON FLOOD PLAIN
Port Lands Flood Protection and Enabling Infrastructure Due Diligence Study Projects previously approved and underway REDUCING THE LOWER DON FLOOD PLAIN
Projects previously approved and underway Port Lands and South of Eastern Transportation and Servicing Master Plan REGULATORY FLOOD INUNDATION WHY NOW?
Why is this project necessary?
Regulatory Flood Water Surface Elevation BROADVIEW AND COMMISSIONERS CLASS EA
Phase 1 Phase 2 TTC RELIEF LINE
Future station entrances (conceptual locations) METROLINX SMART TRACK UNILEVER PRECINCT SECONDARY PLAN & EAST HARBOR DEVELOPMENT PART 3: PROJECT CHALLENGES
Don River, looking north west across Yonge St. bridge, 1954 Source: City of Toronto Public Library PROJECT CHALLENGES
Integration with parallel projects PROJECT CHALLENGES Integration with underground infrastructure
Bell Infrastructure (abandoned and active) Enbridge Gas Main (abandoned and active) Imperial Oil, Trans. Northern, & Sun Oil Pipelines Toronto Hydro Water Main Sanitary Sewer Combined sewer
Additionally: • Lower Level Interceptor sewer system • Power lines • Abandoned infrastructure PROJECT CHALLENGES
Subsurface geotechnical conditions for flood protection purposes PART 4: FLOOD PROTECTION STRUCTURES AND LANDFORMS
Hurricane Hazel Cleanup, 1954 Source: Library and Archives Canada WHAT IS A FLOOD PROTECTION STRUCTURE?
Traditional engineering measures that rely on a structural component to hold back water (dams, flood walls, and dykes/berms) WHAT IS A FLOOD PROTECTION LANDFORM?
FLOOD LINE
NOT TO SCALE
FLOOD LINE
TO SCALE
PART 5: ALTERNATIVE OPTIONS
Hurricane Hazel Cleanup, 1954 Source: torontodreamsproject.blogspot.com ALTERNATIVE OPTIONS FOR FLOOD PROTECTION
3. Flood Protection 2. Improving Landform Conveyance
4. Flood 1. Do-Nothing Protection Structure OPTION 1 – DO-NOTHING
Addressing Existing Spill into the Unilever Precinct OPTION 2 – IMPROVING CONVEYANCE – CHANNEL WIDENING
• Amount of widening that could be reasonably implemented ~14m
• Modeling indicated no measurable improvement in upstream conveyance or reduction in flooding north of the railway OPTION 3 – FLOOD PROTECTION LANDFORM – RAMP REMAINS OPTION 3 – FLOOD PROTECTION LANDFORM – RAMP REMOVED OPTION 4 – FLOOD PROTECTION STRUCTURE – RAMP REMAINS OPTION 4 – FLOOD PROTECTION STRUCTURE – RAMP REMOVED PART 6: NEXT STEPS
Hurricane Hazel Cleanup, 1954 Source: historyinphotos.blogspot.com PROJECT COORDINATION
The City of Toronto, TRCA, Waterfront Toronto, Metrolinx, TTC and other Stakeholders are working cooperatively on:
• Design Coordination • Construction planning • Traffic analysis • Communications plan TIMELINE NEXT STEPS/FEEDBACK
• How you use and experience this area – what's important to you?
• Construction or operation?
• Feedback: –E-mail or mail your comment sheet –Website and fill out the comment form –Call Questions & Answers