WELCOME Paris Flood Risk Mitigation Municipal Class ... · Paris Flood Risk Mitigation Municipal...
Transcript of WELCOME Paris Flood Risk Mitigation Municipal Class ... · Paris Flood Risk Mitigation Municipal...
WELCOMEParis Flood Risk Mitigation
Municipal Class Environmental Assessment
Public Information Centre No. 2
Paris Fairgrounds Exhibition CentreTuesday January 14, 2020
6:00 pm - 7:30 pmPresentation at 6:30 pm
Introduction
Historical Context
Existing Flood Mitigation Strategies
Overview of Class EA Activities
Presenting the Preferred Management Strategy
Next Steps
Questions
Content
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Study Purpose
The purpose of the Class EA study is to review alternatives to further mitigate flood risks in Paris. Existing Paris Flood Protections Works were completed in 1979 and are in need of maintenance and enhancements. There are existing public and private assets that need to be protected along with a risk to public safety that must be mitigated.
Why now?
A condition assessment was completed in April 2019. This investigation found that the flood protection works are in need of maintenance.
The use of updated modelling techniques has found that the level of protection currently in place may not be as high as previously understood.
The County of Brant has received Federal funding to undertake this study.
Introduction
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Paris
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Regulatory Flood Event
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Historical Flooding Events
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The high level of the Grand River is shown under the William Street Bridge in downtown Paris in the flood of May 1974. –Paris Museum & Archives
Volunteers place sandbags alongside the Grand River before the flood of May 1974. – GRCA
The intersection of Mechanic Street and West River Street during the flood of 1947. – Paris Museum and Archives
High water during the 1947 flood. –Paris Museum & Archives
A view of the high waters looking towards a home on Elm Street, with the William Street bridge in the background (1912). – Paris Museum and Archives
The back of the Grand River Street shops (1912). – Paris Museum and Archives
January 1979 Ice Jam Flooding
Historical Flooding Events
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March 1979 Ice Jam Flooding
Historical Flooding Events
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Floodwaters affected residents of Willow and Elm Streets in Paris
Project Overview
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The following site investigations were completed as part of the “Paris Flood Protection Condition Assessment” completed in April 2019.
Condition Assessment
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Studies Completed• Visual Condition Assessment• Geotechnical Assessment• Building Inspections• Stability Analysis• Hydraulic Assessment
Study Findings• Dykes require maintenance• Portions of the dykes do not meet stability
factors of safety• Portions of dykes do not provide protection
against the 100-year flood.
Class EA Activities
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Completed EA Activities
• Hydraulic Modelling
• Natural Heritage Investigations
• Fluvial Geomorphological Assessment
• Cultural Heritage
• Archaeology
• Flood Damages Assessment
• Develop Alternatives
• Evaluate Alternatives
• Selection of Preferred Alternative
Enhancements
• Flood Emergency Response Plan - ongoing
• Interior Drainage Assessment - ongoing
Alternative Solutions
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Do Nothing
No improvements or changes.
Leads to further deterioration and
potential dyke failure.
Undertake Maintenance and Repair Activities
Maintain current location and height of dykes.
Remove or relocate trees and overgrown vegetation
on dykes.
Repair retaining walls to address localized failures.
Reconstruct dykes with stability factor of less than
1.0.
Increase Level of Protection to 100-Year
Flood Level
Reconstruct and raise dykes and walls to the
100-year flood elevation plus 0.3 m freeboard (to
account for climate change impacts).
Remove or relocate trees and overgrown vegetation
on dykes.
Reconstruct and raise dykes with a stability
factor of less than 1.0.
Increase Level of Protection to Regulatory
(Approximately 500-Year) Flood Level Reconstruct and raise dykes and walls to the
Regulatory flood elevation plus 0.3 m
freeboard (to account for climate change impacts).
Remove or relocate trees and overgrown vegetation
on dykes.
Reconstruct and raise dykes with a stability
factor of less than 1.0.
Example Cross Section Concepts – GW2 and N1
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N1
GW2
Easement Requirements
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Implementation Plan
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The following list shows a potential implementation schedule, based on the prioritization score of each section.
Priority List
Next Steps
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PIC #1July 11, 2019
PIC #2Jan. 14, 2020
Study CompletionSpring 2020
Construction2021?
Finalize preferred alternative design considering public feedback
Completion of Project Report
Notice of Completion and 30-day public review period
Detailed design and construction (not part of this project)
Questions
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