WELCOME Paris Flood Risk Mitigation Municipal Class Environmental - - PowerPoint PPT Presentation

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WELCOME Paris Flood Risk Mitigation Municipal Class Environmental Assessment Public Information Centre No. 2 Paris Fairgrounds Exhibition Centre Tuesday January 14, 2020 6:00 pm - 7:30 pm Presentation at 6:30 pm Content Introduction

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WELCOME Paris Flood Risk Mitigation Municipal Class Environmental Assessment

Public Information Centre No. 2 Paris Fairgrounds Exhibition Centre Tuesday January 14, 2020 6:00 pm - 7:30 pm Presentation at 6:30 pm

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Introduction Historical Context Existing Flood Mitigation Strategies Overview of Class EA Activities Presenting the Preferred Management Strategy Next Steps Questions

Content

County of Brant Public Information Centre

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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

County of Brant Public Information Centre

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Paris

County of Brant Public Information Centre

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Regulatory Flood Event

County of Brant Public Information Centre

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Historical Flooding Events

County of Brant Public Information Centre

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

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January 1979 Ice Jam Flooding

Historical Flooding Events

County of Brant Public Information Centre

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March 1979 Ice Jam Flooding

Historical Flooding Events

County of Brant Public Information Centre

Floodwaters affected residents of Willow and Elm Streets in Paris

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Project Overview

County of Brant Public Information Centre

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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

County of Brant Public Information Centre

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.

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Class EA Activities

County of Brant Public Information Centre

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

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Alternative Solutions

County of Brant Public Information Centre

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

n 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

n 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

n dykes.

Reconstruct and raise dykes with a stability factor of less than 1.0.

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Example Cross Section Concepts – GW2 and N1

County of Brant Public Information Centre

N1 GW2

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Easement Requirements

County of Brant Public Information Centre

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Implementation Plan

County of Brant Public Information Centre

The following list shows a potential implementation schedule, based

n the prioritization score of each

section.

Priority List

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Next Steps

County of Brant Public Information Centre

PIC #1 July 11, 2019 PIC #2

Jan. 14, 2020

Study Completion Spring 2020 Construction 2021?

 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)

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