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 Historical Context Existing Flood Mitigation Strategies Overview of Class EA Activities Presenting the Preferred Management Strategy Next Steps Questions County of Brant Public Information Centre
Introduction 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. County of Brant Public Information Centre
Paris County of Brant Public Information Centre
Regulatory Flood Event County of Brant Public Information Centre
Historical Flooding Events High water during the 1947 flood. –Paris Museum & Archives The high level of the Grand River is shown under the The back of the Grand River Street shops (1912). – Paris Museum William Street Bridge in downtown Paris in the flood of and Archives May 1974. –Paris Museum & Archives The intersection of Mechanic Street and West River Street during A view of the high waters looking towards a home on Elm Street, Volunteers place sandbags alongside the Grand with the William Street bridge in the background (1912). – Paris the flood of 1947. – Paris Museum and Archives River before the flood of May 1974. – GRCA Museum and Archives County of Brant Public Information Centre
Historical Flooding Events January 1979 Ice Jam Flooding County of Brant Public Information Centre
Historical Flooding Events March 1979 Ice Jam Flooding Floodwaters affected residents of Willow and Elm Streets in Paris County of Brant Public Information Centre
Project Overview County of Brant Public Information Centre
Condition Assessment The following site investigations were completed as part of the “Paris Flood Protection Condition Assessment” completed in April 2019. Studies Completed Study Findings Visual Condition Assessment Dykes require maintenance • • Geotechnical Assessment Portions of the dykes do not meet stability • • • Building Inspections factors of safety • Stability Analysis • Portions of dykes do not provide protection • Hydraulic Assessment against the 100-year flood. County of Brant Public Information Centre
Class EA Activities 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 County of Brant Public Information Centre
Alternative Solutions Increase Level of Increase Level of Protection to Undertake Maintenance Do Nothing Protection to 100-Year Regulatory and Repair Activities Flood Level (Approximately 500- Year) Flood Level Reconstruct and raise Reconstruct and raise Maintain current location dykes and walls to the dykes and walls to the and height of dykes. Regulatory flood 100-year flood elevation elevation plus 0.3 m plus 0.3 m freeboard (to No improvements or freeboard (to account for account for climate changes. climate change impacts). change impacts). Remove or relocate trees and overgrown vegetation on dykes. Remove or relocate trees Remove or relocate trees and overgrown vegetation and overgrown vegetation on dykes. on dykes. Repair retaining walls to address localized failures. Leads to further deterioration and Reconstruct and raise Reconstruct and raise potential dyke failure. Reconstruct dykes with dykes with a stability dykes with a stability stability factor of less than factor of less than 1.0. factor of less than 1.0. 1.0. County of Brant Public Information Centre
Example Cross Section Concepts – GW2 and N1 GW2 N1 County of Brant Public Information Centre
Easement Requirements County of Brant Public Information Centre
Implementation Plan Priority List The following list shows a potential implementation schedule, based on the prioritization score of each section. County of Brant Public Information Centre
Next Steps Study PIC #2 Construction PIC #1 Completion July 11, 2019 Jan. 14, 2020 2021? Spring 2020 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) County of Brant Public Information Centre
Questions County of Brant Public Information Centre
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