Final Report - Vulnerability Committee

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Flood Control Dam Water Resources Infrastructure Assessment -Final Report1. Introduction1.1 BackgroundThere is definitive evidence to suggest that the climate has changed, and is continuing to change. Climatechange affects infrastructure, creating potential vulnerability in the operation and design of engineeredsystems. Vulnerability may exist because historic climate data is often used to form the basis of thedesign for public infrastructure. However, due to a changing climate, historic data used to design criticalinfrastructure may not reflect the climate of the future. As a result, infrastructure may be vulnerable sinceit may not have sufficient capacity or resiliency to accommodate the conditions created by the changingclimate.To accommodate increased uncertainties and account for climate change in the design and retrofit ofpublic infrastructure, Engineers Canada and its partners have established the Public InfrastructureEngineering Vulnerability Committee (PIEVC). The PIEVC oversees the planning and execution of anational engineering assessment of the vulnerability of Canadian public infrastructure to climate change.The National Engineering Vulnerability Assessment project is a long-term initiative of the Canadianengineering profession to assess the vulnerability of public infrastructure to the impacts of future changesin climate. It is anticipated that the assessment will provide recommendations concerning adjustmentsand amendments to infrastructure codes, standards, and engineering practices to accommodate futureclimate change in infrastructure design. Currently, the PIEVC is studying four categories of infrastructureas follows:BuildingsRoads and associated structuresStormwater and wastewater systemsWater resource management systemsPreliminary studies to examine the current state of each infrastructure, availability of climate data, andindicators of adaptive capacity were completed to modify an engineering protocol. More information canbe obtained from the PIEVC website at www.pievc.ca. The Protocol was evaluated through seven pilotstudies, which are included in the first national assessment report that was completed in April 2008. TheProtocol is further described in Chapter 2.The Toronto and Region Conservation Authority is one of 38 Conservation Authorities in the province ofOntario. Conservation Authorities are local watershed management agencies that deliver services andprograms that protect and manage water and other natural resources in partnership with government,landowners and other organizations, by promoting an integrated watershed approach balancing human,environmental and economic needs. Existing in most areas of Southern Ontario and some areas inNorthern Ontario, Conservation Authorities are organized on a watershed basis.TRCA's area of jurisdiction includes 3,467 square kilometres, 2,506 on land and 961 water-based, and iscomprised of nine watersheds: Carruthers Creek, Don River, Duffins Creek, Etobicoke Creek, MimicoCreek, Highland Creek, Humber River, Rouge River and Petticoat Creek. The six participating partner ormember regional municipalities of the TRCA are the City of Toronto, Regional Municipality of Durham,Regional Municipality of Peel, Regional Municipality of York, Township of Adjala-Tosorontio, and theTown of Mono.Among numerous other functions, many of Ontario's Conservation Authorities including the TRCA, areowners of flood control infrastructure such as dams and engineered channels, and are responsible foroperating and maintaining this infrastructure to protect life and property from the impacts of severe floods.The TRCA owns and operates a number of large and small dams and flood control structures in order tocontrol flooding. The two large dams that are the subject of this study, the G. Ross Lord dam andClaireville Dam, located in the Don River watershed and in the Humber River watershed respectively, areactively operated structures whose operational procedures are integrated with the TRCA FloodGENIVAR 1-1
Flood Control Dam Water Resources Infrastructure Assessment -Final ReportIntroductionForecasting and Warning program. In addition to these large dams, the TRCA owns eight small damsand twenty-three flood control structures across the jurisdiction that are passive structures requiring muchless frequent operation and maintenance. Figure 1.1 shows the TRCA jurisdictional map and indicatesthe location of the Claireville and G. Ross Lord dams relative to the TRCA jurisdiction.Figure 1.1TRCA Jurisdictional MapClairevilleG. Ross Lord1.2 Project DetailsThe Toronto and Region Conservation Authority (TRCA) and Engineers Canada agreed to work togetherto assess the engineering vulnerability of the Claireville and G. Ross Lord flood control dams andreservoirs to the potential impacts of the existing climate and future climate change.1.2.1 ObjectiveThe main objective of this case study is to identify components of the Claireville Dam and reservoir andG. Ross Lord Dam and reservoir which are at increased risk of failure, damage, deterioration, reducedoperational effectiveness, and/or reduced life cycle from potential future climate changes through the useof the PIEVC Protocol and to make recommendations for remedial action and/or further study.1.2.2 ScopeThe study area includes the Claireville Dam and reservoir located at the border between northwestToronto and the City of Brampton, and the G. Ross Lord Dam and reservoir located in north Toronto.Both the dam structures and the upstream reservoirs are included in the study.The study includes an assessment of the vulnerabilities of both facilities to current climate for existingconditions and to future climate change at the 2050 time horizon. It should be noted that the explicitinclusion of the existing conditions is not typical of the previous PIEVC studies. The previous studiesassessed only the future risks, in accordance with the Protocol, whereas this study included theassessment of both the existing and the future risks. This variance from the protocol was incorporatedinto the project during negotiations between TRCA and the PIEVC.GENIVAR 1-2
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Appendix AState of Knowledge Assess
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National Engineering Vulnerability
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Appendix CRisk Assessment WorkshopP
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Introduction - TRCANational Enginee
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Summary of PIEVC ProtocolNational E
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Summary of PIEVC ProtocolAt each st
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Summary of PIEVC ProtocolStep 3: Ri
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Summary of PIEVC ProtocolStep 3: Ri
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Summary of PIEVC ProtocolStep 4: En
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Overview of Dams Review Current “
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General location of the damsNG. Ros
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G. Ross Lord damInfrastructure Comp
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G. Ross Lord damInfrastructure Comp
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Claireville damInfrastructure Compo
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Claireville damInfrastructure Compo
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Climate Analysis & Projections - Ov
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Climate Analysis & Projections - De
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Climate Analysis & Projections - Pr
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Appendix EFinalized Risk Assessment
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Appendix GComparison of Existing an
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Final Report - Vulnerability Committee

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