Final Report - Vulnerability Committee

Flood Control Dam Water Resources Infrastructure Assessment -Final ReportToronto and Region Conservation Authority Flood Control DamsTable 4-2Design Life of Infrastructure SystemsSystemDesign Life*Administration / Operation80-100 years for physical structuresIndefinite for personnel, procedures, and recordsReservoirIndefiniteSpillway Structures80 years (Civil)Mechanical Systems50 yearsEmbankment Dams> 100 yearsGroundwater Drainage / Management Systems50 yearsElectric Power Supply30 yearsControl and Monitoring Systems20 yearsCommunications10 yearsSafety Systems10 years* Ref: EPRI: Hydropower Plant Modernization Guide, 1989.The systems noted above which have anticipated design lives of 30 years or less will require significantregular upgrades to maintain their serviceability. Based on the maintenance practices described in thedams’ Operation, Maintenance and Surveillance (OMS) Manuals, TRCA has been adequatelymaintaining these facilities. However, there will be significant maintenance required in the near future asthe dams approach the mid point of their anticipated design lives.The Claireville Dam was constructed in 1963 – 1964 and the G. Ross Lord Dam was constructed in 1973.Based on a general useful life of 80 to 100 years, the dams have 40-60 years of useful life remaining.This timeframe of the remaining service life for both dams corresponds with the future climate projectionperiod of 2050’s.4.2.5 State the GeographyBoth of the dams under consideration of this study are located in the Greater Toronto Area which is aheavily developed, urban environment, which likely has influence on the microclimate experienced inSouthern Ontario.Inherently dams are located in river valleys; therefore, the upstream drainage basin has a significantinfluence on the flows experienced at the dams. While this geographic feature will not have an impact onthe climate parameters, future climate changes may have a significant influence on the flows in theHumber and West Don Rivers. As earlier discussed, the hydrologic and hydraulic response of thewatershed catchment areas upstream of the dams is outside the scope of this study.4.2.6 State Specific Jurisdictional ConsiderationsAs required by the Protocol, this section provides a list of jurisdictions, laws and bylaws, regulations,standards, guidelines, and administrative processes that are relevant to the infrastructure. This list isprovided in this report for the purposes of completeness, and is not directly applied to the assessment ofthe infrastructure.Jurisdictions that have direct control or influence on the infrastructure are as follows:Toronto and Region Conservation Authority (TRCA)Sections of laws and bylaws that are relevant to the infrastructure are as follows:Local Municipal BylawsMunicipal Building Codes and Site Plan ApprovalsGENIVAR 4-21