Final Report - Vulnerability Committee

Flood Control Dam Water Resources Infrastructure Assessment -Final ReportToronto and Region Conservation Authority Flood Control DamsTable 4-6ScaleSeverity Scale FactorsMethod DMethod ESeverity0 No effect Negligible or Not Applicable1 Measurable 0.0125 Very Low / Unlikely / Rare / Measurable Change2 Minor 0.025 Low / Seldom / Marginal / Change in Serviceability3 Moderate 0.050 Occasional Loss of Some Capability4 Major 0.100 Moderate Loss of Some Capacity5 Serious 0.200 Likely Regular / Loss of Capacity and Loss of Some Function6 Hazardous 0.400 Major / Likely / Critical / Loss of Function7 Catastrophic 0.800 Extreme / Frequent / Continuous / Loss of Asset4.3.3 Use a Spreadsheet to Document the Risk AssessmentA spreadsheet was developed that was comprised of a header row for relevant climate events. The titlecolumn consists of the relevant infrastructure systems and components, and their performance responseto the relevant climate change effects.One feature distinguishing this study from the previous ones is the explicit inclusion of the existing risk.The previous studies assessed only the future risks, whereas this study included both the existing and thefuture risks and the change between the two. Hence, two separate matrices were established using theabove mentioned spreadsheet for each dam to include both the existing and future risks. In total fourmatrices were developed, as follows: Claireville Dam – Existing Climate Conditions (2009)Claireville Dam – Future Climate Conditions (2050s) G. Ross Lord Dam – Existing Climate Conditions (2009)G. Ross Lord Dam – Future Climate Conditions (2050s)A sample spreadsheet is provided in Table 4-7.GENIVAR 4-25