Abstract
Quebec's Dam Safety Act demands a safety assessment for all dams, whatever their capacity. The capacity only affects the detail level of the study to qualify the consequences of a potential dam failure, and thus determine the dam's classification. In practical terms, it is difficult to qualify the consequences of a failure flood if a complete hydraulic calculation of the failure flood is not performed. If consequences are not significant, this complicated specialized work can be deemed unnecessary by the dam owner, who normally has to defray the cost. This paper compares results of a complete dynamic calculation to those of three "simplified" methods. It shows, in two specific cases, that flow depth errors are significant, even after eliminating the greater part of this error generated by the discharge evaluation at the breach. The paper also shows that work involved when using "simplified" methods is not significantly decreased with relation to the work required for the complete calculation when time comes to interpret the data to assess correctly the consequences of a possible dam failure.Key words: dam, rupture, consequences, simplified assessment, complete calculation.[Journal translation]
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