Abstract
In recent years, much has been written about the risks inherent to interdependencies among Critical Infrastructures (CIs). These infrastructures have become increasingly automated and interlinked and this linkage between CIs results in a highly complex and dynamic system which increases their vulnerability to cascading and domino effects. Four main types of interdependencies among CIs can be distinguished: physical, cybernetic, geographic and logical. This paper addresses the problematic of physical interdependencies. It presents two types of tools for managing physical interdependencies that were developed by the Centre Risque & Performance (CRP) at the Ecole Polytechnique de Montreal in partnership with some of the CIs present in Montreal and Quebec city. More specifically, this paper analysis the physical dependencies of CIs towards the telecommunications and the electrical systems and shows how it is possible to use these tools to identify, characterize and rank the interdependencies among CIs, understand and anticipate domino effects and plan protection and mitigation measures.
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