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Cet article interroge les relations entre la gestion et la communication sur le risque inondation dans les politiques d'amenagement de trois agglomerations du bassin de la Loire : Saint-Etienne, Orleans et Nantes. Dans cette perspective, l'analyse multiscalaire realisee genere de nombreux enseignements sur la maniere de communiquer sur le risque, de le traduire en termes de planification et de le mettre en oeuvre au niveau des amenagements urbains : les resultats sont parfois contradictoires. Quelles que soient les dynamiques demographiques et economiques des trois villes, le principe de « vivre avec le risque » fait consensus. Toutefois, sa retranscription dans les politiques urbaines reste lacunaire. Si des efforts de communication sont presents a l'echelle d'une agglomeration, ceux-ci se diluent mal au fur et a mesure que les echelles d'intervention se rapprochent de l'individu. Le risque d'inondation apparait alors comme le principal oublie des amenagements entrepris a l'echelle du quartier. Abstract The paper draws the links between flood management and risk communication concerning planning policies and especially urban projects. We study three French case studies, along the Loire valley : Saint-Etienne, Orleans and Nantes. For this purpose, spatial multiscalar analysis gives an overview on the potential contradictions and loss of information between risk communication, spatial planning and urban project. We demonstrate that whatever demographic and economic trends are observed, the city is growing closer and closer to flooding areas. Can we really live with the risk ? The paper will try to answer on the communication level. On one hand, the consensus seems to be strong to go on urban growth spread near the water. On the other hand, very few are done on public information. Some innovative practices have to be highlighted concerning legal rules for communication at municipal scale. However, risk communication is fading step by step at neighborhood scale.

Les projets urbains en zones inondables communiquent-ils sur les risques ?