L'historien, l'hydraulicien et l'hydrologue et la connaissance des inondations

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This paper presents three "Historisk" projects, based on the collaboration between historians, archivists, hydraulicians and hydrologists for a better assessment of the flood risk. On the Isère river, a historical investigation allowed to rank the 1600-2000 floods into three classes, using criteria based on the flood damages. On the Guiers river, a hydraulic modelling provided a review of a historical discharge estimate available in a document from the XIX^th century. On the Ardeche river, a detailed hydraulic modelling provided a discharge estimate of the main floods during the XIX^th and XX^th centuries, with an error analysis.