L'information historique des inondations : l'histoire ne donne-t-elle que des leçons ?

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Harmonisation among land use planning and natural hazard is now to be improved by the use of historical information. Collaboration between historical and geophysical sciences is intended to give methodological advances, by ensuring the quality of data collection and the technical data processing. This paper presents hydrological and hydraulic requirement for historical information, then the interest of a history of natural hazard, and finally two examples of historical flood studies on Ardèche and Isère rivers.