Abstract
Collaboration between historians, archivists and hydrologists can provide a significant improvement in the field of flood hazard studies, by using historical information about floods. This “Historisk” methodology, first applied in 1996 and 1997 on the Guiers river in France (Lang et al., 1998), is herein presented for the Ardeche river, France (Coeur et al., 1999). For this river, historical information is available for the 19th and 20th centuries, since many records from the Ardeche flood warning system are available. Several hydrologists, such as De Mardigny (1860) and Parde (1925) have produced technical reports about the historical floods. The analysis of the different archive sources will allow a qualitative recovery of the most important floods of the two last centuries, and the establishment of a guide presenting the different archive sources about floods. Hydraulic studies will afterwards be carried out for the estimation of historical flood discharges.
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