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. In France, flooding is the most common and damaging natural hazard (CCR, 2021). Globalwarming is expected to exacerbate flood risk and could be more pronounced inthe European Alps which are experiencing a high warming rate, likely to leadto heavier rainfall events. Alpine valleys are densely populated,potentially increasing exposure and vulnerability to flood hazard. The studyof historical records is highly relevant to understand long-term floodoccurrence and related socio-economic impacts in relation to changes in theflood risk components (i.e. hazard, exposure and vulnerability). To this aim we introduce the newly constituted database of Historical Impacts of Floods in the Arve Valley (HIFAVa) locatedin the French northern Alps starting in 1850. This quite unique database reportshistorical impacts related to impact events occurrences in a well-documentedAlpine catchment that encompasses both hydrological and socio-economicaldiversity. After a complete description of the database (collection, content andstructure), we explore the distribution of the recorded impacts with respectto their characteristics and evolution in both time and space. The analysisreveals that small mountain streams and particularly glacial streams causedmore impacts (67 %) than the main river. While an increase in heavyrainfall and ice melt are expected to enhance flood hazard in small Alpinecatchments, this finding calls for greater attention to flood riskassessment and management in small catchments. The analysis also reveals anincreasing occurrence of impacts from 1920 onwards, for which possiblefactors are discussed. Further work is, however, needed to conclude on therespective contribution of the source effect, the increase in flood hazard,or the exposure of goods and people.

Geo-historical database of flood impacts in Alpine catchments (HIFAVa database, Arve River, France, 1850–2015)