Abstract : Map-making the centennial floods of the Seine in Paris allows to understand in a new scientific way the relationship between societies and spaces in urban context. Contemporary maps of the flooding of 1740 and 1910 were spatialized in the GIS Alpage and show the impact of floods in the parisian topography. By a dual approach of flooded areas, both chronological and typological, we can measure the consequences of slow process of detachment of the city and the river. This work unveils the specificities of each bank and raises questions about the causes of this different evolution. The containment of the Seine, very tough since the XIXthc., far from causing the end of risk for riverside societies, changed the geography of urban spaces with high risk river, and played a role in the revival of the old channel of the river on the right bank.