Les logiques d'urbanisation dans les plaines alluviales du bassin versant de la Vilaine
Résumé
Brittany (North-western France) was seriously affected by several hydrological crisis over the last twenty years. This crisis indicated some urban spaces vulnerability and induces to revise the urban logic's plan. This urbans spreading shown an organisation from the initial point which can be vulnerable. Three cities are examples of peripheral urbanisation of a metropolis and the urban areas have grown partly in flooding areas. This urban areas raises the question of regulation and the climatic constraints. What emerges from that is a period where the conscience of the risk was relatively absent and followed by a tightening payment.