Abstract : France is subjected to several types of natural phenomena (floods, earthquake, landslides, storms, forest fires...) and to attacks potentially generated by human activities (industrial facilities, nuclear power plants, transportation of dangerous goods...). The natural and technological risks are managed in France, as regards prevention, protection, intervention, in order to limit their human and economic consequences. Furthermore, an industrial accident could be triggered by a natural event. This paper explains how France is prepared to face this kind of disaster (called "natech disaster"). The description of the French approach is illustrated by the feedback of two recent major events (storm in December 1999, flood in South of France in September 2002).