To the north of the Alpes-de-Haute-Provence, the Serre-Ponçon dam and its 1.2 billion m³. To the east, the Verdon reservoirs. Sainte-Croix: 767 million cubic hectometers. Quinson: 18.5 million hm³. Gréoux-les-Bains: 78.5 million.
The Alpes-de-Haute-Provence department is concerned by the risk of rupture of several dams – those mentioned being the most significant.
Until June 21, it is possible to find out more about what would happen at that time. The cause ? A human act (malice, act of war) or natural act (earthquake, landslide, exceptional flood), impacting the structure from the point of view of security and surveillance of structures.
A specific flood zone
It is then that the Special Intervention Plan would come into action on three types of areas likely to be flooded downstream of the dam: Those called immediate proximity (ZP), “zone which, following the total or partial rupture of the structure, experiences submersion likely to cause significant damage and whose extent is justified by arrival times of the flow incompatible with the diffusion times of the “alert to neighboring populations by public authorities, with a view to ensuring their safety”; the specific flood zone (ZIS): “zone located downstream of the previous one and stopping at a point where the rise in water level is of the order of that of the highest known floods“, as well as the flood zone, located downstream of the previous one, “where the flood is comparable to a natural flood“.
