GRAVONA PPRI hazard zone

Area exposed to one or more hazards represented on the hazard map used for the risk analysis of GRAVONA PPRI. The hazard map is the result of the inondaiton risk studies conducted by SOGREAH in 1995 and 1996 which led to the development of the first GRAVONA PPRI approved on 24/08/1999. A further study by SOGREAH in 2000 to update the flood risk between RN 196 and the sea changed the hazard in this area, particularly at the airport. The evaluation method is specific to each hazard type. It leads to the delimitation of a set of areas on the study perimeter constituting a zoning graduated according to the level of the hazard. The allocation of a hazard level at a given point in the territory takes into account the probability of occurrence of the dangerous phenomenon and its degree of intensity. All hazard areas shown on the hazard map are included. Areas protected by protective structures must be represented (possibly in a specific way) as they are always considered subject to hazard (case of breakage or inadequacy of the structure). Hazard zones can be described as developed data to the extent that they result from a synthesis using multiple sources of calculated, modelled or observed hazard data. These source data are not concerned by this class of objects but by another standard dealing with the knowledge of hazards.