Risk zone of a PPRN Flooding of the Loir, in Eure-et-Loir (28)

Area exposed to one or more hazards represented on the hazard map used for PPR risk analysis. The hazard map is the result of the hazard study whose objective is to assess the intensity of each hazard at any point in the study area. The assessment method is specific to each type of hazard. It leads to the delimitation of a set of zones on the perimeter of study constituting a graduated zoning according to the level of the hazard. The attribution 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. For multi-hazard PPRNs, each zone is usually identified on the hazard map by a code for each hazard to which it is exposed. All hazard areas shown on the hazard map are included. Areas protected by protective structures must be represented (possibly in a specific way) because they are always considered to be subject to hazard (case of rupture or insufficiency of the structure). Hazards areas can be qualified as elaborate data to the extent that they result from a synthesis using multiple sources of calculated, modelled or observed hazards data. These source data are not concerned by this class of objects but by another standard dealing with knowledge of hazards. Some areas of the study area are considered to be "zero or insignificant hazard areas". These are the areas where the hazard has been studied and is zero. These zones are not included in the object class and do not have to be represented as hazard zones. However, in the case of natural PPRs, regulatory zoning may classify certain areas not exposed to hazard as a prescription area (see the definition of ZonePPR class).