Hazard zone of the PPRN flooding by overflow of the Seugne and movement of terrain of the municipality of Jonzac in Charente-Maritime.

Area exposed to one or more hazards represented on the hazard maps used for the risk analysis of the RPP. Hazard maps are the result of the study of hazards, the objective of which 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 study perimeter constituting a graduated zoning according to the level of the hazard. The assignment 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-random PPRNs, each zone is usually identified on the hazard maps by a code for each hazard to which it is exposed. All hazard areas shown on the hazard maps are included. Areas protected by protective works must be represented (possibly in a specific way) because they are always considered subject to hazard (case of rupture or insufficiency of the structure). Hazard zones can be described as elaborated data to the extent that they result from a synthesis using several calculated, modelled or observed hazard data sources. These source data are not concerned by this class of objects but by another standard dealing with the knowledge of hazards. Some areas of the study perimeter are considered “zero or insignificant hazard areas”. These are the areas where the hazard has been studied and is zero. These areas 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 prescribing zone (see definition of ZonePPR class).