Map Viewing Service (WMS) of the dataset: PPRN hazard zone flooding by overflow of the Charente River on the commune of Rouffiac in Charente-Maritime

Area exposed to one or more hazards represented on the hazard maps used for risk analysis of the RPP.
Hazard maps are the result of the study of hazards whose objective is to assess the intensity of each hazard at any point in the study area. 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.
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 represented on the hazard maps 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.
Some areas within the study area are considered “no or insignificant hazard zones”. These are the areas where the hazard has been studied and is nil. 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 RPPs, regulatory zoning may classify certain areas not exposed to hazard as prescribing areas (see definition of the PPR class).

本数据集类指代用于风险保护计划（RPP）风险分析的灾害地图上所标注的、受一种或多种灾害影响的区域。灾害地图是各类灾害研究的成果，其核心目标为评估研究区域内任意点位的各灾害强度。针对不同灾害类型，需采用专属评估方法，据此在研究范围内划定若干区域，并依据灾害等级进行分级分区。在研究区域内的给定点位分配灾害等级时，需综合考量危险现象的发生概率及其强度等级。针对多随机风险保护区域网络（PPRNs），通常会通过对应各灾害的编码，在灾害地图上标识各分区所暴露的灾害类型。灾害地图上标注的所有灾害影响区域均需纳入本类范畴。受防护结构保护的区域亦需予以标注（可采用专属标注方式），因为此类区域仍存在灾害风险，例如防护结构失效或防护能力不足的场景。灾害分区可作为经整合加工的数据集进行描述，其生成依托多源计算、建模或观测得到的灾害数据。此类源数据不属于本对象类的范畴，而应由另一项针对灾害认知的标准规范进行处理。研究区域内部分区域被划为“无灾害或灾害可忽略区域”，即经研究确认灾害强度为零的区域。此类区域不属于本对象类范畴，亦无需作为灾害分区进行标注。但针对天然风险保护计划（PPR），监管分区可将未受灾害影响的区域划定为规定区域（详见风险保护计划（PPR）类的定义）。