Dataset Direct Download Service (WFS): PPRN hazard zone flooding by overflow of the Charente River in the commune of St-Sever-de-Saintonge 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).本数据集涵盖用于RPP风险分析的危险地图（hazard map）上标注的、暴露于一种或多种危险的区域。 危险地图是危险研究的成果，该研究的目标是评估研究区域内任意点位的各类危险强度。针对不同危险类型需采用专属评估方法，以此在研究范围内划定一系列区域，形成按危险等级分级的分区方案。 在研究区域内的特定点位确定危险等级时，需综合考量危险现象的发生概率及其强度等级。 对于多随机PPRN而言，危险地图上的每个分区通常会通过其所暴露的各类危险对应的编码进行标识。 危险地图上标注的所有危险区域均需纳入本数据集。受防护结构保护的区域亦需标注（可采用专属方式），因为即便设有防护结构，该区域仍可能因结构破损或防护不足而面临危险。 危险分区可视为经整合加工的数据：其整合基础为多源的计算、建模或观测得到的危险数据。本类对象不涵盖这些源数据，相关源数据需遵循另一项针对危险认知的标准进行管理。 研究区域内部分区域被视为“无危险或危险可忽略区域”，即经研究确认无危险的区域。此类区域无需纳入本类对象，亦无需作为危险分区进行标注。但对于天然RPP而言，监管分区可能将部分未受危险影响的区域划定为规定区域（详见PPR类别的定义）。