Dataset Direct Download Service (WFS): PPRN hazard zone flooding by overflow of the Charente River in the commune of Salignac-sur-Charente 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).本类对象指代用于RPP（RPP）风险分析的危害图中所标注的、受一种或多种危害影响的区域。危害图是危害研究的成果，该研究的目标为评估研究区域内任意点位的各类危害强度。针对不同危害类型，需采用专属评估方法，最终在研究范围内划定若干区域，形成按危害等级分级的分区结果。针对辖区内特定点位的危害等级赋值，需综合考量该危险现象的发生概率及其强度等级。针对多随机PPRN（PPRN）场景，危害图上的每个分区通常会依据其所暴露的每种危害类型分配专属编码，以此完成标识。本类对象涵盖危害图上标注的全部危害区域。设有防护结构的区域也必须进行标注（可采用特定标注方式），因为即便设置了防护结构，仍存在结构失效或防护不足的风险，此类区域始终被视为处于危害影响范围内。危害分区可被视为衍生数据：其生成过程需整合多源的计算、建模或实测危害数据。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害认知的标准进行管理。研究区域内的部分区域被归类为“无危害或危害可忽略区域”，即经研究确认无危害的区域。此类区域不属于本类对象范畴，无需作为危害分区进行标注。但针对天然RPP（RPP）场景，监管分区可能会将未受危害影响的部分区域划定为规定区域（详见PPR（PPR）类别的定义）。