Dataset Direct Download Service (WFS): PPRN hazard zone flooding by overflow of the Charente River on the commune of Chaniers 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).

本数据集指代用于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类灾害强度。针对不同灾害类型，需采用专属的评估方法，由此在研究范围内划定一系列区域，形成按灾害等级分级的区划。为境内某一特定点位分配灾害等级时，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场景，每个区域通常会在灾害地图上依据其所受的各灾害类型分配对应的编码以完成标识。
所有在灾害地图上标注的灾害区域均需纳入本数据集。受防护结构保护的区域也必须进行标注（可采用专属方式），因为即便有防护结构，仍存在结构失效或防护不足的可能，此类区域始终被视为处于灾害影响范围内。
灾害区域可被视为经加工的数据集，其生成过程需整合多源的计算、建模或观测所得的灾害数据。本数据集类别不涵盖这些源数据，相关源数据由另一项聚焦灾害认知的标准进行规范。
研究区域内部分区域被视为“无灾害或灾害可忽略区域（no or insignificant hazard zones）”，即经研究确认无灾害发生风险的区域。此类区域不属于本数据集类别，无需作为灾害区域进行标注。但针对天然RPP场景，监管区划可能将部分未受灾害影响的区域划定为规定区域（详见PPR类别的定义）。