Dataset Direct Download Service (WFS): PPRN hazard zone flooding by overflow of the Charente River of the municipality of Geay 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、受一种或多种危险影响的区域。危险地图是危险研究的成果，此类研究的目标为评估研究区域内任意点位处各类危险的强度。每种危险类型对应专属的评估方法，据此可在研究范围内划定若干区域，形成按危险等级分级的分区。对境内某一给定点位进行危险等级赋值时，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，危险地图上通常会通过代码标识每个区域所暴露的各类危险。
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（可采用特定方式），因为即便设有防护结构，此类区域仍面临危险风险（例如结构失效或防护不足的情形）。
危险区域可被视为拓展数据集，其来源于对多源计算、建模或观测得到的危险数据的综合整合。此类源数据不属于本对象类的范畴，而是由另一项针对危险认知的标准所规范。
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。此类区域不属于本对象类的范畴，无需作为危险区域进行标注。不过，对于天然RPP，监管分区可能将未受危险影响的区域归类为规定区域（详见PPR类的定义）。