Plan to prevent the natural risks of landslides — Municipality of Mirabel — Zone d’aléas — Department of Tarn-et-Garonne.

Area exposed to one or more hazards represented on the hazard map used for risk analysis of the RPP.
The hazard map is the result of the study of hazards, the objective of which is to assess the intensity of each hazard at any point in the study area. The evaluation method is

specific to each type of hazard. 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. Award

from a hazard level to 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 map by a code for each hazard to which it is exposed.

All hazard areas shown on the hazard map are included. Areas protected by protective structures must be represented (possibly

specific) because they are always considered to be subject to hazard (case of breakage or inadequacy of the work).
Hazard zones may be described as data compiled to the extent that they result from a synthesis using multiple calculated hazard data sources,

modelled or observed. 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 in a prescribing zone (see definition of Class PPR).

本对象对应用于RPP风险分析的危险图（hazard map）上标注的、受一种或多种危险影响的区域。
危险图是危险研究的成果，其研究目标为评估研究区域内任意点位的各类危险强度。评估方法因危险类型而异，最终会在研究范围内划定若干区域，形成按危险等级分级的分区体系。将危险等级赋予研究区域内给定点位的过程，需综合考虑危险现象的发生概率及其强度等级。
对于多随机PPR（PPRNs），危险图上的每个分区通常会通过其暴露的各类危险对应的专属编码进行标识。
危险图上标注的所有危险区域均纳入本对象范畴。受防护结构保护的区域也必须予以标注（可采用专属标识），因为即便设有防护结构，此类区域仍可能面临危险（例如防护设施破损或性能不达标的情形）。
危险分区可被视为经整合后的数据集，其整合依据为多源计算得到的危险数据、建模结果或观测数据。本对象类不涉及这些源数据，相关内容由另一项针对危险认知的标准予以规范。
研究区域内的部分区域被视为“无危险或可忽略危险区域”，即经研究确认危险程度为零的区域。此类区域不纳入本对象范畴，也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归为规定分区（详见PPR类别的定义）。