PPR perimeter of the rivers RHINS and Trambouze — Loire

Risk Prevention Plans (RPPs) are the key government instrument for risk prevention. Their objective is to control development in areas at risk. The development of a risk prevention plan generates a set of spatial data organised into several data sets. The same PPR may include spatial datasets containing: — main scopes of the RPP; — restricted areas of the plan once approved. RPP regulations generally distinguish between ‘construction ban areas’, so-called ‘red areas’, where the hazard level is high and where the general rule is the construction ban; ‘areas subject to requirements’, known as ‘blue zones’ where the hazard level is medium and projects are subject to requirements adapted to the type of issue and areas not directly exposed to risks but subject to prohibitions or prescriptions; — hazard areas represented on the map of hazards used for risk analysis by crossing with the stakes, specifying for each zone the level of the hazards to which it is exposed; — issues which are persons, property, activities and elements of cultural or environmental heritage threatened by a hazard and likely to be affected or damaged by it; — origins of risk, i.e. the entity of the real world which, through its presence, represents a potential risk. This entity may be characterised by a name, a reference to an external object or a geographical object that locates the actual entity causing the risk. Each element in the same PPRN dataset is bound by the GASPAR format identifier “ddd[PREF|DDT|DDT|DREAL]aaaannnn” (AAAA and NNNN correspond to the reference year and the order number of the PPR procedure associated in GASPAR) to a single object in the PPRN document table described by the N_DOCUMENT_PPRN metadata sheet.风险预防计划（Risk Prevention Plans, RPPs）是政府开展风险防控的核心工具，其核心目标为管控风险区域内的开发行为。 风险预防计划的编制会生成一系列空间数据，并被划分为多个数据集。同一RPP可涵盖包含以下内容的空间数据集： — 风险预防计划的核心范围； — 计划获批后的限制开发区。RPP的监管规范通常会区分两类区域：一是“禁建区”（又称“红色区域”），此类区域灾害等级较高，通用规则为禁止建设；二是“合规管控区”（又称“蓝色区域”），该区域灾害等级为中等，开发项目需根据问题类型落实适配性管控要求，另有部分未直接暴露于风险之中，但仍需遵守禁令或管控规定的区域也纳入此类范畴； — 用于风险分析的灾害地图所标注的灾害区域，此类地图通过将灾害图层与风险受体图层叠加绘制而成，并需为每个区域明确其所承受的灾害等级； — 风险受体：即受灾害威胁、可能因灾害发生而遭受影响或损毁的人员、财产、活动及文化或环境遗产元素； — 风险源：即现实世界中因自身存在而构成潜在风险的实体。该实体可通过名称、外部对象引用，或用于定位实际致险实体的地理对象进行标识与表征。 同一PPRN数据集（PPRN dataset）中的每个元素，均通过GASPAR格式标识符"ddd[PREF|DDT|DDT|DREAL]aaaannnn"（其中AAAA与NNNN分别对应GASPAR系统中关联的RPP流程的参考年份与序号），与由N_DOCUMENT_PPRN元数据表所描述的PPRN文档表中的单个对象绑定关联。