Regulatory zoning of the department of Aveyron (PPRN)

Plans for the prevention of natural hazards (PPRN) were established by the Act of 2 February 1995 on strengthening the protection of the environment. They are the key instrument of the State in the field of risk prevention. The objective of this procedure is to monitor development in areas exposed to a major risk.
The PPRNs are decided by the prefects and usually carried out by the departmental directorates of the territories (DDT). These plans regulate land use or land use through construction prohibitions or requirements on existing or future buildings (constructive provisions, vulnerability reduction work, restrictions on agricultural use or practices, etc.).
These plans may be under development (prescribed), implemented in advance or approved.
For natural PPRs, the Environmental Code defines two categories of zones (L562-1): risk-exposed areas and areas that are not directly exposed to risks but where measures can be foreseen to avoid exacerbating the risk.
Depending on the hazard level, each area is subject to an enforceable settlement.
The regulations generally distinguish three types of zones:
• ‘Building prohibited areas’, known as ‘red areas’, where the hazard level is high and the general rule is the prohibition on construction;
• ‘prescribed areas’, known as ‘blue zones’, where the hazard level is average and the projects are subject to requirements adapted to the type of issue;
• areas not directly exposed to risks but in which constructions, works, developments or holdings of agricultural, forestry, crafts, commercial or industrial holdings could aggravate risks or cause them again, subject to prohibitions or requirements (cf. Article L562-1 of the Environmental Code)

自然灾害防治计划（PPRN）由1995年2月2日颁布的《加强环境保护法》确立，是国家在风险防治领域的核心工具。本规程的目标是对存在重大风险区域的开发活动进行监测。
该计划由省长审批，通常由省领土事务总局（DDT）负责落地执行。此类计划通过对现有及未来建筑制定施工禁令或相关要求（包括建设规范、降低易损性工程、农业使用限制或作业规范等），规范土地使用行为。
此类计划可处于编制（核定）、预实施或获批状态。
针对自然灾害防治的PPRN，《环境法典》将其管控区域划分为两类（L562-1条款）：直接受风险影响区域，以及虽未直接面临风险但可通过预先制定措施避免风险加剧的区域。
根据灾害等级的不同，各区域需执行对应的强制管控要求。
相关法规通常将区域划分为三类：
• 禁止建设区（又称“红色区域”）：该区域灾害等级较高，通用规则为禁止任何建设活动；
• 管控建设区（又称“蓝色区域”）：该区域灾害等级为中等，建设项目需遵循适配问题类型的相关要求；
• 非直接受风险影响区域：该区域虽未直接面临风险，但各类建设、工程、开发活动以及农业、林业、手工业、商业或工业经营活动可能加剧风险或引发风险复发，需遵循相关禁令或要求（详见《环境法典》L562-1条款）