Plan for the prevention of natural risks of terrain movement — Municipality of Tréjouls — Regulatory area — Department of Tarn-et-Garonne

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:
1- ‘Building prohibited areas’, known as ‘red areas’, where the hazard level is high and the general rule is the prohibition on construction;
2- ‘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;
3- areas not directly exposed to risks but where constructions, works, developments or farms, agricultural, forestry, craft, commercial or industrial could aggravate risks or cause new ones, subject to prohibitions or requirements (cf. Article L562-1 of the Environmental Code). The latter category applies only to natural RPPs.

针对自然PPR区域（natural PPRs），《环境法典》（Environmental Code）在L562-1条款中划定了两类区域：风险暴露区域，以及虽未直接暴露于风险但可采取相关措施规避风险加剧的区域。
依据危险等级差异，每类区域均需遵循具备强制执行力的建设管控规则。该法规通常将区域划分为三种类型：
1. 禁止建设区（又称"红色区域"）：该区域危险等级较高，通用规则为禁止一切建设行为；
2. 指定管控区（又称"蓝色区域"）：该区域危险等级中等，相关建设项目需适配风险类型制定对应管控要求；
3. 虽未直接暴露于风险，但建设工程、工程作业、开发项目或农场、农业、林业、手工业、商业及工业经营活动可能加剧既有风险或引发新风险的区域，需遵守相应禁止性规定或管控要求（详见《环境法典》L562-1条款）。该类区域仅适用于natural RPPs。