Dataset Direct Download Service (WFS): Limit of the perimeter of the PPRN of the catchment area of the Seine-Boucle de Rouen valley — Seine-Maritime department

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

针对自然风险预防区域（Natural PPRs），《环境法典》（Environmental Code）第L562-1条将其划分为两类区域：风险暴露区域，以及虽未直接暴露于风险但可通过预先采取措施避免加剧风险的区域。

依据危险等级的不同，每类区域均需遵循可强制执行的管控规则。相关管控条例通常将区域划分为三类：
1. 禁止建设区域（俗称“红色区域”）：该区域危险等级较高，通用规则为禁止一切建设活动；
2. 特定管控区域（俗称“蓝色区域”）：该区域危险等级为中等，建设项目需符合针对该类风险问题制定的适配性要求；
3. 非直接暴露于风险的区域：该区域内的建设工程、开发活动或农林牧渔、手工业、商业、工业经营活动可能加剧既有风险或引发新的风险，因此需遵守相关禁止性规定或管控要求（详见《环境法典》第L562-1条）。

上述第三类区域仅适用于自然风险预防区域（RPPs）。