Map Viewing Service (WMS) of the dataset: Regulated area of the PPRN flooding by overflow of the Charente River of the commune of Port-d’Envaux en Charente-Maritime.

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.针对自然风险预防规划（PPR），《环境法典》第L562-1条款将其覆盖的区域划分为两类：受风险直接影响区域，以及未直接暴露于风险但可采取相关预防措施以避免风险加剧的区域。 根据危险等级的不同，每类区域均需遵循强制性管控要求。相关法规通常将区域划分为以下三类： 1. 建筑禁止区（又称"红色区域"）：该区域危险等级较高，通用规则为禁止任何建设活动； 2. 特定管控区（又称"蓝色区域"）：该区域危险等级为中等，相关建设项目需遵守适配于风险类型的管控要求； 3. 非直接风险暴露区域：若在此区域内开展建设工程、开发活动或农业、林业、手工业、商业及工业类经营活动，可能加剧既有风险或引发新的风险，此类区域需遵守相应的禁止性规定或管控要求（参见《环境法典》第L562-1条款）。此类区域仅适用于自然RPP。