PPRN — Regulated area of the PSS of the municipality of ROVILLE-DEVANT-BAYON (54465)

Submersible Surface Planes (PSS) are the first mapping documents regulating land cover in flooding areas for federal watercourses. They were created by the Decree-Law of 30 October 1935 and its implementing decree of 20 October 1937. The Barnier Law of 2 February 1995 gives PSS a risk prevention plan (PPR) status, making them enforceable against third parties. The PSS is a document that establishes a utility easement affecting land use. It allows the administration to oppose any action or work likely to impede the free flow of water or the conservation of flood fields (Article R425-21 of the Urban Code). The filing of a declaration before carrying out works likely to affect the natural flow of water (digues, embankments, depots, fences, plantations, constructions) is therefore necessary. Although having the same legal value, PSS and PPR are technically different. SSPs “merely” map a flood hazard in contrast to PPRs that represent a risk taking into account the vulnerability of the territories (regulatory zoning plan). Finally, the PSS mapped a so-called “average” flood less than the reference flood used as the basis for the development of PPRs (the highest known flood corresponding to the highest known waters (PHEC) and, in the event that it was lower than a centennial flood, the latter). Pursuant to Article L562-6 of the Code de l’Environnement, the PSS are to be PPR pending their repeal by a PPR on the municipalities concerned. 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.淹没地表平面图（Submersible Surface Planes，PSS）是首部针对联邦水道洪泛区土地覆盖进行规范的测绘文件，由1935年10月30日的法令及1937年10月20日的实施细则制定颁布。 1995年2月2日颁布的巴尼耶法（Barnier Law）赋予PSS风险预防计划（Risk Prevention Plan，PPR）的法律地位，使其具备对第三方的强制执行力。PSS是一份设立土地利用地役权的文件，授权行政主管部门反对任何可能阻碍水体自由流通或破坏滞洪区的行为与工程（详见《城市规划法典》第R425-21条）。因此，在开展可能影响水体自然流通的工程（包括堤坝、路堤、堆场、围栏、种植设施、各类建筑）前，必须先行提交申报。 尽管PSS与PPR具备同等法律效力，但二者在技术层面存在差异。PPR是综合考虑区域脆弱性制定的风险管控分区规划，而PSS仅用于绘制洪水风险分布图。此外，PSS所划定的“平均”洪水水位，低于作为PPR制定依据的参考洪水水位——该参考洪水为最高已知洪水（对应最高已知水位，简称PHEC）；若该最高已知洪水水位低于百年一遇洪水水位，则以百年一遇洪水作为参考标准。 根据《环境法典》（Code de l’Environnement）第L562-6条规定，在相关市镇通过PPR取代PSS之前，PSS将暂以PPR的形式生效。 针对天然PPR，《环境法典》第L562-1条将管控区划分为两类：一是风险暴露区，二是非直接暴露于风险但需采取措施防止风险加剧的区域。 根据风险等级的不同，各区域需执行对应的强制性管控要求。现行法规通常将管控区划分为三类： 1. “禁建区”（又称“红色区域”）：该区域风险等级较高，原则上禁止任何建设行为； 2. “管制区”（又称“蓝色区域”）：该区域风险等级为中等，所有工程建设项目需根据问题类型适配相应管控要求； 3. 非直接暴露于风险区域：该区域内的各类建设、工程、开发活动或农林牧副渔、工商产业项目可能加剧既有风险或引发新风险，需遵守相关禁令或管控要求（详见《环境法典》第L562-1条）。此类管控区划仅适用于天然PPR。