PPRi Châlons-en-Champagne Regulatory Zoning Reference Profiles — Aval Sector of the CAC

During hydraulic modelling, the centennial flood hazard was determined on the area. In addition to the envelope of this hazard, the water levels over the entire sector could be determined. In order to visualise these water heights, a set of profile, known as “reference profiles”, was positioned with an altimeter deviation of about 20 cm. All of these ratings are linked to the General Level of France and are expressed in NGF meter. The by-law distinguishes for each area the construction projects to be above or below the regulatory rating. The regulatory rating is defined in the regulations as the reference rating increased by 5 cm for habitable or functional floor surfaces as well as for the use of water-resistant materials, and 30 cm for vulnerable equipment, including electrical installations. The reference rating to be used is indicated on the regulatory zoning maps, it must be searched immediately upstream of the site. Genealogy: The reference profiles are represented on the PPRi graphic documents. They are represented by polylines with a rating in NGF meter. These ratings will determine the regulatory ratings used in the interpretation of the IPP Regulations. The profiles are located throughout the PPRi sector.在水力建模过程中，本区域已确定百年一遇洪水危险性。除该风险的包络范围外，还可获取整个研究区段的水位数据。 为可视化这些水位高度，研究人员布设了一组被命名为「参考剖面（reference profiles）」的测线，其高程测量偏差约为20厘米。所有上述高程值均关联法国国家高程基准（NGF），单位为NGF米。 本地区地方法规针对各区域明确了建设项目需高于或低于法定管控高程值的要求。法规中规定：法定管控高程值为参考高程值上浮5厘米，适用于居住或功能性楼面以及防水材料的使用场景；而易受淹设备（含电气装置）对应的法定管控高程值则为参考高程值上浮30厘米。所需采用的参考高程值会标注于法定区划图上，需从场址紧邻上游侧处获取该值。 溯源说明：参考剖面标注于PPRi（法国防洪风险预防区划）图形文档中，以带有NGF米高程值的多段线形式呈现。上述高程值将用于确定解读IPP法规时所需采用的法定管控高程值。所有参考剖面均覆盖整个PPRi管控区段。