Map Viewing Service (WMS) of the dataset: PPRi Châlons-en-Champagne Regulatory Zoning Reference Profiles — CAC Sector

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.在水力模拟过程中，研究人员针对该区域确定了百年一遇洪水风险。除该风险的包络线外，还可获取整个区域的水位数据。为可视化展示这些水位高度，研究人员布设了一组被称为“参考剖面（reference profiles）”的测量剖面，其高程偏差约为20厘米。所有此类高程值均以法国国家高程基准（Nivellement Général de la France，NGF）为参照，单位为NGF米。 法定条例针对各区域区分了需高于或低于法定高程值的建设工程。法定条例将法定高程值定义为：针对居住或功能用房地面以及防水材料使用场景，需在参考高程值基础上提升5厘米；针对包括电气设施在内的易受水损设备，则需提升30厘米。需采用的参考高程值会标注在法定区划图上，且需在场地紧邻上游侧查找。 数据溯源：参考剖面标注于PPRi图形图件中，以带有NGF米高程值的多段线表示。此类高程值将用于确定解读IPP条例时所采用的法定高程值。所有参考剖面均布设于PPRi覆盖的全域范围内。