Simple download service (Atom) of the dataset: Hillsides of the Highest Known Waters (isocotes) in Haute-Garonne

Altitude at the level of the highest known waters (PHEC). Altitude that the water would reach for an exceptional flood i.e. usually for a centennial flood.
These ratings have been determined:
— during the development of Natural Risk Prevention Plans (NRPPs)
— by studies outside the PPR: Informative Map of Inundatable Areas (CIZI) and subsequent studies
This layer does not cover Toulouse because this PPRI does not have PHEC ratings but lockers. They're polygons. The registers of the Toulouse PPRI are attached to this file, in the file CASIERS_PHEC_PPRI_TOULOUSE_2011.zip

已知最高水位高程（PHEC），即极端洪水（通常为百年一遇洪水）时水位将达到的高程。

该类高程阈值的确定依据如下：
—— 在自然风险防治计划（NRPPs）编制过程中完成测定；
—— 由防洪风险规划（PPR）范畴外的研究确定，包括可淹没区域信息地图（CIZI）及后续相关研究。

本图层未覆盖图卢兹地区，因该地区的防洪风险规划（PPRI）未采用PHEC评级，而是使用了多边形登记项。该类登记项均为多边形要素。图卢兹PPRI的相关登记档案附于本数据集文件中，具体存放于CASIERS_PHEC_PPRI_TOULOUSE_2011.zip压缩包内。