FNIPP millennial hazard zone of the mancelle agglomeration

The PGRI Loire-Bretagne asked the PPRI to map, a flood of millennial occurrence. This is an informative mapping, but the regulation refers to it when a project is linked to a sensitive establishment. The submersion height criterion is the only criterion that characterises the hazard. The isocotes of this hazard mapping make it possible to estimate at any point the altitude reached by this flood.PGRI卢瓦尔河-布列塔尼（PGRI Loire-Bretagne）委托PPRI开展千年一遇洪水的风险制图工作。该制图成果属于科普性风险区划，当项目涉及敏感设施时，相关监管规定会援引该成果。淹没高度标准是表征该洪水灾害风险的唯一判定依据。该洪水风险区划图的淹没等高线（isocotes）可用于估算任意位置处该次洪水的淹没海拔高度。