Regulated area of the PPR flooding of Couze Chambon (63DDT19990006) approved on 22/12/2008 — Puy-de-Dôme

The territory covered by the P.P.R.I. is divided into orange and red zones. In all these areas, the existence of the hazard requires certain land use to be prohibited, but allows some work to be carried out. The orange zones They group the territories for which their urbanised character and the existence of a medium or low hazard allows urbanisation provided that vulnerability is not aggravated*. There are two orange zones: — zone O1, corresponding to the low hazard area, — zone O2, corresponding to medium hazard areas. In these areas: * new buildings whose characteristics take into account the risk may be allowed but under more restrictive conditions in zone O2 compared to zone O1; * the evolution of the existing building will aim to improve the current situation: people’s safety and demand for no increase in the economic cost of damage, The red zones They include the territories for which the main objective is: * for urbanised sectors, not to aggravate vulnerability, * for non-urbanised or weakly urbanised areas, to preserve flood expansion fields and flow conditions. There are three red areas: R1, R2 and R3 (with R3u sector corresponding to urban centres subject to a strong hazard). In these areas: * new constructions, installations and structures are in principle prohibited, except for exceptions1. * For the existing building, any development will aim to improve the current situation in terms of people’s safety* and no increase in the economic cost of damage. * In the R1 and R2 flood expansion zone, the increase in reception capacity is limited, with more restrictive conditions in the R2 zone. * In urbanised R3 areas, the objective is not to exacerbate vulnerability by avoiding increasing the number of people directly or indirectly exposed and in the R3u sector by avoiding increasing the number of people directly exposed.P.P.R.I.覆盖的全域被划分为橙色区与红色区两类。在上述两类区域中，因存在灾害风险，部分土地使用行为被禁止，但允许开展部分作业活动。 橙色区域 此类区域兼具城市化特征，且灾害风险等级为中等或偏低，在不加剧脆弱性的前提下，可开展城市化建设活动。橙色区域分为两类： — O1区：对应低灾害风险区域； — O2区：对应中等灾害风险区域。 该类区域内的相关规定如下： * 符合风险防控要求的新建建筑可获许可，但O2区的限制条件严于O1区； * 既有建筑的改造升级应致力于改善当前现状，保障人员安全，且不得提升灾害造成的经济损失成本。 红色区域 此类区域的核心目标分为两类： * 对于已城市化区域，需避免加剧脆弱性； * 对于未城市化或低城市化区域，需保护洪水行洪区与径流条件。 红色区域分为三类：R1区、R2区与R3区（其中R3u分区对应受强灾害风险影响的城市中心区域）。 该类区域内的相关规定如下： * 原则上禁止新建建筑、设施及构筑物，例外情形1除外； * 对于既有建筑，任何改造升级均应致力于改善当前人员安全状况，且不得提升灾害造成的经济损失成本； * 在R1与R2洪水行洪区内，行洪容纳能力的提升受到限制，且R2区的限制条件更为严格； * 在已城市化的R3区域中，目标是避免直接或间接暴露于灾害风险的人员数量增加，以防止脆弱性加剧；而在R3u分区中，则需避免直接暴露于灾害风险的人员数量增长。