Atlas of flood zones (AZI) — Vaucluse (84) — Lot sheet

The risk of flooding is the predominant natural risk in metropolitan France. Almost half of the municipalities are affected to varying degrees by flooding, as the share of communal areas in flooding areas varies. The risk of flooding is the subject of significant prevention efforts that need to be continued. Controlling urbanisation and reducing the vulnerability of populations in flood zones are among the objectives of the Grenelle of the Environment. Reducing the vulnerability of people in flood zones requires protective measures (e.g.: dikes) and prevention (example: flood risk prevention plans), by reducing the number of people exposed (example: control of urbanisation) and awareness of risk (e.g. preventive information). In some areas, not covered by RIPs, flood zone atlases (AZI) have been established. The AZI is a knowledge document that delimits the flood field of a watercourse on the basis of a so-called hydrogeomorphological method (a geographical approach that studies the natural functioning of a watercourse by analysing the structure of the alluvial plain). These atlases are information material with no direct regulatory scope. Nevertheless, as a flood risk knowledge tool, an AZI can support a refusal of building permits.洪涝风险是法国本土最主要的自然风险。近半数市镇均受到不同程度的洪涝影响，这是由于洪涝风险区内的市镇辖区占比存在差异。洪涝风险是亟需持续开展系统性防治工作的核心议题。管控城市化进程、降低洪涝风险区内人口的脆弱性，正是环境格勒纳尔会议（Grenelle of the Environment）的核心目标之一。降低洪涝风险区内民众的脆弱性，需通过减少受影响人口规模（如管控城市化进程）、提升风险认知水平（如开展预防性宣传），并落实防护措施（如堤防工程）与风险预防工作（如洪涝风险防治规划）来实现。在部分未纳入洪涝风险预防计划（RIPs）覆盖范围的区域，已编制完成洪涝风险区图集（AZI）。洪涝风险区图集（AZI）是一类基于所谓水文地貌学方法划定河道洪涝影响范围的专业资料文档——该方法属于地理学研究路径，通过分析冲积平原的结构来探究河道的自然运行规律。此类图集仅为参考资料，不具备直接的法律效力。尽管如此，作为洪涝风险认知工具，洪涝风险区图集（AZI）可作为否决建筑许可申请的依据之一。