Vienna Flood Risk Prevention Plan (PPRI) Regulated Area — Châtellerault Municipality in Vienna

For natural PPRs, the Environmental Code defines two categories of zones (L562-1): risk-exposed areas and areas that are not directly exposed to risks but where measures can be foreseen to avoid exacerbating the risk.

Depending on the hazard level, each area is subject to an enforceable settlement. The PPRI of Vienna in Châtellerault has two regulatory areas:
— red zone: high hazard urban areas as well as flood expansion zone,
— blue zone: urban centres located in low to medium hazard.

针对自然风险预防区域（natural PPRs），《环境法典》（L562-1条款）明确划定两类管控区域：风险暴露区域，以及虽未直接承受风险但可预先采取措施规避风险加剧的区域。
依据危险等级的不同，每类区域均需遵守可强制执行的管控要求。
沙泰勒罗维也纳片区的洪水风险预防规划（PPRI）设有两类管控区域：
— 红区：涵盖高危险城市区域与洪水漫溢区域；
— 蓝区：为处于低至中等危险等级的城市中心区域。