Perimeters of the Natural Risk Prevention Plan (PPRN) Inondation of the Cérou Basin — Tarn

This dataset contains the boundaries at the different stages of the development of the PPRN. The characteristic of these perimeters is to be the consequence of an official act and to produce their effects from a specified date. This is the following: — prescribed scope contained in the prescription order of a PPR (natural or technological); — scope of risk exposure that corresponds to the scope regulated by the approved RPP. This approved perimeter is a utility easement (PM1 for PPRNs and PM3 for PPRTs); — scope of study which corresponds to the envelope in which the hazards were studied.本数据集包含PPRN在不同开发阶段的各类边界。此类边界的核心特征为：均由官方文书确立，且自指定日期起生效。具体涵盖以下三类范围： — 自然类或技术类PPR的规程指令中所载的规定范围； — 与经核准的RPP所规制范围相对应的风险暴露范围，该经核准的边界为公用役地（PPRN对应PM1，PPRT对应PM3）； — 研究范围，即针对风险隐患开展研究的覆盖范围。