Plan for the prevention of natural flood risks — Municipalities of the Garonne sector upstream — Revision n°2 Verdun-sur-Garonne — Document — Department of Tarn-et-Garonne

The Risk Prevention Plans (PPR) were established by the Act of 2 February 1995 on strengthening the protection of the environment. They are the key instrument of the State in the field of risk prevention. Their objective is to monitor development in areas exposed to a major risk.
The PPRs are approved by the prefects and generally carried out by the departmental directorates of the territories (DDT). These plans regulate land use or land use through building prohibitions or requirements on existing or future buildings (constructive provisions, vulnerability reduction work, restrictions on agricultural use or practices, etc.).
These plans may be under development (prescribed), implemented in advance or approved.
The RPP file contains a presentation note, a regulatory zoning plan and a regulation. Other graphic documents that are useful for understanding the approach (e.g. hazards, issues, etc.) can be attached. Each PPR is identified by a polygon that corresponds to the set of municipalities
the scope of the prescription when it is in the prescribed state; and the envelope of restricted areas when it is in the approved state.
This geographical table allows to map existing PPRNs on the department.
Each PPRN document in the N_DOCUMENT_PPRN geographical table is linked with its GASPAR code in the format “ddd[PREF|DDT|DDTM|DREAL]aaaannnn” (AAAA and NNNN correspond to the reference year and the order number of the associated PPR procedure in GASPAR):
1. its administrative procedure for drawing up (or revising) managed in the GASPAR application, on the one hand,
2. its set of numeric spatial data as described in the metadata sheet N_PPRN_AAAANNNN (#0001495).

风险预防计划（Risk Prevention Plans，PPR）由1995年2月2日《加强环境保护法案》确立，是国家在风险预防领域的核心治理工具，其核心目标为对重大风险暴露区域的开发活动开展动态监测。

风险预防计划由省长审批，通常由领土事务省总局（DDT）牵头落实。此类计划通过对现有或未来建筑设置禁令或准入要求（涵盖建设规范、脆弱性消减工程、农业使用限制或作业规范限制等），对土地利用行为进行规制。

此类计划可处于三类状态：编制中（已获批立项）、预实施或已正式获批。

PPR文件包含项目说明文档、管制分区图与管制条例。其他有助于理解该方案的辅助图形资料（如风险隐患、核心问题等）可作为附件附加。每份PPR通过一个多边形进行唯一标识：若计划处于编制阶段，该多边形对应适用该规制措施的全部市镇范围；若处于获批状态，则对应受限区域的边界包络范围。

本地理数据表可实现各省内已存在的PPRN（Risk Prevention Plans Revised，PPRN）的空间制图。

N_DOCUMENT_PPRN地理数据表中的每份PPRN文档，均与其GASPAR代码相关联，该代码格式为"ddd[PREF|DDT|DDTM|DREAL]aaaannnn"（其中AAAA与NNNN分别对应GASPAR系统中关联PPR流程的参考年份与流程序号），具体关联两类核心信息：
1. 其一为GASPAR系统中管理的PPR编制（或修订）行政流程；
2. 其二为元数据表N_PPRN_AAAANNNN（编号#0001495）中描述的全套数字空间数据集。