PPRI Loire downstream in the Nantes agglomeration: Rating of the reference flood not altimemetric of 5 cm, in Loire-Atlantique

The Flood Risk Prevention Plan (PPRI) of the Loire downstream in the north; Nantes agglomeration replaces the PSS (Plan des surfaces submersibles) of the Loire Valley delimited by decree of 6 November 1958. Its purpose is to regulate the use of land (rules of #x27; urban planning, construction and management) in the \#x27; envelope of flood zones modelled according to the scenario of ' a hundred-year flood (each year, one chance in a hundred for this type of flood to occur). The L_PPRI_LOIREAV_ISOC5CM_L_044.TAB layer presents the NGF-IGN69 level reached by the Loire for this reference centennial flood. The values are given by step of 5 cm on the section of the Loire between Nantes-St-Sébastien and Couëron-Le Pellerin. __Origin__ Isocotes represent the NGF levels reached by the Loire for the PPRi reference flood. These levels have been determined within the framework of a modelling taking into account in particular maritime phenomena (tidal, surcote, wind). __Partner organisations__ DDTM Loire-Atlantique __Links annexes__ * [XML metadata view](http://ogc.geo-ide.developpement-durable.gouv.fr/csw/all-dataset?REQUEST=GetRecordById&SERVICE=CSW&VERSION=2.0.2&RESULTTYPE=results&elementSetName=full&TYPENAMES=gmd:MD_Metadata&OUTPUTSCHEMA=http://www.isotc211.org/2005/gmd&ID=fr-120066022-jdd-c677ed00-e553-4f66-8c74-8995dcd28671) * [the services of l' State in Loire-Atlantique. The PPRI of the Loire downstream in the Nantes agglomeration](http://www.loire-atlantique.gouv.fr/Politiques-publiques/Risques-naturels-et-technologiques/Prevention-des-risques-naturels/Plans-Prevention-Risques-Naturels-Previsibles/Les-plans-de-Prevention-des-Risques-Inondation-en-Loire-Atlantique/Le-PPRI-de-la-Loire-aval-dans-l-agglomeration-nantaise) [See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/b7192ac712ced2d37c53c3dc1e089d051cb27a90)