AZI Coastal water courses — Secondary geomorphological elements of the alluvial plain — in Loire-Atlantique

These data represent the secondary geomorphological elements of the alluvial plain (01: marshes, 03: sandy coastal cord, 04: inter-dual depression). The study perimeter of the flood zones (AZI) of coastal rivers covers the watersheds of the Etier du Pont d’Arm, du Boivre, the Canal de Haute Perche and Falleron (including its upstream part located in the Vendée department). __Origin__ L' study led by the DDEA of Loire-Atlantique applies to the overall linear of the 4 courses d' coastal water the hydrogeomorphological method for determining floodable areas. This naturalistic approach based on the analysis of the forms and formations of valley bottoms makes it possible to do so; identify the different beds of the river. It is complemented by research d' archive on historical floods. L' analysis is based on the geomorphological interpretation of #x27; stereoscopic cover of aerial photos validated by field checks. The hydrogeomorphological study consists of maps of inundability carried out at the scales of the 1/25.000e on a background formed by SCAN 25 of l'I.G.N. and 1/10 000e for areas at stake on the #x27th; orthophotoplan. __Partner organisations__ DDTM Loire-Atlantique __Links annexes__ * [Atlas-des-zones-inundables-des-cours-d-eau-cotiers](http://www.loire-atlantique.equipement-agriculture.gouv.fr/Politiques-publiques/Risques-naturels-et-technologiques/Prevention-des-risques-naturels/Atlas-des-zones-inondables/Atlas-des-zones-inondables-des-cours-d-eau-cotiers) [See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/dccd6025205a0bd9e798c3958cac7bf82739d2f7)