Chemin Navigable de France is responsible for conducting pre-operational studies (geotechnical, topographic, bathymetric and hydraulic) that allow the acquisition of data necessary for the subsequent design of the facilities that will provide a lasting response to the morphological dysfunctions of the Loire bed between the Ponts-de-Cé (49) and Nantes (44). This operation is presented under Action 13 of the ERDF Loire OIP. This amendment concerns a request for an extension and modification of the period of execution of the operation, which is now from 01/07/2015 to 01/07/2019.