Conséquences de l'enfoncement du lit de l'Arve sur les berges et les ouvrages. Bilan général des transports solides sur le cours d'eau

In the first part, the phenomenon of the sinking of the torrent bed is analysed: its scale, it consequences on banks, bridges, walls and other works, and the solutions adopted in order to stop the process are reviewed. These problems are treated from the point of view of the supervising agency. The technical and financial difficulties usually encountered are described, as well as the means of action available. The second part of the paper is presented in the form of a statement of the quantities of materials entering and leaving the system of reference forming the torrent: flowed and extracted materials, sinking of the bed,trapping of deposits by Verbois reservoir. Contrary to an analytical process, this approach frees the authors from studying the complex mechanisms of Erosion, Transportation and Depositing and allows them to focus on their results.