Functional restoration of the valley of Saint Ruph-Glière-Eau Morte

National Id: 
Due to major developments over the past two centuries, the Eau Morte Valley (a tributary of Annecy Lake) has a hydrosedimentary dysfunction with incised areas and areas with sediment excesses and an alluvial marsh disconnected from flooding. To reduce the impacts of the river's floods on uses, and to prevent the risk of urban areas flooding, a functional restoration programme for the valley has been developed by the federation of municipalities of Annecy lake sources. It was based on the renaturation of the Eau Morte bed, the functional restoration of the Giez marsh and the construction of crossing structures. This work has given the marsh a role as a flood expansion area. This project was also carried out by involving local residents in a process of territorial dialogue so that they themselves would be actors in the area and would participate in its management.
The in-depth description of the case study: 
Location description: 
The Eau Morte is the main tributary of the Annecy lake. Like its tributaries, the St Ruph and the Glière, it has its sources in the Bauges and Bornes mountains. The Giez marsh is located downstream of the valley, and the Eau Morte flows through it before flowing into Annecy Lake. The headwaters of the Eau Morte Basin are very productive in terms of sedimentary materials, due in particular to the presence of suspended moraines. Its valley is an alluvial plain resulting from the progressive filling of an ancient lake by the progressive addition of sediments.
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RBD code: 
FRD-Le Rhône et les cours d'eau côtiers méditerranéens
Last updated: 29 Apr 2020 | Top