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Adaptative management of hydraulic structures on the Sèvre nantaise and Thouet rivers

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The Sèvre nantaise and the Thouet are tributaries of the River Loire. The Sèvre nantaise flows over 159 kilometres and drains a catchment area of 2,356 km². The Thouet is 159 kilometres long and drains a catchment area of 3,452 km². Both catchments are situated in 2 Regions, pays de la Loire and Poitou charentes in the west of France. Development of a multicriteria tool and approach to develop intervention programmes for river restoration. 300 sites have undergone the participative multicriteria analysis. 3 programmes of opening of gates and lowering of structures have already been conducted.

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Removal of the Maisons-Rouges dam over the river Vienne

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The solution was implemented on the river Vienne, an tributary of River Loire. The dam was situated after the confluence of the river with the Creuse, another major tributary. These  sub-basins historically attracted salmon, shad, sea lamprey and eels. Removal of a dam (built in 1920) in the context of a long term management plan of the river Loire, to improve the continuity and to enhance fish migration potential.

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