Restoration of the Black Marsh of Saint-Coulban

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Site name: 
Black Marsh
Since 1984, the Hunting Federation of Ille-et-Vilaine Department has been rehabilitating a 550-hectare marshland that was heavily developed in the last century. Rehabilitation began with the replacement of corn crops by hay and pasture natural meadows via contractual agreement (with finacing) with the farmers. It continued with the restoration of a peat bog and a reed bed. In addition, due to the highly developed nature of the marsh and its drainage by a highly recalibrated and deepen watercourse, artificial water level management was also put in place to allow winter flooding. The project's objective is to improve the marsh to allow migratory waterbirds halting and to improve some of the marsh functionalities (carbon sequestration by peat and natural water purification). They have been achieved with regard to bird halting, but water level management is not currently optimised and will be reviewed to improve the hydrological functioning of the marsh.
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Location description: 
Included in the vast Dol marshes (10,500 ha), the Châteauneuf marsh is a regularly flooded depression made up of peaty alluvium and juxtaposing the Mont-Saint-Michel bay. Until 1950, it included one residual lake (the Mare de St-Coulban), before it was dried out. The marsh has since been drained by the Meleuc river, which shows a strong recalibration. Before the project, the marsh was subject to an intensive agricultural use, mainly for corn. It included a former peat bog that had been mined and drained.
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RBD code: 
FRG-La Loire, les cours d'eau côtiers vendéens et bretons
Last updated: 27 Apr 2020 | Top