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Attraction in the Vendee.
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the Barrage de Boisse near Fontenay le Comte.
BOISSE DAM
Le BARRAGE DE BOISSE
On the inlet of the Boisse a dam has been built across an old river inlet. As with al such structures on the marshes it is for water management.
The One at Boisse was built in 1840 to render the River Vendee navigatable fron Pont Neuf in Fontenay le Comte to the mouth of the Longeve.

Dams built on transverse channels through out the marshes are usefull in controlling the water flow towards the Bund (embankment, dam or levee) of the discharge channel.
Others are built upstream of the tidal gates with the aim of retaining a sufficient body for release. The force thus produced serves to scour any mud downstream and as far out to sea as possible.
barrage on a canal.
More information on the Marais Poitevin