# 3 | Block a branch of river / intake canal

Drying up of an arm of the river on the Doubs. 2 Flexible Water-Gate © WA-6050 and WA-6030 cofferdams linked together.
Flexible Water-Gate © cofferdam. River site. Renovation of the bridge over the Doubs. Dole
Drying up of the supply canal of the old Le Mans hydraulic plant. Huisnes river. View of the drained area downstream of the screen.
Drying up of an arm of the river on the Doubs. The flexible cofferdam is positioned on the left bank in the extension of the threshold of Dole.
Drying up of the supply canal of the old Le Mans hydraulic plant. Huisnes river.
Deviation of a river arm by flexible Water-Gate © cofferdam | Repair of the winnowing of the Bruche in Mutzig
Flexible Water-Gate © cofferdam. River site. Renovation of the bridge over the Doubs. Dole
Deviation of a river by flexible Water-Gate © cofferdam. "La Retourne" in Bergnicourt.

The principle: block the main arm or the secondary arm of a river

It is a perpendicular type installation (case # 1), simplified (cofferdam positioned perpendicular to the banks, without pipeline).
The upstream flow goes through the arm of the river which remains free.

It is essential to remove the silt from the installation area.

If the water level is important, try to find a location on the arm of the river where the depth is the lowest.

If the speed of the current is high, it is recommended to restrict the flow in the arm of the river as much as possible to ease the installation (winnowing, wooden planks, big-bags).

batardeaux rivière canalisation