Project Description

# 1 | Installation ⊥ perpendicular

This is the fastest and most dramatic type of installation. The flexible cofferdams become pressurised instantly.

Water-Gate© is suitable for any kind of river bed: because of their incredible flexibility, our inflatable cofferdams snugly fit the banks and the bed of the waterway, whatever the terrain.

WaterGate guarantees an excellent seal thanks to the pressure exerted on the ground sheet by the water.

batardeaux rivière canalisation
Fixing a Water-Gate © flexible cofferdam against a wall with an open angle.
Flexible Water-Gate © cofferdams for work in rivers. Removable dam with bypass by pipeline.
Flexible Water-Gate © cofferdam serving as a retention basin with drainage of the overflow by pipeline.
Flexible Water-Gate © cofferdams. Drainage of the Caramy river in Brignoles.
Construction of an access track protected by a flexible Water-Gate © cofferdam
Drainage of the CARAMY river by flexible Water-Gate © dam. The Foresters Company
Diversion of the Seymaz river in Geneva with a flexible Water-Gate © cofferdam and a double-walled corrugated tube.
Cofferdam Water-Gate © WA-5050 | 127cm x 15.2m placed on a corrugated tube of diameter 800.

How to install the branch pipes?

  1. First of all, the diameter of the pipes must be correctly dimensioned, based on the observed average flow rate of the river at equivalent period.
  2. We recommend placing the pipes under the “Water-Gate ©” dam in order to optimize the useful section and the flow.
  3. The pipe should be wedged with sandbags or ideally clay to limit leakage at the base of the tube for 2 meters from the leading edge.
  4. Cover the clay with rockery to increase the friction forces before installing Water-Gate©.
Wedging of an ECOPAL pipe with clay, upstream side. End that will receive the leading edge of the Water-Gate © flexible cofferdam
Rocks are placed on the clay to increase the frictional forces and prevent the flexible cofferdam from slipping during pressurization.
The Water-Gate © flexible dam is unrolled directly into the river bed on the clay and stones placed on the bottom.

Removable overflow weir and flexible pipes for narrow river beds

In the case of low flow rates – less than 100l / s | 360m3 / h – It is possible to use the Water-Gate© DS-1200 overflow weir that is positioned directly on the ridge edge of the dam. The evacuation is carried out by flexible polyethylene pipes with a section of 450mm.
Flexible hoses are easy to install, with a reduced footprint and the ability to bypass obstacles.

This saves considerable time for the worksite preparation phase.

Flexible Water-Gate © cofferdam installed on an arm of a mountain river with the DS-1200 surface weir without its flexible pipe.