This type of installation is recommended for narrow, gently sloping streams. The flexible cofferdams are installed by placing the hinges “back to back”.
Remove river mud/vase
It is imperative to clean the bottom of the river, where the cofferdams will be placed, otherwise there is a risk that their stability will be compromised when filling (hydrostatic pressure). If the frictional forces between the backdrop and the ground are insufficient, the dam may begin to slip.