FORMATION ZONE

HYDROFOIL / STEPFOIL BOX

This type of drainage elements must:

• produce sufficient level of turbulence by mean of number, position and profile of the foils; the scope is to avoid the fibre flocculation which prevents a good formation of the sheet

• remove water in a controlled and progressive way ( depending on the number, position and profile of the foils) without sealing the sheet and avoiding the collapse of the retention