No. Sheet piling reduces groundwater inflow but isn’t completely watertight. Water can still pass through the interlocks and beneath the toe, particularly where the piles don’t reach a low-permeability layer. In sands, upward flow at the base can cause piping or boiling, and a confined aquifer under a clay layer can lift the excavation floor.
ACTION International Services designs sheet piling and dewatering together, so pile toe depth and drawdown are set as one system.
