If you ask a construction specialist, he will tell you that dewatering is the process of removal of groundwater at a certain depth to facilitate the construction of foundations.

Sheet piling, the method of reinforcement is a form of earth retention done in construction sites for improving stability.  It is an excavation support that retains soil by inserting steel/concrete sections with interlocking edges. These sheet piles act as a wall and behave as a barrier to reduce the inflow of groundwater. They are also used commonly in coastal defense.