In many European countries with a temperate climate like Belgium, the large-scale infrastructure projects with deep foundations or long trajectories often require prolonged dewatering periods to manage groundwater levels during construction works. Dewatering involves the removal of groundwater to create dry and stable conditions for excavation and building. While some of these projects contribute to climate goals, it also necessitates a thorough evaluation of its environmental impacts, particularly concerning salinity distribution and the adverse impact on biodiversity. Therefore, the implementation of targeted mitigation strategies is essential to ensure that the project’s benefits are realized in an environmentally responsible manner. Managing saltwater displacement during dewatering operations in the coastal aquifers is crucial due to the potential environmental risks involved. To manage and mitigate salinity issues, the following strategies have been applied: first, implementing controlled extraction practices, where the excavation is subdivided into dewatering phases to prevent overexploitation and maintain natural balance between freshwater and saline water as possible. Second, applying artificial recharge near the dewatering location by re-introducing the pumped groundwater back into aquifers through infiltration basins, ditches or injection wells to reduce the zone of influence and maintain a sustainable level. Monitoring and modeling are implemented during the dewatering operation by utilizing advanced tools and models to monitor the zone of influence, salinity distribution and predict future changes, aiding in proactive management decisions. In the context of dewatering operations, SEAWAT can be employed to predict how groundwater extraction might influence the movement of saline water and contaminants. By modeling different dewatering scenarios, it is possible to identify strategies that minimize the risk of contaminant displacement and salinity intrusion. For instance, adjusting pumping rates, configuring extraction wells or introducing hydraulic barrier based on the model simulations can help control the direction and extent of groundwater flow, thereby mitigating potential adverse effects not only by mitigating the risks associated with salinity changes and contaminant displacement but also to control the impact on the fauna and flora and avoid the risks of prolonged drought.