Dewatering is the process of controlling groundwater by pumping to locally lower levels in the area of the excavation. The simplest type of dewatering is sump pumping, this is where groundwater is allowed to enter the excavation site where it is then collected in a sump and pumped away. This process is effective to eliminate risk of construction problems.
Other types of specialized dewatering techniques that can also be used are:
- Relief Walls
- Artificial Recharge
- Siphon Drains
Choosing the proper method of dewatering will depend on multiple factors, including country, weather, type of ground, and type of excavation.