Relief wells (also known as pressure relief wells or bleed wells) are used to reducing pore water pressures in confined aquifers or in stratified ground conditions. The relief wells are typically drilled before the excavation has extended below the piezometric level in the aquifer. As excavation continues, the wells will begin to overflow, relieving pore water pressures in the aquifer and ensuring stability. The water flowing from the relief wells is typically disposed of by sump pumping. A granular drainage blanket and network of drains can be used to direct water to the sumps and prevent ponding in the excavation.
Groundwater Engineering provides complete relief well dewatering solutions:
- Design of dewatering systems
- Well drilling and installation
- Pumping tests
- Equipment sales and rental
- Monitoring systems
- On-site operation and maintenance