Wellpoint System Installation

Wellpoint systems are limited by suction lift and can only lower water below grade to a certain point (depending on the altitude). Systems are often installed as a Single-Stage or Multi-Stage because of these limitations:
 

Single-Stage

When excavations are 18ft deep or shallower, one row of wellpoints may be used to draw the groundwater below subgrade. Careful consideration should be given to the project altitude as higher altitudes will mean less available drawdown.
 

Multi-Stage

Wellpoints can be used on much deeper excavations, but multiple stages are required. If necessary, two or more rows of wellpoints are installed at different elevations. This is needed when the excavation is deeper than 18ft or when the altitude would prevent dewatering with a single wellpoint stage.