Construction Dewatering: Understanding its effect on below-grade waterproofing
Construction site dewatering is used to locally control and lower groundwater levels in the vicinity of the excavation. This is typically done to maintain soil conditions needed during, and occasionally after, construction – for example, to keep soil dry enough for construction loads, installing building materials, or safe working conditions. Dewatering requirements for structural needs differ from those for below-grade waterproofing of the building. This article defines and describes ‘site dewatering’ during construction from the perspective of below-grade waterproofing design and installation, and highlights the differences in dewatering requirements between structural and waterproofing needs.