ABSTRACT
High-rise and other types of specialty buildings typically are built with deep excavations for several reasons, including reaching good foundation materials. The excavated space is commonly used to create parking garages or other functional spaces. To achieve the deep excavation work, it is common for considerable dewatering effort to be required to lower the water table. When the dewatering efforts end, the water table will rise to its prior level which often is well above the bottom of the building foundation. Since water intrusion is detrimental to the use of the building spaces, an effort must be made to prevent water from penetrating into the building. This waterproof membrane must remain intact for the useful life of the structure.
