Enwave Chilled Water Distribution Network

  • Project comprises 3.5-m OD rock tunnels with twin 1,200-mm diameter cement-lined, steel chilled water supply and return pipes
  • Chilled water service connections are provided to downtown high-rise buildings through 5.2 km of tunnels, and 10.4 km of trunk chilled water lines under roadways
  • Considerations were made in locating the construction shafts to minimize disruption to vehicular and pedestrian traffic, minimize utility conflicts, and optimize construction costs
  • The project required careful selection of a tunnel boring machine as an appropriate construction technology to suit the ground conditions, as well as pre-selection of a qualified contractor, C & M McNally, during the design phase


  • project management
  • route selection
  • preliminary engineering
  • surveying
  • engineering design
  • contract administration