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Friday, 25 September, 2015

Seymour-Capilano Water Tunnels


Summary

In order to treat water from both the Seymour and Capilano Reservoirs in Vancouver, British Columbia, Canda at the new Seymour-Capilano Filtration Plant, water is conveyed through underground tunnels. These tunnels are 7.1 kilometers long and 160-640 meters below ground level. When the tunnels were commissioned in 2014, raw water from the Capilano source was pumped through one of the tunnels to the filtration plant for treatment, and the treated water was returned to Capilano through the parallel tunnel for distribution.  These tunnels are designed to transfer 1,100 million liters of water each day.  Water from the Capilano source gets treated and disinfected at the filtration plant and returns to Capilano through a parallel tunnel. The water is then distributed to residents throughout Metro Vancouver, British Columbia.  At the Seymour end of the twin tunnels, a 185 meter-deep, 11 meter-diameter shaft was excavated to link the tunnels to the surface.  As the Seymour-Capilano Filtration Plant is higher in elevation than the Capilano Reservoir, excess pressure is generated when treated water is returned through the treated water tunnel. Using a new energy recovery facility and its turbine, energy is harnessed from the excess pressure. This energy can be used to partially offset the power requirements of the Capilano Pump Station.  The construction cost of these twin tunnels was anticipated to reach around $400 million.

The original tunnel contractor was terminated by the Owner.  O’C&L worked with the completion contractor and provided project management support services.  Those services included a full-time, on-site Contract Administrator/Deputy Project Manager, critical path method (CPM) Scheduling services, and claims avoidance/dispute resolution consultation.



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