During the project, the team encountered the challenge of lowering an existing lake eight metres to facilitate excavations. HJOC tripled the dewatering rate by pumping water into an adjacent small pond and using a natural streambed, in combination with a diversion channel, to allow the water flow to be increased without causing negative environmental impact. By increasing the drawdown rate, Bird was able to accelerate the project schedule.
During construction, winter weather conditions posed a threat to the schedule. However, through value engineering, HJOC altered the original design scope and positioned the first dam one metre downstream to allow the grout trench and dams to be built independent of one another, rather than dependently as originally proposed. Subsequently, the team was able to deliver the project ahead of schedule and without any lost time incidents.
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