Project Summary ennett Dam retains the 230-mile long Williston Lake, the 10th largest reservoir in the world. Electricity generated at the powerhouse satisfies almost 30 percent of the power requirements for British Columbia. When a small sinkhole developed on the crest of the 600-ft high dam, initial investigation triggered a 23-ft deep drop-out. Subsequent exploration revealed that the sinkhole had developed around a corrugated metal pipe surve

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