S-3.1.01, r. 1 - Dam Safety Regulation

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50. A dam safety review must be conducted, and the attendant report sent to the Minister, every 10 years. That frequency is increased to 15 years and 20 years for dams in the Low and Very Low Consequence category, respectively.
Where a dam undergoes a structural alteration that affects all parts of the structure or that, because of the scope of the work, is equivalent to reconstructing the dam, the schedule of reviews and reports is moved forward, the period for the next review and report being computed from the year of completion of the work.
O.C. 300-2002, s. 50; O.C. 17-2005, s. 9.