Authors: R. Hibbs, G. Snyder, D. McEwen, E. Locke
Canadian Dam Association Conference, Winnipeg, September 2008
Abstract
Nova Scotia Power engaged Hatch Energy to undertake the design and implementation of repairs to the Harmony Dam on the Medway River. The existing dam had five bays of traditional wooden stoplogs with a travelling electric log hoist; it was very labour intensive to remove and replace the stoplogs. Previous work on the structure had sealed two of the original seven stoplog bays and focused the flood handling on manual removal of crest boards on the overflow section of the dam. A flood analysis had shown that the structure had sufficient capacity to handle its design flood, but not in a safe and timely
manner. As part of the repairs, the flood handling system was changed so that flows up to a 1/100 AEP event were handled by the overflow weir without operator intervention and any additional capacity required for extreme events could be addressed using quick-release stoplog bays.
