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HYDRO-QUÉBEC
INSPECTION OF THE SAINT-NARCISSE DAM
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CLIENT
Hydro-Québec
LOCATION
Saint-Narcisse, Mauricie
DURATION
1994
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PROJECT CHARACTERISTICS
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The works were performed in conjunction with Hydro-Québec's operations group. |
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Given the height of the installations, visual surface inspections were conducted using the rappelling technique and climbing equipment. |
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In addition to the underwater inspection, concrete core drilling was also done underwater. |
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Lastly, Casagrande piezometers were installed in all of the drill holes. |
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SERVICES RENDERED
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Detailed description of the characteristics of concrete surfaces |
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Coring and drilling of concrete elements |
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Underwater inspection |
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Inspection of steel components |
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Inspection of buildings (water inlet and central) |
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PROJECT DESCRIPTION
The Saint-Narcisse facilities include a dam, completely spanning the river, and a central station more than 500 metres downstream, the two connected by an underground headrace. The dam, 21 metres high, includes a water inlet, a gravity dam structure, a weir, a 3-sluice spillway, a logway and two wing walls with earth embankments. A total of 7 HQ-3 drill holes and 21 boreholes with a 100‑mm diameter were made. The investigation led to recommendations for rebuilding the dam so as to
ensure its safe operation for an additional 30-year period.
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