Pinawa Diversion Dam - Rehabilitation Design, Construction and Post Construction Downstream Flow Monitoring

Kris F.J. Matusiewicz, Kent W. Bannister, Denis Dubois

In the proceedings of: GeoManitoba 2012: 65th Canadian Geotechnical Conference

Session: T1C - Design of Earth Dams

ABSTRACT: As a result of age, changes to the Canadian Dam Association (CDA) Dam Safety Guidelines, and performance concerns; Manitoba Hydro identified a requirement to upgrade the existing Pinawa Diversion Dam. The Pinawa Diversion Dam was originally constructed in 1906 as a concrete and wooden stop-log control structure supporting the Pinawa ised by constructing a rockfill dam with a sand and gravel upstream seal, burying the old control structure in place. The rehabilitation design of the dam included; maintaining riparian flows downstream of the structure, improving stability, eliminating internal erosion concerns, raising the crest elevation, and meeting CDA Dam Safety Guidelines. Construction of a new flow-through rockfill structure was constructed downstream of the existing dam in the winter 2011. Post construction flow monitoring started following the rehabilitation construction; to date there have been no notable changes to the downstream channel flows.

RÉSUMÉ: Manitoba Hydro a trouvé nécessaire de moderniser le barrage de dérivation de Pinawa tenant compte du vieillissement de la structure, des changements apportés aux Recommandations de la ACB et des préoccupations concernant poutrelles en bois pour dériver le débit inscentrale de Seven Sisters a été construite, la crête du barrage de Pinawa a du être surélevée en construisant par dessus le et gravier. Les critères établis pour la modernisation du barrage devaient assurer les écoulements minimums en aval de la t devLe projet est passé par en hiver 2011. La surveillance du flux après la construction de réadaptation; à ce jour il n'ya eu aucun changement notable sur les flux de canal en aval.

Please include this code when submitting a data update: GEO2012_74

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