Research Article
Jun 1970
Diversion at Portage Mountain Project
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VIEW THE REPLYAbstract
A 15 yr flood of 270,000 cfs was ued for the design of the diversion facilities during dam construction. The design flow was determined by extending flow records through correlation with neighboring rivers. The diversion path was an open cut intake channel, 800 ft long and 280 ft wide, leading into three 48-ft diam., horseshoe-shaped, concrete-lined tunnels, designed for free flow. Savings resulted from using depressed tunnel inverts with upshots at the outlet portals, and from the 2-ft thick unreinforced lining. The depressed inverts provided supercritical flow in the tunnels and the upshots proved beneficial in deflecting flow form the river bottom at the tunnel outlets. Diversion was accomplished by blowing a rock plug at the entrance to the intake channel and completing closure of the diversion cofferdam. The tunnel successfully carried an instantaneous peak flow of 314,000 cfs.
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Information & Authors
Information
Published In
Journal of the Power Division
Volume 96 • Issue 3 • June 1970
Pages: 349 - 368
Copyright
© 1970 American Society of Civil Engineers.
History
Published in print: Jun 1970
Published online: Feb 11, 2021
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Authors
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Harold K. Pratt, F.ASCE
Chief Engr., British Columbia Hydro and Power Authority, Vancouver, British Columbia, Canada
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.