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BC Hydro - Vancouver Island Generation Dam Safety Presentation for - - PowerPoint PPT Presentation

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BC Hydro - Vancouver Island Generation Dam Safety Presentation for Jordan River December 12, 2014 BC HYDRO DAM SAFETY PROGRAM 41 dam facilities province-wide in 23 watersheds Ongoing dam safety studies and modelling, maintenance and

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BC Hydro - Vancouver Island Generation Dam Safety Presentation for Jordan River

December 12, 2014

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BC HYDRO DAM SAFETY PROGRAM

  • 41 dam facilities province-wide in 23 watersheds
  • Ongoing dam safety studies and modelling, maintenance and

upgrades

  • Near real-time dam safety monitoring, including 24/7 monitoring,

and weekly visual inspections by crews

  • Semi-annual inspections; independent reviews (7 – 10 years)
  • 2013 Independent Dam Safety Audit

Go to www.bchydro.com/damsafety

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NEW SEISMIC HAZARD MODEL

  • Updated model provided better understanding of ground motion

and hazard for all BC Hydro dams. Previous models outdated.

  • First hydroelectric utility in North America to develop the rigorous,

best-in-class seismic hazard model. Comparable to process used by nuclear industry.

  • Six years of research by BC Hydro and international experts
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WHY NEW RESEARCH?

  • What has changed since then?
  • More data
  • Improved understanding of B.C. seismotectonics
  • Ground motion models
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THE CASCADIA SUBDUCTION ZONE

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IMPACT ON SYSTEM

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BC HYDRO SEISMIC SAFETY

IMPACT ON SYSTEM

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IMPACT ON SYSTEM – ALL EARTHQUAKES

Bear Creek Jordan Elliott

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JORDAN DIVERSION DAM

Current seismic withstand = 0.45g 40m high 230m long

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CONCRETE BUTTRESS DAM

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1990’S UPGRADES

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CASCADIA EARTHQUAKE EVENTS

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ASSESSMENT / CONSIDERATIONS

  • 1. Upgrade Further or Replace
  • 2. Lower the reservoir or Decommission
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DAM DESIGN LEVELS

Chance per year Ground Motion (g) 1 in ten thousand 1.5 1 in a thousand 0.9 1 in 500 0.37

Current Withstand about 0.45g CDA Guideline Feasible Upgrade

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JORDAN RIVER ELECTRIC SYSTEM

  • Bear Creek Dam (1912)
  • Upgrades in the 1970s/1990, including seismic
  • Jordan River Diversion Dam (1913)
  • New powerhouse (1971), extensive upgrades in 1958,1971

and 1991, including seismic

  • Elliot Dam (1970)
  • Used as needed to provide electricity during peak use

hours for Southern Vancouver Island and to support transmission line outages.

  • System supplies about 10% of the Island’s needs.
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VANCOUVER ISLAND TRANSMISSION

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JORDAN RIVER FINDINGS

  • In a major earthquake resulting in structural damage to

buildings, immediate downstream evacuation will be critical.

  • In a worst-case scenario where the dam is jeopardized
  • r fails, water could arrive into the inundation zone as

quickly as 20 minutes; a tsunami could arrive in 45 minutes.

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NEXT STEPS

  • Work with local residents, businesses, First

Nations and local authorities to:

  • Improve local emergency planning/awareness
  • Ensure businesses and recreational interests

can continue to operate

  • Limit future development within evacuation

area

  • Offer to purchase homes