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Sabol Sess3 100909

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  • 1. Capay Diversion Dam Modernizing for Sustained Irrigation Demand George V. Sabol, PhD, PE Principal, Stantec Consulting Tim O’Halloran, PE General Manager, Yolo County Flood Control & Water Conservation District Michael Horgan, PE Engineer, Yolo County Flood Control & Water Conservation District 2009 SAME California Water Conference Sacramento, California October 27-28, 2009
  • 2. Capay Dam on Cache Creek in Yolo County, California Los Angeles San Diego San Francisco Sacramento
    • Two upstream water supply reservoirs.
    • District releases 250,000 acre-feet of water when full irrigation supply is available.
    • All Irrigation water is diverted from Cache Creek at Capay Dam.
    • Water is delivered to 60,000 acres.
    Yolo County Flood Control & Water Conservation District
  • 3. Davis, CA Woodland, CA
  • 4. Photo from Helicopter 470-foot long Capay Dam Grade Control Structure Winters Canal West Adams Canal Cache Creek Apron Replacement
  • 5. Capay Dam – Bladder Deflated, Winter Low-Flow
  • 6. 2005 Inspection of Dam
  • 7. Reproduction of 1914 design drawing with 2003 observations in red.
  • 8. 2003 Partial Failure of Apron
  • 9. Local Scour at Toe of Apron & Streamed Degradation of Cache Creek
  • 10. Sediment Deposition above Dam
  • 11. Sediment Abrasion of Concrete Since 1993
  • 12. Sediment Damage to Concrete Piers Since 1993
  • 13. Placing Drill Rig on Apron in 2005
  • 14. Non-Destructive Testing of Concrete in 2005
  • 15. Cracking & Distress of Concrete Abutment Wall
  • 16.  
  • 17.
    • Conditions at Dams Change Over Time:
    • Sand & gravel mining in the floodplain
    • Urbanization and increased risk
    • Encroachment into the floodplain from farming
    • Bridge & highway encroachment
    • Riparian vegetation (growth or removal)
    Conclusions
  • 18.
    • Cumulative Impacts from Rivers can
    • Jeopardize Structures Such as Dams
    • Streambed degradation
    • Sedimentation or local scour
    • Concrete erosion & deterioration
    Conclusions
  • 19.
    • Old Structures are Vulnerable
    • Old design standards may be inadequate
    • Old construction practices may lead to latent defects
    • Structures deteriorate over time exacerbating design deficiencies and construction defects
    Conclusions
  • 20. Periodic Inspections are Necessary for Dams & Levees. Modern Testing Methods are Cost Effective in Assessing Structural Integrity of Dams. Conclusions