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Sabol Sess3 100909
 

Sabol Sess3 100909

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    Sabol Sess3 100909 Sabol Sess3 100909 Presentation Transcript

    • 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
    • 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
    • Davis, CA Woodland, CA
    • Photo from Helicopter 470-foot long Capay Dam Grade Control Structure Winters Canal West Adams Canal Cache Creek Apron Replacement
    • Capay Dam – Bladder Deflated, Winter Low-Flow
    • 2005 Inspection of Dam
    • Reproduction of 1914 design drawing with 2003 observations in red.
    • 2003 Partial Failure of Apron
    • Local Scour at Toe of Apron & Streamed Degradation of Cache Creek
    • Sediment Deposition above Dam
    • Sediment Abrasion of Concrete Since 1993
    • Sediment Damage to Concrete Piers Since 1993
    • Placing Drill Rig on Apron in 2005
    • Non-Destructive Testing of Concrete in 2005
    • Cracking & Distress of Concrete Abutment Wall
    •  
      • 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
      • Cumulative Impacts from Rivers can
      • Jeopardize Structures Such as Dams
      • Streambed degradation
      • Sedimentation or local scour
      • Concrete erosion & deterioration
      Conclusions
      • 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
    • Periodic Inspections are Necessary for Dams & Levees. Modern Testing Methods are Cost Effective in Assessing Structural Integrity of Dams. Conclusions