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Sabol Sess3 100909


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Sabol Sess3 100909

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