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Santa Maria River Levee

Santa Maria River Levee. Cook & Broadway Santa Maria 1914. Santa Maria River Levee. 26 Miles Compacted Sand Rock Slope Protection Facing. Santa Maria. Guadalupe. Levee Cross Section. Base Road. Compacted Sand.

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Santa Maria River Levee

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  1. Santa Maria River Levee Cook & Broadway Santa Maria 1914

  2. Santa Maria River Levee • 26 Miles Compacted Sand • Rock Slope Protection Facing Santa Maria Guadalupe

  3. Levee Cross Section Base Road Compacted Sand City River x x x Rock Slope Protection

  4. SM River Levee Quick Facts • Built 1959 – 1963; Part of Santa Maria Project • Built by Feds – US Army Corps of Engineers • Designed to a flow of 150,000 cfs • Owned and Operated by Santa Barbara County Flood Control District

  5. So What is the Problem? • River Flows 20-25 Feet Per Second • Failure is from Below (Scour) • Rock Facing is Inadequate (18” thick)

  6. Santa Maria River Damage History • 1966 – Revetment Damages • 1969 – Near Breach • 1978 – Revetment damages • 1983 – Revetment damages • 1995 – Revetment Damages • 1998 – Total Breach, other Revetment Damage • 2001 – Revetment Damage

  7. SM River Levee – Critical Areas Suey Rd East of Landfill

  8. Levee Break Inundation Area – Corps of Engineers March 1980 “Supplement to Design Memorandum 2” Suey Road Breach

  9. Santa Maria River Levee – Suey Breach Inundation Breach Point

  10. Levee Break Inundation Area – Corps of Engineers March 1980 “Supplement to Design Memorandum 2” Bradley / SM Landfill Breach

  11. Santa Maria River Levee – SM Landfill / Bradley Breach Inundation Breach Point

  12. Historic Photos – 1966 - 1969 Below – SM Levee in 1966 Failed Section Above – SM Levee in 1969 Note Flow Patterns

  13. Santa Maria River Levee - 1969

  14. Santa Maria River Levee1998

  15. 1998 Breach – North Levee • Meandering Flows Impinge in Levee • 1000 feet of Levee lost • Flow was less than 30,000 cfs • Breach Plugged in 24 hours

  16. 1998 Breach – North Levee

  17. SM River Levee Remedial Efforts

  18. “Low Tech Groins” - 2005

  19. USGS Topo Map – Santa Maria Valley

  20. 3-D View of Santa Maria Valley

  21. Questions

  22. Where your property taxes go...

  23. Scan 1969 report pictures / stories

  24. Questions

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