The document discusses California's levee issues and the risks to people and water supplies. Some key points include: - The New Orleans hurricane of 2005 caused over 1,500 deaths and displaced over 400,000 people, costing $100-150 billion in losses. - California's Central Valley Flood Control Project aims to protect over 1 million people, critical infrastructure, water supplies for 24 million people, and ecosystems but faces risks from levee failures. - Levee failures can occur suddenly from earthquakes, erosion, overtopping, or seepage/piping. The Delta region faces a 1-2% annual risk of catastrophic damage from seismic events.

1. Dr. R. B. Seed California’s Levee Issues: People and Water Supplies at Risk

4. 17 th Street Canal

5. Lessons for California

6. New Orleans U.S. Dams U.S. Dams

7. New Orleans U.S. Dams U.S. Dams

9. 50 to 75 30 to 60

12. Sacramento Pocket Area

13. Sacramento Urban Area – 200-year Flood Scenario

14. Continuing Development in Deep Floodplains

16. California Moving Proactively : - Calif. DWR & USACE - $6.5 billion State bonds - Re-evaluate Urban and Non-Urban levees in the Central Valley - 100-yr level of protection for Urban levees by 2012… - and a plan for 200-yr by 2025 - Seismic policy and criteria to be developed (2012)

18. From: Les Harder

20. 162 Islands Flooded in the Delta Since 1900

21. Sudden/Unexpected Levee Failures Earthquake Failures Erosion by Winds and Waves and River Flows Overtopping Failures Seepage/Piping

27. 1989 Loma Prieta Earthquake

28. 1940 El-Centro EQ

29. Bay Area Faults (DRMS)

30. Comparison with Other Studies (100-yr Return Period Ground motions, Stiff Soil Sites)

32. Annual Probability of Catastrophic Seismic Damage to the Delta: P f ≈ 1% to 2% per year (DRMS, 2008)

33. Resource Management Associates 50 Breach Simulation – July 1 Prior to the Event

34. Resource Management Associates 50 Breach Simulation – July 1, 12 hours after the failures

35. Resource Management Associates 50 Breach Simulation – 30 Days After the Failures

38. DELTA VISION PLAN Co-Equal Values : Eco-System and Water Supply Governance : Fair and Just Comprehensive in Outlook Adaptable over Time Responsible/Capable Trust : Without establishing trust, the various disparate interest groups cannot make forward progress….. Solutions must be Comprehensive : Eco-systems vs. Water Use Water Transmission/Storage/Conservation Local “In Delta” Interests and Values, etc.