March 7, 2007

1. The Resources AgencyCalifornia Department of Water ResourcesDWR Program for the Repair of the California Levee System March 7, 2007

2. Presentation Outline • Background • Description of Projects • Critical Erosion Repairs • PL84-99 • Urban Levee Geotechnical Evaluation

3. Central Valley Flood Control System Projects: • 2.5 million people • 2 million acres of cultivated land • 200,000 structures with an estimated value of $57 billion • Water supply to 2/3rds of the State’s population and industry The system is aging and under-funded

4. KEY CHALLENGES IN CENTRAL VALLEY 1600 miles of Federal Project Levees 700 miles of local Delta Levees 2300 miles of Levees • Old levees, many originally built by farmers, most without adequate engineering • Aging system, continuing deterioration (e.g. erosion, seepage distress, burrowing rodents)

5. Methods and materials used during early construction are inappropriate by today’s standards.

6. Some methods included manual labor only. Repair was generally reactive (as a result of periodic failures).

7. CRITICAL LEVEE EROSION REPAIRS PROJECT • Annual Survey Commissioned by U. S. Army Corps of Engineers • 2005 Survey reported 174 Erosion Sites

8. Levee and Bank Erosion 4

9. Levee Erosion

10. 3 ft in 4-6 hours 7 ft in 12-20 hours 10 ft in 24-36 hours 17 ft in 6-8 days 7

12. State Emergency Declaration • Governor declared State of Emergency for State’s levee system (February 24, 2006) • Directed DWR to repair 24 Critical Erosion Sites before the next flood season • Directed DWR to evaluate additional sites to determine if other levee reaches require urgent repairs • Directed all state agencies to alleviate the emergency in accordance with the State Emergency Plan • USACE Declaration of Emergency • ( For 24 new levee erosion sites (November 7, 2006) • Enables construction concurrent with environmental assessments and mitigation plans

13. Requested Federal Emergency Declaration • Requested federal • emergency assistance • Full state-federal cost share • Cooperation and assistance • from the Corps of Engineers • Expedite process for federal • permits, construction

14. Project Description – Emergency LeveeErosion Repairs • Repair 24 critical erosion sites before November 1, 2006 • 20 conventional rock reinforcement • 4 set-back levees • Identify and evaluate other sites degraded during sustained high flows throughout the wet season. • Evaluated 11 potential critical sites – determined that an additional 5 sites had degraded to critical status - need to repair these 5 newly critical sites! • Evaluated 19 additional erosion sites at the request of local officials for consideration for emergency repairs

15. Critical Site: Sites where further erosion may result in a bank failure, which encroaches near or into the levee crown and is recommended as the highest priority for repair 24 Original Critical Sites 5 Additional Sites Found to be Critical (previously potentially critical sites that have deteriorated over the last year) ____________________________________________________ 29 Current Critical Sites 10 Critical Sites to be repaired by USACE 19 Critical Sites to be repaired by DWR ________________________________________________ 29 Current Critical Sites

16. Task Activitiesfor Repair of the Critical Erosion Sites • Environment Permitting • Right of way acquisition • Surveying and site assessments • Design and prepare construction contracts • Construct erosion repairs • Incorporation of “self-mitigation” features to reduce environmental impacts associated with the project repairs.

17. Typical Rock Fill Repair Design Example of a Self-mitigating Repair:

18. “PHASE 1” CONSTRUCTION IS THE PLACEMENT OF TOE ROCK AND ROCK FILL UP TO DESIGN BENCH ELEVATION. Typical Rock Fill Repair Design(Continued)

19. Project GoalLong-term Bank Erosion Control and Levee Stabilization Mitigation FeaturesGoal is Self-Mitigation SAC 85.6R

20. Protection of Existing Trees • Installation of willow fascine bundles to propagate shaded riverine aquatic (SRA) habitat near the water’s edge • Installation of willow pole cuttings

21. Riparian bench (planting to be completed next spring) • In-stream woody material (IWM) at multiple levels to maximize fisheries benefits • Revegetation of all soil slopes (including rill erosion control).

22. Key Regulatory Hurdles • Clean Water Act Section 404/ Rivers and Harbors Act Section 10 (Corps) • Endangered Species Act (NOAA and USFWS) • National Environmental Policy Act (Corps) • California Environmental Quality Act (DWR) • Other State Programs (401, 1602)

23. Land Access Critical Erosion Site Levee Repair

24. Water Access Critical Erosion Site Levee Repair

25. 2005 Critical Repairs Status TOTAL CONSTRUCTION: • 29 of 33 sites (levee repairs) are structurally complete, with remaining mitigation vegetation planting planned for Spring 2007. • 4 of 33 sites (setback levees) are fully complete. • Cumulative Length of Repairs: 33,800 LF (~6.4 mi.) TOTAL COST for 33 Sites: • $189.5 million dollars ($150.3M State / $39.1M Federal) (~$5,700 per LF of self-mitigating repair).

26. Catching up with 2006 • Critical Repairs had focused on 2005-identified sites. • Two major storm events (January and April 2006) caused significant, additional flood damage throughout the State • The 2006 field reconnaissance by the USACE on the Sacramento River mainstem and delta identified 24 newly designated “critical” sites (excludes tributaries and bypasses).

27. INCIDENTS January 2006 Flood Event • DWR responded to • over 60 incidents • Central Valley: 29 • Delta: 27 • Suisun Marsh: 3 • Coastal: 3 • Sierra: 1

28. April 2006 Flood Event INCIDENTS • DWR responded to • over 45 incidents • Central Valley: 21 • Delta: 3 • Sierra: 2 • Advanced Measures: 19+

29. 2006 Emergency Repairs Program Priority 1: 40 Order 1 (Urban) PL84-99 Sites Priority 2: 24 2006 Ayres/USACE Critical Erosion Priority 3: 7 Order 2 (Rural) PL84-99 Sites (High B/C Ratios) 71Critical Levee Sites DEFERRED: 44 Order 2 (Rural) PL84-99 Sites (Low B/CRatios) 75 Ineligible PL84-99 Sites 222 Non-Critical Order 3, 4, and 5 PL84-99 sites 341 Deferred Sites

30. Critical Repairs Schedule • Phased Construction of 24 Critical Sites (construct through the winter to place launch rock and abate scour to levee bank) • Final repairs to be constructed Summer / Fall 2007 • Complete repairs of 47 Order 1 & 2 PL84-99 sites by Summer / Fall 2007 • USACE to Re-assess economic opportunities to repair DEFERRED sites (341) • USACE & DWR - Continue monitoring known sites and conduct annual field reconnaissance to identify and prioritize new critical levee erosion sites.

31. Estimated Cost of 2006 Repairs • 24 Critical Levee Erosion Repairs: • State: $ 43.2 Million • Federal: $ 61.5 Million $104.7 Million • PL84-99 Repairs (47 sites): • State & Federal: $ 40.4 Million EST. 2006 PROGRAM TOTAL: $145.1 Million Combined 2005/2006 Program: $334.5 Million (Source of funding: AB-142) • Environmental mitigation costs account for between 25%-50% of the total capital construction cost.

32. Urban Levee Geotechnical Evaluation Purpose – Identify hidden deficiencies in levees that protect urban areas – State and Federal Urban Levees. • Evaluate levees with respect to: • Seepage • Static and seismic stability • Settlement • Erosion • 200-year level of flood protection • Meet USACE/FEMA criteria for certification • Preliminary design alternatives for identified deficiencies

33. Urbanized Regions

34. “Hidden” defects Sand layer found in existing levee during repairs. Layer goes through to other side; This area sustained significant seepage during the 1997 event

35. Scope of Work • Geotechnical Evaluation • Exploration • Testing • Data Analysis and Characterization • Certification • Structural works: a statement that the works are designed in accordance with sound engineering practice • As-built conditions: a statement that the structures have been constructed according to the design, are in place and are fully functioning Levee Decertified GER • Structural Design* • Embankment Height • Closures • Embankment Protection • Embankment and Foundation Stability • Settlement • Seepage Review Levee Freeboard Operation & Maintenance Plan Submit LOMR/PMR FEMAReview Interior Drainage Analysis Levee Accredited DFIRM Revised

36. Management Process & Approach

37. Focused on3 Major Areas • This $35 million, 3-Yr effort is geographically executed: • North Area (Yuba City and Marysville Region) • Central Area (Sacramento Region) • South Area (Stockton Region)

38. Program Schedule

39. Additional, Concurrent DWR Activities • American River Common Area – provides for the improvement of American River levees protecting Sacramento ($2.1M from AB-142; w/ USACE, Rec Bd, & SAFCA) • Sutter Bypass Weir 2 Improvements – provides analyses and design to improve facility to meet environmental compliance ($2.5M) • Willow Slough Weir Improvements – provides analyses and design to improve facility to meet environmental compliance ($2.5M) • Pump Station Rehabilitation – provides for the improvements to facilities near Yuba City ($2.5M) • Fremont Weir Maintenance – provides for the removal of approx. 800,000 CY of sediments near this flood control facility ($2.0M)

40. For more informationvisit DWR’s Levee Website at: www.levees.water.ca.gov For water conditions, go to: www.water.ca.gov then select “Water Conditions”

42. Thank you