GEOTECHNICAL LEVEE EVALUATIONS PROGRAM Central Valley Flood Protection Board February 26, 2009 - PowerPoint PPT Presentation

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GEOTECHNICAL LEVEE EVALUATIONS PROGRAM Central Valley Flood Protection Board February 26, 2009 PowerPoint Presentation
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GEOTECHNICAL LEVEE EVALUATIONS PROGRAM Central Valley Flood Protection Board February 26, 2009

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  1. Mike Inamine California Department of Water Resources GEOTECHNICAL LEVEE EVALUATIONS PROGRAMCentral Valley Flood Protection BoardFebruary 26, 2009 California Geotechnical Levee Evaluation Program SAME/ASCE Midwest Levee Conference, June 2-5 2008

  2. Reduce chance of flooding Reduce consequences of flooding Sustain economic growth Protect and enhance ecosystems Promote sustainability FloodSAFE Goals 2 2 4

  3. Statewide Program 4 Major Activities Primarily funded by Propositions 1E and 84 Emphasis on State-federal system in Central Valley and Delta ~10 year effort A multi-faceted program to improve public safety through integrated flood management. 3 3

  4. Planning Activities FloodSAFE Strategic Plan What to accomplish… Improve Flood Management Systems FloodSAFE Implementation Plan How to accomplish… California Water Plan Statewide strategic policy document… Statewide Flood Management Planning System-wide plan for improving integrated flood management in Central Valley … Central Valley Flood Protection Plan Integrated Regional Water Management Plans Regional plans with State assistance… Project Feasibility Studies 4 4 Detailed project studies …

  5. Systemwide Analysis

  6. Geographical Breakdown of Systemwide Analysis “State Flood System in the Central Valley” 6 6

  7. Overview of Levee Evaluations Program Geotechnical Program Supports Central Valley Flood Protection Plan and Local Efforts Urban Levee Evaluations (ULE) Population of 10,000 or more 350 miles of State/federal project urban levees Approximately 120 miles of non-project urban levees Intensive evaluation Governor’s 2006 Emergency Declaration Non-Urban Levee Evaluations (NULE) Populations less than 10,000 1250 miles of State/federal project non-urban levees 400 miles of non-project non-urban levees Strategic evaluation Technical Policy Seismic policy Interim Levee Design Criteria

  8. ULE / NULE Purpose In support of the Central Valley Flood Protection Plan (CVFPP) and other flood management related programs, evaluate non-urban and urban State/Federal project levees, including appurtenant non-project levees, to determine if they meet defined geotechnical criteria and, if appropriate, identify remedial measure(s) to meet those criteria.

  9. NULE/ULE Goals • Goal #1 – Support the CVFPP and CVFED projects, federal and local flood management projects, local FEMA certification efforts and the legislative mandate of urban, 200-year flood protection by 2025. • Goal #2 – Support federal & local flood management programs by providing geotechnical data, analysis and remedial alternatives to local, State and federal stakeholders. • Goal #3 – Improve geotechnical information exchange methods between state, local and Federal flood management agencies. • Goal #4 - Identify critical levee repairs

  10. Objectives • Revisiting timelines, objectives due to budget impasse • Strategic and tactical distinctions between ULE and NULE • Financial limits • Stakeholder process • 200-year urban mandate • Differing phased approaches

  11. Levee Evaluations Urban Levee Evaluations Non-urban Levee Evaluations Technical Policy Seismic Policy North North South Interim Levee Design Criteria Central South Levee Evaluations Portfolio Breakdown

  12. Technical Policy Seismic Policy Develop a statewide seismic policy for urban levee performance, emergency levee remediation, and long-term levee remediation • Interim seismic design guidelines for urban levees • Long-term seismic policy and design criteria for urban levees Interim Levee Design Criteria Provide interim design guidance that enables local and State agencies to construct levees to meet developing 200-year criteria with reasonable certainty and conservatism

  13. Levees under study

  14. Levees under study

  15. General Technical Approach • Literature and background research (Locals, USACE, DWR, Consultants) • Outreach • Geomorphology • Surveying • Geophysics • Exploration • Testing • Analysis • Problem Identification • Remedial alternatives and costs 2

  16. ULE Process

  17. NULE Process

  18. NULE Process (cont’d)

  19. Geomorphology Geophysical Surveys Marysville, CA Helicopter Electromagnetic (HEM)

  20. Surveys • Traditional land survey • LiDar – Light Detection and Ranging • Bathymetry – Multibeam echosounder Datum: NAVD88 and NAD83 2

  21. Subsurface Exploration Program • Methods • Mud-rotary with punch- • core sampling • CPT • Sonic • Advantages • Nearly continuous soil profile • Method optimized for • encountered materials • Economical for large project • Disadvantages • Large volume of sample • generation • Correlation of drilling methods 2

  22. Hydrology and Hydraulics • Design profile (1957 in the north/central and 1955 in the south) • 100-year WSE • 200-year WSE • Top of levee 2

  23. SeepageStabilitySettlementErosionSeismic vulnerability Geotechnical Analyses

  24. NULE First Year Work • Stakeholder briefings • Literature search (Locals, USACE, DWR, Consultants) • Interviews • Inspections • Points-of-Interest • CVFPP Workshops • LiDAR and other surveys • Water surface elevations • Geomorphology • Assessment process • Geotechnical Assessment Report 2

  25. Independent Consulting Board Charge: Provide independent, expert review of geotechnical policies and procedures with regard to safety, performance, state-of-practice and economy • Board Members: • Chris Groves (Shannon-Wilson) • Ray Seed (UC Berkeley) • George Sills (formerly USACE-ERDC) • Skip Hendron • Bill Marcuson 2

  26. Technical Design Review • Four charges for Levee Evaluations: • Central Valley Flood Protection Plan • Support for local projects • Design review of EIP and other design and construction projects • Design and construction support for CVFPB • Scope expansion • Multiple Boards

  27. Time ULE targeted for completion September 2010 NULE targeted for completion August 2011 Money ULE $110M NULE $111M Contract Support Urban Non-Urban QA/QC Independent Consulting Board Seismic research USACE

  28. Concluding Remarks • Urban evaluation 50 percent complete • Initiating non-urban evaluation • Collaboration of DWR, USACE, local stakeholders and consultants, coordinated through Central Valley Flood Protection Plan process • Evolving, stakeholder-driven process • Unprecedented scope • Expanded design review work 2

  29. Questions? 2

  30. Levee • Critical Levee Repairs • 55 critical erosion sites repaired • 47 critical PL 84-99 sites rehabilitated • $290 million State funds spent • Continuing work - 20 critical sites - 17 non-critical erosion sites - 150 non-critical PL 84-99 sites • Levee Evaluations • 350 miles urban federal levees ($85 M) • 150 miles urban nonfederal levees ($45 M) • About 15 holes per mile • Helicopter Electromagnetic Surveys • LiDAR • Bathymetry • 1,250 miles of non-urban levees

  31. Levee State – Local Early Implementation Projects No regrets 2 setback levee projects 2 slurry wall projects $212 million State contribution in FY 07-08 $99 million local contribution in FY 07-08 $400 million State budget for FY 08-09 Segment 3 Fix-in-place Segment 2 Setback levee Existing Levee Setback Levee

  32. Levee State – Local Early Implementation Projects No regrets 2 setback levee projects 2 slurry wall projects $212 million State contribution in FY 07-08 $99 million local contribution in FY 07-08 $400 million State budget for FY 08-09 Segment 3 Fix-in-place Segment 2 Setback levee Existing Levee Setback Levee

  33. Levee • Federal Projects • Many State – Local – Federal Studies and Projects • Active construction on: - Folsom Dam Joint Federal Project - American River Common Features Project - South Sacramento County Streams Project - Sacramento River Bank Protection Project • Federal construction to follow State-Local EIPs

  34. INITIAL RISK California Leads the Way: Taking Steps to Manage Flood Risk in the Central Valley Critical Levee Repairs Levee Evaluations State-Local Early Implementation Projects Federal Projects Central Valley Flood Protection Plan Mitigation Banking Flood Corridor Easements Designated Floodways Reservoir Reoperation and Forecast Based Operation Climate Change Adjustments to Flood Hydrology Floodplain Mapping Annual Flood Risk Notifications New Building Standards Emergency Response Plans Emergency Supplies and Stockpiles Improved Maintenance and Inspection Procedures Local Agency Reports on Maintenance Local Agency Risk Acknowledgement Shared Liability between State and Local Agencies 200-year Minimum Protection for Urban Areas General Plan Amendments and Zoning Ordinances RESIDUALRISK New Ongoing Flood Risk Time / Investment

  35. NULE Goals and Objectives • Goals & Objectives • Goal #1 – Support the CVFPP and Central Valley Floodplain Evaluation and Delineation (CVFED) projects. • Define the levees surrounding non-urban basins utilizing available information by October 1, 2008. • By January 1, 2009, vet the defined locations of non-urban levees with local stakeholders. • Define and vet non-urban geotechnical levee criteria by January 1, 2009. • By March 1, 2009 (June 1, 2009), perform the initial phase of geotechnical evaluation based on available, historical information to determine whether levees: a) are deficient b) possess no obvious deficiencies, or c) sufficient data is lacking to make a determination as to levee performance. Levees shall be evaluated with respect to current geotechnical state-of-practice at the design WSE and top of levee WSE. • Prepare preliminary, remedial alternatives (and associated cost estimates) necessary for acceptable levee performance at the design WSE by June 1, 2009 (July 1, 2009). • Develop the initial geotechnical exploration plan by June 1, 2009 (July 1, 2009). • Deliver the final documentation of geotechnical analysis and remedial alternatives by August 1, 2011. • Goal #2 – Support Federal & local flood management programs by providing geotechnical data, analysis and remedial alternatives to local, State and federal stakeholders. • Publish a list of available data and analysis products for use by local, State and federal stakeholders on the FloodSAFE website by June 1, 2009. • Provide available data and analysis products within 30 days of a request. • Goal #3 – Improve geotechnical information exchange methods between state, local and Federal flood management agencies. • By October 1, 2008, develop an interim non-urban GIS database that will be compatible with a future FloodSAFE-wide database. • By November 1, 2008, develop a GINT database for exploration products. • Goal #4 - Identify critical levee repairs • Identify critical geotechnical deficiencies that may result in levee failure in the next high water event. Recommend further analysis to the Critical Repairs program as deficiencies are identified.

  36. ULE Goals and Objectives: • Goal #1 – Support the CVFPP, federal and local flood management projects, local FEMA certification efforts and the legislative mandate of urban, 200-year flood protection by 2025. • Define the levees surrounding urban basins utilizing available information by September 30, 2008. • By January 1, 2009, vet the defined locations of urban levees with local stakeholders. • Define and vet urban geotechnical levee evaluation criteria by October 1, 2007. • By April 1, 2010, perform geotechnical exploration, testing and analyses required to evaluate the safety of urban levees. Levees shall be evaluated with respect to current geotechnical state-of-practice at the design WSE and top of levee WSE. • Prepare preliminary, remedial alternatives and associated cost estimates necessary for acceptable levee performance at the estimated 200-year WSE by July 1, 2010. • Deliver the final documentation of geotechnical analysis and remedial alternatives by September 1, 2010. • Goal #2 – Support Federal & local flood management programs by providing geotechnical data, analysis and remedial alternatives to local, State and federal stakeholders. • Publish a list of available data and analysis products for use by local, State and federal stakeholders on the FloodSAFE website by January 15, 2009. • Provide available data and analysis products within 30 days of a request. • Goal #3 – Improve geotechnical information exchange methods between state, local and Federal flood management agencies. • By April 1, 2008, develop an interim GIS database for levee evaluation products. • By January 1, 2007, develop an interim GINT database for exploration products. • By September 1, 2010, provide input and support development of a Floodsafe-wide GIS database available to State, local and federal stakeholders. • Goal #4 - Identify critical levee repairs • Identify critical geotechnical deficiencies that may result in levee failure in the next high water event. Recommend further analysis to the Critical Repairs program as deficiencies are identified.