california geotechnical levee evaluation program same/asce midwest levee conference, june 2-5 2008...
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California Geotechnical Levee Evaluation Program SAME/ASCE Midwest Levee Conference, June 2-5 2008
Mike InamineCalifornia Department of Water Resources
GEOTECHNICAL LEVEE EVALUATIONS PROGRAM Central Valley Flood Protection Board
February 26, 2009
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Reduce chance of flooding
Reduce consequences of flooding
Sustain economic growth
Protect and enhance ecosystems
Promote sustainability4
FloodSAFE Goals
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• 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.
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FloodSAFEStrategic Plan
FloodSAFEStrategic Plan
FloodSAFEImplementation Plan
FloodSAFEImplementation Plan
California Water PlanCalifornia Water Plan
Central ValleyFlood Protection Plan
Central ValleyFlood Protection Plan
Integrated Regional Water Management Plans
Integrated Regional Water Management Plans
Statewide FloodManagement Planning
What to accomplish…
How to accomplish…
Statewide strategic policy document…
System-wide plan for improving integrated flood management in Central Valley …
Regional plans with State assistance…
Planning Activities
Project Feasibility StudiesProject Feasibility Studies Detailed project studies …
Improve Flood
ManagementSystems
Systemwide Analysis
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Geographical Breakdown of Systemwide Analysis
StatewideStatewide
Central ValleyCentral Valley OutsideCentral Valley
OutsideCentral Valley
Central ValleyFlood Protection System
Central ValleyFlood Protection SystemDeltaDelta
OtherOtherState/FederalSystem
State/FederalSystemOtherOther
StatewideStatewide
Central ValleyCentral Valley OutsideCentral Valley
OutsideCentral Valley
Central ValleyFlood Protection System
Central ValleyFlood Protection SystemDeltaDelta
OtherOtherState/FederalSystem
State/FederalSystemOtherOther
“State Flood Systemin the Central Valley”
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
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.
• 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
NULE/ULE Goals
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
Levee Evaluations
Non-urban Levee Evaluations
Technical PolicyUrban
Levee Evaluations
Seismic Policy
Interim LeveeDesign Criteria
North
South
South
Central
North
Levee Evaluations Portfolio Breakdown
Seismic PolicyDevelop 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 CriteriaProvide interim design guidance that enables local and State agencies to construct levees to meet developing 200-year criteria with reasonable certainty and conservatism
Technical Policy
Levees under study
Levees under study
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Literature and background research (Locals, USACE, DWR, Consultants)
Outreach
Geomorphology
Surveying
Geophysics
Exploration
Testing
Analysis
Problem Identification
Remedial alternatives and costs
General Technical Approach
ULE Process
NULE Process
NULE Process (cont’d)
Geomorphology
Marysville, CA
Geophysical Surveys
Helicopter Electromagnetic (HEM)
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Surveys Traditional land survey LiDar – Light Detection and
Ranging Bathymetry – Multibeam
echosounder
Datum: NAVD88 and NAD83
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•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
Subsurface Exploration Program
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Hydrology and Hydraulics
Design profile (1957 in the north/central and 1955 in the south)
100-year WSE
200-year WSE
Top of levee
SeepageStabilitySettlementErosionSeismic vulnerability
Geotechnical Analyses
2
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
NULE First Year Work
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Charge:Provide independent, expert review of geotechnical policies and procedures with regard to safety, performance, state-of-practice and economy
Independent Consulting Board
Board Members: Chris Groves (Shannon-Wilson) Ray Seed (UC Berkeley) George Sills (formerly USACE-ERDC) Skip Hendron Bill Marcuson
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
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
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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
Questions?
LeveeCritical 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
LeveeState – 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 3Fix-in-place
Segment 2Setback levee
Existing Levee
SetbackLevee
LeveeState – 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 3Fix-in-place
Segment 2Setback levee
Existing Levee
SetbackLevee
LeveeFederal 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
California Leads the Way: Taking Steps to Manage Flood Risk in the Central Valley
Time / Investment
Flo
od
Ris
k
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
RESIDUAL RISK
NewOngoing
INITIAL RISK
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.
• 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.
ULE Goals and Objectives:
