Mike Inamine

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GEOTECHNICAL LEVEE EVALUATIONS PROGRAM Central
Valley Flood Protection BoardFebruary 26, 2009

• Mike Inamine
• California Department of Water Resources

California Geotechnical Levee Evaluation
Program SAME/ASCE Midwest
Levee Conference, June 2-5 2008
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FloodSAFE Goals

• Reduce chance of flooding
• Reduce consequences of flooding
• Sustain economic growth
• Protect and enhance ecosystems
• Promote sustainability

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A multi-faceted program to improve public safety
through integrated flood management.

• 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

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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
Central Valley Flood Protection Plan
System-wide plan for improving integrated flood
management in Central Valley
Integrated Regional Water Management Plans
Regional plans with State assistance
Project Feasibility Studies
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Detailed project studies
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Systemwide Analysis

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Geographical Breakdown of Systemwide Analysis
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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
• Governors 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

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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.
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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

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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

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Levee Evaluations Portfolio Breakdown
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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

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Levees under study
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Levees under study
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General Technical Approach

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

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ULE Process
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NULE Process
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NULE Process (contd)
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Geomorphology
Geophysical Surveys
Marysville, CA
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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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

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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

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SeepageStabilitySettlementErosionSeismic
vulnerability
Geotechnical Analyses
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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

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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

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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

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• 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

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Questions?
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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

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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
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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
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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

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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
RESIDUAL RISK
New Ongoing
Flood Risk
Time / Investment
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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.

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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.

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