california geotechnical levee evaluation program same/asce midwest levee conference, june 2-5 2008...

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

22

Reduce chance of flooding

Reduce consequences of flooding

Sustain economic growth

Protect and enhance ecosystems

Promote sustainability4

FloodSAFE Goals

33

• 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.

44

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

66

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

2

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)

2

Surveys Traditional land survey LiDar – Light Detection and

Ranging Bathymetry – Multibeam

echosounder

Datum: NAVD88 and NAD83

2

•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

2

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

2

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

2

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: