29th USSD Annual Meeting and Conference on

“Managing our Water Retention Systems” April 20-24, 2009 - Nashville, Tennessee

www.ussdams.org

Monday, April 20

7:00 a.m. - 6:00 p.m. Registration

9:00 a.m. - 4:30 p.m. Committee Meetings

4:30 p.m. - 6:00 p.m. 2009 Annual Meeting of Members

Presiding — USSD President Kenneth A. Steele, Consultant

6:00 p.m. - 8:00 p.m. Kick-off Reception

Tuesday, April 21

7:00 a.m. - 6:00 p.m. Registration

7:00 a.m. - 8:00 a.m. Continental Breakfast in Exhibit Hall

8:00 a.m. - 10:00 a.m. Opening Plenary Session

Moderator — Kenneth A. Steele

Introduction and WelcomeKenneth A. Steele

Host WelcomeTBA, Corps of Engineers

10:00 a.m. - 10:30 a.m Break in Exhibit Hall

10:30 a.m. - 12:00 noon Opening Plenary Session, continued

Moderator — Daniel L. Johnson, GEI Consultants, Inc.

Is DAM Such a Bad Word? A Review of the Perception of DamsKevin Griebenow and Manoshree Sundaram, Federal Energy RegulatoryCommission

An Urban Geolevee Evaluation ProgramRich Millet, URS Corporation; Mike Inamine and Steve Mahnke, CaliforniaDepartment of Water Resources; Sujan Punyamurthula and Juan Vargas, URSCorporation

The 50 Year Myth — An Examination of Dam Failure vs. Age of DamsPatrick J. Regan, Federal Energy Regulatory Commission

12:00 noon - 1:15 p.m. Lunch

Moderator — Kenneth A. Steele

Speaker — To be announced

1:30 p.m. - 3:00 p.m. Concurrent Session 1A — Concrete Dams I

Moderators — Michael F. Rogers, MWH; and William R. Fiedler, Bureau of

Reclamation

Center Hill Dam — Mitigating Effects of Alkali Aggregate Reaction with VerticalSlotsKen Hull, Corps of Engineers

Post-Tensioned Trunnion Anchor Rod Failures at West Point DamGeorge V. Poiroux and Davood Tashbin, Corps of Engineers

Buchanan Dam — Effects of Deterioration on Reinforced Concrete CapacityMike Ledesma and Guy S. Lund, URS Corporation

1:30 p.m. - 3:00 p.m. Concurrent Session 1B — Hydrology andHydraulics I

Moderators — Jerry W. Webb, Corps of Engineers; and James E. Lindell,

MWH

Dam Failure Scenarios and Model Comparison at Martis Creek DamLaura LaRiviere and Charles Larson, Kleinfelder, Inc.

Calibrating a Probable Maximum Flood Simulation on the Lower SusquehannaRiverBryce Mochrie, PB Power; Ted Rineer, Safe Harbor Water Power Corp.; andJay Greska and C.E. Tsai, PB Power

Spillway Widening Optimization for Passing Increased PMFVik Iso-Ahola, James Lindell and John Haapala, MWH Americas, Inc.

29th USSD Annual Meeting and Conference

Managing Our Water Retention Systems

April 20-24, 2009

1:30 p.m.- 3:00 p.m. Concurrent Session 1C — Instrumentation

Moderators — James Hummert, URS Corporation; and Jay N. Stateler, Bureau

of Reclamation

A Public Alert System for Dam Discharge Using Wireless Sensor NetworkSea Hoon Kim, Korea Water Resources Corporation

Event Driven Performance Monitoring System, John Day Lock and Dam,Columbia River, Oregon-Washington, USADavid H. Scofield, Corps of Engineers; Barry Myers, Engineered MonitoringSolutions, and Salina Hart, Corps of Engineers

Blasting Adjacent to Existing Critical Dam Infrastructure — Controls, Thresholds,and MonitoringRichard E. Smith and Thomas J. Danielson, Corps of Engineers

1:30 p.m. - 3:00 p.m. Concurrent Session 1D — Rock Mechanics I

Moderators — Terrence E. Arnold, MWH; and John R. France, URS

Corporation

Geotechnical and Geological Characterization of Foundation BlocksIncorporating Digital Photogrammetric Mapping and Borehole GeophysicalLogging to Create Comprehensive 3D Foundation ModelsPeter T. Shaffner, Joseph T. Kottenstette, Jerry Wright and Rebecca Heisler,Bureau of Reclamation

Evaluation of Shear Strength of Mélange Foundation at Calaveras DamJohn W. Roadifer and Michael P. Forrest, URS Corporation; and EricLindquist, Berti-Lindquist Consulting Engineers, Inc.

Auxiliary Spillway Rock Cut Stability, Lake Fort Smith DamChristopher Groves and Scott Garbs, Shannon & Wilson

3:00 p.m. - 3:30 p.m. Break in Exhibit Hall

3:30 p.m. - 5:30 p.m. Concurrent Session 2A — Concrete Dams II

Moderators — Michael F. Rogers, MWH; and William R. Fiedler, Bureau of

Reclamation

RCC Trends in Early 21st Century Dams in the U.S.Fares Y. Abdo, Portland Cement Association

Staged Construction Thermal Analysis for San Vicente Dam Raise ProjectBashar Sudah, Vik Iso-Ahola and Glenn Tarbox, MWH Americas, Inc.

RCC Construction Issues at the New Upper Reservoir Taum Sauk Pump StorageProjectLuis Gaekel, Charles Weatherford and John P. Osterle, Paul C. RizzoAssociates; and Tom Hollenkamp, AmerenUE

Portugues Dam Roller Compacted Concrete Mix Design and Testing ProgramJames Mangold, David A. Dollar and James K. Hinds, Corps of Engineers

3:30 p.m. - 5:30 p.m. Concurrent Session 2B — Hydrology andHydraulics II

Moderators — Jerry W. Webb, Corps of Engineers; and James E. Lindell,

MWH

Scour Upstream of Dam PiersAmanda Sutter, Michael P. Navin and Travis Tutka, Corps of Engineers

Monte Carlo Simulation for Reliability Estimation of Plunge Pools Downstream ofa Ski-Jump Bucket Spillway of Large DamsG. Shams Ghahfarokhi, P.H.A.J.M van Gelder and H. Vrijling, Delft Universityof Technology

Integration of Water Management into Risk Reduction at Bluestone Dam: A CaseStudyJames Schray and Theresa Dawson, Corps of Engineers

Upgrading Your Dam — Preparedness Planning for Spartanburg Water’s LakeBlalock DamRobert Osborne, Randy Boyce and Greg Zamensky, Black & VeatchCorporation; Aled Hughes, formerly Black & Veatch Corporation; and RogerRhodes and Ken Tuck, Spartanburg Water

3:30 p.m.- 5:30 p.m. Concurrent Session 2C — Embankment Dams I

Moderators — B. Alex Grenoble, Devine Tarbell & Associates, Inc.; and

Manoshree Sundaram, Federal Energy Regulatory Commission

Investigations of Seepage Concerns at Keystone Dam, OKD. Wade Anderson, Randel Mead and James McHenry, Corps of Engineers

Optimizing the Placement of Grout Curtains: A Minimally Invasive Approach atClearwater DamVal Kofoed, Willowstick Technologies

Herbert Hoover Dike Rehabilitation: Seepage Design Concepts and ChallengesJacob Davis, Erich Guy and Ron Nettles, Corps of Engineers

Comprehensive Foundation Rehabilitation at TVA Bear Creek DamConrad Ginther and John E. Charlton, Paul C. Rizzo Associates

3:30 p.m. - 5:30 p.m. Concurrent Session 2D — Rock Mechanics II

Moderators — John W. France, URS Corporation; and Terrence E. Arnold,

MWH

Risk Evaluation of Dams on Karst FoundationsJeffrey A. Schaefer, Corps of Engineers

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Dams on Carbonate Foundations in the United StatesArthur H. Walz Jr. and David B. Wilson, Gannett Fleming Inc.,

Characterization of Geologic Features Affecting Seepage through CarbonateDam FoundationsMichael A. Knight and William M. Roman, Gannett Fleming, Inc.

Design, Construction and Performance of Seepage Barriers for Dams onCarbonate FoundationsDonald A. Bruce, Geosystems, L.P.; and Trent L. Dreese and David B. Wilson,Gannett Fleming, Inc.

5:30 p.m.- 7:30 p.m. Poster Session, Exhibition and Reception

Outlet Tunnel Slab Damage at Seven Oaks DamChris Bahner, WEST Consultants, Inc.

Challenges and Opportunities in Rehabilitating and Enlarging a 100-Year-OldOn-Channel ReservoirMatthew Bliss, Steve Whiteside and Kelly DiNatale, CDM; Travis Smith, SanLuis Valley Irrigation District; and Don Deere, Deere and Ault

Seismic Input Motion Uncertainty and Safety of Embankment DamsGilles Bureau, William A. Rettberg and Steve Verigin, GEI Consultants, Inc.

Multi-Use of a Rehabilitated Reservoir for Improved River Administration, FloodControl, Agricultural, Domestic, Environmental and Recreational BenefitsKelly DiNatale and Matthew Bliss, CDM; and Travis Smith, San Luis ValleyIrrigation District

Industry Leading Satellite-Based GPS/GNSS (Global Navigation SatelliteSystem) Positioning and Monitoring Solutions for Dam, Reservoir and LeveeManagementPaul Drummond, Trimble Navigation Ltd.

Risk Analysis for Shasta Dam RaiseThomas E. Hepler, Bill Fiedler and John LaBoon, Bureau of Reclamation

Carter Lake Dam Outlet Works AdditionJohn W. France and Michael T. Zusi, URS Corporation; and Carl Brouwer,Northern Colorado Water Conservancy District

Enhancing Dam Safety at the US Military AcademyMarty Goff and Bruce Rogers, Corps of Engineers

Inverse Calculation of Shear Wave Velocity of Rockfill Zone UsingMicroearthquake RecordsIk-Soo Ha and Byung-Hyun Oh, Korea Water Resources Corporation

Seepage, Rock Stability & Bank Stabilization, Abiquiu Dam and Reservoir, RioChama, New MexicoSuzanne R. Hess-Brittelle, Corps of Engineers

Strength and Stability Evaluation of the Hinze Dam Lower Intake TowerScott L. Jones, Brad Dawson and David Hughes, URS Corporation

Fragility Assessment of Concrete Gravity Dams Based on Nonlinear DynamicTime History AnalysisSoha Mirzahossein Kashani and Mohsen Ghaemian, Sharif University ofTechnology

Environmentally Considerate Lubricants for DamsPatrick Laemmle and Peter Rohrbach; PANOLIN AG

Pillager Hydro Electric Station — Spillway Stabilization ProjectWayne Lozinski, Acres Manitoba Limited; S. Neil Ferguson, Hatch Ltd.; andDavid L. Aspie, Minnesota Power

Control System Cyber Security Self-Assessment Tool (Cs2sat)Seán Paul McGurk, U.S. Department of Homeland Security

Rehabilitation of Marmet Dam - Condition Assessment Based Evaluation of Riskand ReliabilityChirag D. Mehta and Perry R. Cole, INCA Engineers, Inc.

Biological Indicators of Conditions Below Dams in the Western United StatesS. Mark Nelson, Bureau of Reclamation

Experimental Examination of the Effect of Particle Size in Hydraulic TurbinesHari Prasad Neopane and Ole Gunnar Dahlhaug, Norwegian University ofScience & Technology; and Bhola Thapa, Kathmandu University

Potential Failure Modes of the Truckee Canal Failure at Fernley, NevadaDave Paul, Bureau of Reclamation

The (Cost, Time, …) Benefits of Using CFD Hydraulic Models for Various DamProjectsMike Phillips and Frank Lan, URS Corporation

The Effect of Earthquakes on Cracked Concrete Gravity DamsSogol Sadeghian and Mohsen Ghaemian, Sharif University of Technology

Interrelated Processes that Affect Levee Stability along Navigable RiversMike Spoor, Seth Lyle and Adam Kays, Corps of Engineers

Consequence Ratings for BIA (Bureau of Indian Affairs) Dams — A StreamlinedMethod for Developing Potential Loss of Life Estimates Relative to Possible DamFailureJay Stateler, Bureau of Reclamation; John Anevski and Doug Oellermann,Bureau of Indian Affairs; and Mike Brown, Confederated Salish and KootenaiTribes

Leakage from a Drinking Water Reservoir — How Much Is Too Much?Steve Whiteside and Sergio Gaitan, CDM

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Designing a New Dam at a Karst Geology SiteSteve Whiteside and Kirk Westphal, CDM

Development of Information Sharing Processes for the Dams SectorNancy Wong and Carlos Kizzee, U.S. Department of Homeland Security

Thermographic Imaging of Voids Behind Conduits and DrainsJ.W. Wright, J.R. Smith, N. Myers, C. Cooper, J. Jones and R. Becker,Bureau of Reclamation

Effect of Seismicity on Subsurface Erosion in LeveesMing Xiao and Jose Gomez, California State University, Fresno

Wednesday, April 22

7:00 a.m. - 5:30 p.m. Registration

7:00 a.m. - 8:00 a.m. Continental Breakfast in Exhibit Hall

8:00 - 10:00 a.m. Concurrent Session 3A — Construction I

Moderators — Arturo Ressi-di-Cervia, Kiewit Construction Company; and

Victor Vasquez, Freese and Nichols, Inc.

Developing Accurate Engineer’s EstimatesDan Hertel, Barnard Construction Company, Inc.; and Roy Watts, URSCorporation

Mormon Island Auxiliary Dam — Assessing Construction Risks for SeismicRemediation AlternativesM. Jonathan Harris and Gregg A. Scott, Bureau of Reclamation

Rehabilitation of the Diversion Tunnel Outlet Works at Cobble MountainReservoir DamNeill J. Hampton, Camp Dresser & McKee, Inc.; and James Constantino,Springfield Water & Sewer Commission

Lake Sherburne Dam Outlet Works RehabilitationTom Scobell and Dave Paul, Bureau of Reclamation

8:00 a.m. - 10:00 a.m. Concurrent Session 3B — Risk I

Moderators — Donald L. Basham, Stantec Consulting Services; and Enrique E.

Matheu, U.S. Department of Homeland Security

A Structured Approach to Incorporating Uncertainty into a Dam Safety RiskAssessmentDavid S. Bowles, Sanjay S. Chauhan, Loren R. Anderson and Terry F.Glover, Utah State University and RAC Engineers & Economists

Developing Tolerable Risk Guidelines for the US Army Corps of Engineers Damsin Collaboration with Other Federal AgenciesDale F. Munger, Corps of Engineers; David S. Bowles, Utah State Universityand RAC Engineers & Economists; Douglas D. Boyer, Federal EnergyRegulatory Commission; Darryl W. Davis, David A. Margo and David A. Moser,Corps of Engineers; Patrick J. Regan, Federal Energy Regulatory Commission;and Nathan Snorteland, Bureau of Reclamation

Comparison of Methods Used for Estimating Loss of Life Resulting from DamFailureWayne Graham, Bureau of Reclamation

Probabilistic Safety Analysis for Evaluation of Stability of Spillway of Large DamG. Shams Ghahfarokhi, P.H.A.J.M van Gelder and J.K. Vrijling, DelftUniversity of Technology

8:00 a.m. - 10:00 a.m. Concurrent Session 3C — Embankment Dams II

Moderators — B. Alex Grenoble, Devine Tarbell & Associates, Inc.; and

Manoshree Sundaram, Federal Energy Regulatory Commission

Internal Erosion Incidents at Bureau of Reclamation DamsWilliam O. Engemoen and Charles G. Redlinger, Bureau of Reclamation

The Long Term Performance of Seepage Barriers in Dams — A Summary ofFindings from Case Histories and AnalysesJohn D. Rice, Utah State University

3D GeoStatistics to Evaluate Embankment and Foundation SeepageKenneth R. Pattermann, Corps of Engineers

Using Geophysics to Evaluate an Embankment Dam SinkholeMike McCaffrey, PB Power; Phil Sirles, Zonge Geosciences, Inc.; Bill Black,Norcal Geophysical, Inc.; Paul Shiers, PB Power; and Ray Barham, AlcoaPower Generation Inc.

8:00 a.m. - 10:00 a.m. Concurrent Session 3D — Environmental Issues I

Moderators — Patrick Mangan, Bureau of Reclamation; and Kenneth A.

Steele, Consultant

Cuyahoga River Restoration Project: Balancing History and EnvironmentTed Johnson and Greg Schell, CDM; and Robert Brown, City of Kent, Ohio

The Design of Flood Control Dam with Eco-corridor (Hantangang Dam in Korea)Un Il Baek, Daelim Industrial Co., Ltd; Wan Ho Lee, Korea Water ResourcesCorporation; and Tae Myoung Jeon, Daelim Industrial Co., Ltd

Hiding in Plain Sight — Using the Natural Landscape to Provide a Visual Barrierin Large Dam ConstructionAndrew Aceves and Melissa L. Dubinsky, Paul C. Rizzo Associates, Inc.

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Truckee River Below Derby Dam Restoration ProjectMitch Blum, HDR

10:00 a.m. - 10:30 a.m Break in Exhibit Hall

10:30 a.m. - 12:00 noon Concurrent Session 4A — Construction II

Moderators — Arturo Ressi-di-Cervia, Kiewit Construction Company; and

Victor Vasquez, Freese and Nichols, Inc.

Design and Construction Methods of a Rockfill Cofferdam through 200 Feet ofWaterMark Pabst, Bureau of Reclamation

A.V. Watkins Dam Modification: Cement-Bentonite Cutoff WallBrandt Demars, Curt Pledger and Bruce Barrett, Bureau of Reclamation

Otter Rapids Seepage Control and Piping RemediationIván A. Contreras, Rich H. Ver Strate and William J. Forsmark, BarrEngineering Company; and Todd Poehlman, Wisconsin Public ServiceCorporation

10:30 a.m. - 12:00 noon Concurrent Session 4B — Risk II

Moderators — Donald L. Basham, Stantec Consulting Services; and Enrique E.

Matheu, U.S. Department of Homeland Security

Dam Failure Analysis and Consequence Estimation Using a Scalable ApproachDavid Margo, John Hunter and Jason Needham, Corps of Engineers

Managing Dam Safety Risk Through an Emergency Action Plan Joint FunctionalExerciseShirley Williamson and Jason Paolino, PB Power; Mark Gross, Alcoa PowerGeneration Inc.; and John Lyon, Federal Energy Regulatory Commission

Emergency Action Planning Resource Tool Utilizing Non-Structural RiskReduction MeasuresJeffrey Racicot, Federal Energy Regulatory Commission

10:30 a.m. - 12:00 noon Concurrent Session 4C — Embankment Dams III

Moderators — Del A. Shannon, Black & Veatch Corporation; and Danny

McCook, Consultant

Re-Evaluation of the Seismic Stability of Chabot DamLelio H. Mejia, Jiaer Wu and Theodore B. Feldsher, URS Corporation; andAtta B. Yiadom, East Bay Municipal Utility District

Use of Dynamic Deformation Analysis in Remediation Design / Comparison ofLiquefaction Triggering Analysis Approaches for an Embankment Dam andFoundationMichael Ruthford, David Serafini and Vlad Perlea, Corps of Engineers / DavidC. Serafini and Vlad Perlea, Corps of Engineers

Re-Analysis of the Failure of Teton DamGeraldo R. Iglesia and James L. Stiady, G

2D Resources, LLC; and Jim Zhou,

San Diego County Water Authority

10:30 a.m. - 12:00 noon Concurrent Session 4D — Environmental Issues II

Moderators — Patrick Mangan, Bureau of Reclamation; and Kenneth A.

Steele, Consultant

Getting Past the Politics to Deliver WaterGary Robertson, Western Virginia Water Authority; and John Wilkes, CARPIUSA

Approach to Management of Risks on the San Vicente Dam Raise and CarryoverStorage ProjectKelly L. Rodgers, San Diego County Water Authority; Geraldo R. Iglesia, G

2D

Resources, LLC; and Thomas O. Keller, GEI Consultants, Inc.

Asset Management — A New Way of Doing BusinessCory Morgan, Corps of Engineers

12:00 noon - 1:15 p.m. Lunch

Moderator — Kenneth A. Steele

Speaker — To be announced

1:30 p.m. - 3:00 p.m. Concurrent Session 5A — Monitoring

Moderators — James Hummert, URS Corporation; and Jay N. Stateler, Bureau

of Reclamation

Implementation and Management of a Successful GIS for the FERC RelicensingProcess — Lessons LearnedKareem Bynoe, Paul Shiers and Anthony Plizga, PB Power; and MarshallOlson, Alcoa Power Generation Inc.

Using GIS to Enhance Dam Failure Inundation MapsBarry Moran, John Hunter and David Margo, Corps of Engineers

Evaluating GNSS Monitoring Options in a Real-Time Network EnvironmentGavin Schrock, Seattle Public Utilities

1:30 p.m. - 3:00 p.m. Concurrent Session 5B — Security I

Moderators — Tom Pace, Stantec Consulting, Inc.; and John C. Lyon, Jr.,

Federal Energy Regulatory Commission

An European Methodology for Risk Based Security Assessment of Dams(DAMSE): Checking Screening Outcomes with DHS ProceduresIgnacio Escuder, Universidad Politecnica de Valencia; Massimo Meghella,Cesi Ricerca; Manuel G. Membrillera, Universidad Politecnica de Valencia; andEnrique E. Matheu, U.S. Department of Homeland Security

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Consequence-Based Top Screen Methodology for Dams / Development of aConsequence-Based Screening Methodology for LeveesEnrique E. Matheu, U.S. Department of Homeland Security; Frank Calcagno,Federal Energy Regulatory Commission; and Hal Dalson, Consumers Energy /Jennifer Dunn, Corps of Engineers; and Enrique E. Matheu, U.S. Department ofHomeland Security

A Comparative Study on Risk Assessment Methodologies for Security andProtection of Critical InfrastructureYazmin Seda-Sanabria, Corps of Engineers; Ed Jopeck, SRA International,Inc.; and Enrique E. Matheu, U.S. Department of Homeland Security

1:30 p.m. - 3:00 p.m. Concurrent Session 5C — Levees I

Moderators — Peter Hradilek, HDR Engineering, Inc.; and Elena Sossenkina,

Kleinfelder, Inc.

Levee Screening Risk AssessmentDavid Margo, Andy Harkness, Jason Needham, David Schaaf, Rick Schultzand Jeffrey Schaefer, Corps of Engineers

Reliability Evaluation of the Natomas Levee System as Part of the SacramentoRiver Flood Control Project, Sacramento, CaliforniaEdward Ketchum and Mary Perlea, Corps of Engineers; and Raymond Costa,Consultant

Simplified Approach to Assess Levee Seismic VulnerabilityScott Shewbridge and Sujan Punyamurthula, URS Corporation; MikeInamine, California Department of Water Resources; Juan Vargas, URSCorporation; Steve Mahnke, California Department of Water Resources; andJerry Wu, URS Corporation

1:30 p.m. - 3:00 p.m. Concurrent Session 5D — Environmental Issues III

Moderators — Jeffrey A. Shoaf, San Diego County Water Authority; and

W. Robert Ivarson, Jr., HNTB Corporation

Management Implications when Reservoir Drawdown Zones become occupiedby an Endangered SpeciesDarrell Ahlers, Bureau of Reclamation

Fish Habitat Mitigation and Restoration Challenges Associated with AdditionalWater Storage at Howard Hanson DamLisa Scott and Zac Corum, Corps of Engineers

Application of Stochastic Time Series Modeling for Incorporation of IncreasedVariability of Flow in the Development of Instream Flow RecommendationsThomas Hardy, Ekaterina Saraeva and Lisa Jensen, Utah State University

3:00 p.m. - 3:30 p.m Break in Exhibit Hall

3:30 p.m. - 5:00 p.m. Concurrent Session 6A — Hydraulic Structures

Moderators — David E. Meadows, Corps of Engineers; and Samuel L. Hui,

Bechtel Corporation

Fitness for Service Evaluation Procedures for Hydraulic Steel StructuresThomas North, Corps of Engineers

Cost Effective Modification of Flood Release Gates for License ComplianceStefan Schadinger and Anthony Plizga, PB Power; Ray Barham, Alcoa PowerGeneration Inc.; and John Lyon, Federal Energy Regulatory Commission

Replacement of the Low-Level Outlet Control at San Pablo DamSean M. Todaro and Ray G. Wong, East Bay Municipal Utility District

Design for the Lake Townsend Dam Replacement ProjectRobert Cannon, Rick Lux, Gerald Robblee, Tillman Marshall and GregPaxson, Schnabel Engineering; and Melinda King, City of Greensboro, NorthCarolina

3:30 p.m. - 5:30 p.m. Concurrent Session 6B — Security II

Moderators — Tom Pace, Stantec Consulting, Inc.; and John C. Lyon, Jr.,

Federal Energy Regulatory Commission

USACE-DHS Collaborative Efforts on Risk Assessment and Blast Mitigation forDamsMichael K. Sharp and Yazmin Seda-Sanabria, Corps of Engineers; andEnrique E. Matheu, U.S. Department of Homeland Security

Methodology for Estimating Economic Consequences from a Dam FailureDawn Munger, Bureau of Reclamation

Application of the Homeland Security Exercise and Evaluation Program (HSEEP)Framework to the 2008 Dam Security Exercise Series (DSES-08)Yazmin Seda-Sanabria, Corps of Engineers; and Douglas J. Norton, BattelleMemorial Institute

Expanding the Base of Security Information Among Dam and Levee Owners andOperatorsAl Hancock, Xcel Energy Corporation; and John Moyle, New JerseyDepartment of Environmental Protection

3:30 p.m. - 5:00 p.m. Concurrent Session 6C — Levees II

Moderators — Peter Hradilek, HDR Engineering, Inc.; and Elena Sossenkina,

Kleinfelder, Inc.

Probable Failure Mode for June 2008 V-Line Canal FailureChristopher Slaven and Richard LaFond, Bureau of Reclamation

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Geotechnical Assessment of Indiana Dams and Levees during June 2008Midwest Flood EventGreg Hensley, Sean Carter, Erich Guy, Steven Spagna and Troy S. O’Neal,Corps of Engineers

Laurel Ridge Levee Improvements and Extension Ascension Parish, LouisianaMohammad Tavassoli, Michael Bachand and Steve Whiteside, CDM

Cut-Offs for Levees and Dams: A Technology ReviewDonald A. Bruce, Geosystems, L.P.; and George Sills, GeotechnicalEngineering Consultant

3:30 p.m. - 5:00 p.m. Concurrent Session 6D — Environmental Issues IV

Moderators — Jeffrey A. Shoaf, San Diego County Water Authority; and

W. Robert Ivarson, Jr., HNTB Corporation

Incorporating Water Bodies into a Post-Mining LandscapeJeffery Schubert, Paul C. Rizzo Associates, Inc.

Impacts and Response to the Quagga Mussel Invasion of the Colorado RiverAqueduct of Southern CaliforniaWilliam D. Taylor, Metropolitan Water District of Southern California

Sampling and Detection of Dreissena Species: Determining if Zebra or QuaggaMussels are in your WaterDenise M. Hosler, Bureau of Reclamation

Effects of Jet Grouting on Wetland Invertebrates at Morman Island Auxiliary Dam,Folsom, CaliforniaGregory Reed and S. Mark Nelson, Bureau of Reclamation

7:00 p.m. - 7:45 p.m. Reception

7:45 p.m. - 10:00 p.m. Dinner with Speaker and USSD AwardPresentations

Moderator — Kenneth A. Steele

Speaker — To be announced

Thursday, April 23

7:00 a.m. - 8:00 a.m. Workshop Registration

8:00 a.m. - 5:00 p.m. Risk Workshop

8:00 a.m. - 5:00 p.m. Seismic Workshop

8:00 a.m. - 10:00 a.m. Technical Session — Wolf Creek Dam

Moderator — Barney Davis, Corps of Engineers

The Problem is the Solution: A History of Seepage, Piping, and Remediation in aKarst Foundation at Wolf Creek Dam — Jamestown, KentuckyMichael F. Zoccola, Tommy A. Haskins and Daphne M. Jackson, Corps ofEngineers

The Evolution of Instrumentation and Monitoring at Wolf Creek Dam Focusing onPotential Failure ModesJocelyn Feliciano, Corps of Engineers

Mapping Techniques for Communicating Risk and Potential Consequences ofDam Failure at Wolf Creek and Center Hill DamsBenjamin L. Rohrbach and Barry P. Moran, Corps of Engineers

Turning Data into Information at Wolf Creek DamL. Benneyworth, David Green, Jeff Albee and Bill Spencer, AMEC Earth &Environmental, Inc.; and Mark Elson, Tommy Haskins and Mike Zoccola,

Corps of Engineers

Impacts of Pool Restrictions on Operation of the Cumberland River BasinReservoir SystemRobert B. Sneed, Corps of Engineers

Emergency Action Planning and Coordination for Wolf Creek DamKyle Hayworth, Corps of Engineers

10:00 a.m. - 10:30 a.m Break

10:30 a.m. - 5:00 p.m. Field Tour — Center Hill Dam

Friday, April 24

8:00 a.m. - 6:00 p.m. Field Tour — Wolf Creek Dam(Revised October 6, 2008)

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2009 USSD Conference

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HEADINGS Following are the formats of the three levels of headings. Note: headings should not be numbered. First Degree Headings should be in all capital letters, bold, centered. One blank line before and after heading. (Suggested First Degree Headings are: Abstract, Introduction, two or three major technical sections, Summary and References.) Second Degree Headings have initial caps (title case), begin at left margin, bold and underlined. One blank line before and after heading. Third Degree Headings begin at left margin, with initial caps, underlined (not bold), colon, begin text on same line (one blank line before the heading). FIGURES, TABLES AND EQUATIONS Figures and Photographs — All figures and photographs should be electronic images inserted into the document. They should appear within the main text as soon after the initial reference as possible. Figures and photographs may be in color. All figures and photographs must fit within the same margins as the text. Place the caption (12 point Times New Roman) below the illustration, centered, as follows:

Figure 4. Effect of Rainfall Intensity on Friction Factor Tables — Should appear within the main text as soon after the initial reference as possible. All tables must fit within the same margins as the text. Place the caption (12 point Times New Roman) above the table, centered, as follows:

Table 4. Rainfall Intensity Equations — Place one blank line between text and equation, and center equation on page. Number equations consecutively. Equation number should be in parentheses and flush right (ending at right margin). SUBMITTING YOUR PAPER DRAFT — Send by e-mail to stephens@ussdams.org, for forwarding to the Session Moderators for review. The reviewers will send comments directly to you by e-mail. FINAL — mail the Word .doc file on a disk or CD AND a hard copy of the paper to USSD at the following address. Please do not send your final manuscript by e-mail. Because there are differences in computers, software and printers, what you see on your computer screen and on your printed version is not always what we see. (This can be problem for equations and graphics, especially.) Having a CD with the file and a hard copy helps us ensure that your paper appears in the Proceedings as you wish to see it.

Larry D. Stephens U.S. Society on Dams Phone: 303-628-5430 1616 Seventeenth Street, #483 Fax: 303-628-5431 Denver, CO 80202 E-mail: stephens@ussdams.org.

FIRST DEGREE HEADING Second Degree Heading Third Degree Heading:

RESIDUAL SHEAR STRENGTH OF LIQUEFIED SOILS

I. M. Idriss1

Ross W. Boulanger 2

ABSTRACT

An evaluation of post-earthquake static stability for embankment dams that contain, orare founded on, soils that may liquefy requires estimating the liquefied soil's residualshear strength, Sr. Decisions regarding the need for expensive mitigation efforts,including ground improvement work, often hinge on the selected Sr values. This paperpresents recommended relationships for estimating the residual shear strength ratio,Sr/'vo, of liquefied nonplastic soils in the field based on a review of prior case historystudies, laboratory testing studies, and recent findings regarding void redistributionmechanisms. The recommended relationships provide guidance regarding theunavoidable task in practice of having to extrapolate beyond the available case historydata. Limitations in the state of knowledge are discussed.

INTRODUCTION

Procedures for estimating the residual shear strength, Sr, of liquefied cohesionless ornonplastic soils have evolved considerably over the past 25 years. Procedures thatrequire laboratory testing of field samples have been developed that use samples obtainedby frozen sampling techniques (e.g., Robertson et al. 2000) or samples obtained by high-quality tube sampling techniques coupled with procedures for "correcting" the shearstrength for the estimated volume changes that occur during sampling and testing (e.g.,Castro 1975, Castro and Poulos 1977, Poulos et al. 1985). Case history based proceduresfor estimating the in situ Sr of liquefied soils have been developed by back-analyses ofliquefaction flow slides, as first presented by Seed (1987) and since modified by anumber of investigators (e.g., Seed and Harder 1990, Ishihara 1993, Wride et al. 1999,Olson and Stark 2002).

Whitman (1985) described situations where pore water seepage driven by earthquake-induced excess pore water pressure gradients could lead to the localized loosening of theliquefied soil, or "void redistribution", that could result in Sr being much lower in thefield than would be obtained from laboratory tests of samples at the pre-earthquake voidratio. These situations require the presence of a soil layer of significantly lowerpermeability overlying the liquefied soil layer, thereby impeding the outward seepage, asillustrated for an infinite slope in Figure 1. Physical and analytical modeling studies byKokusho (2000), Kulasingam et al. (2004), and Malvick et al. (2004) have illustrated thevoid redistribution phenomena and evaluated several factors that significantly affect it.

1 Professor Emeritus, Department of Civil & Environmental Engineering, University of California, Davis,CA 95616, imidriss@aol.com2 Professor, Department of Civil & Environmental Engineering, University of California, Davis, CA 95616,rwboulanger@ucdavis.edu