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SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011HEC-23Countermeasure Designg for Bridgeg Scour& Stream InstabilityLarry ALArneson, Ph.D.,Ph D P.E.,PE DD.WREWREFHWA Resource Center,, Lakewood,, COSeventeenth Statewide Conference on Local BridgesSyracuse , New York October 25 – 27, 2011STRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011Whyy Are Scour CountermeasuresImportant?New York State – 12005 NBIS Bridges(2010)Number IHS Scour CriticalNumber NHS Scour CriticalNumber NNHS Scour CriticalTotal% ICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011Stream Stability AnimationBridge Scour AnimationSTRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011Presentation Outline: HEC-23HEC 23 - IntroductionId i andd OverviewOi New Design Guidelines for Pier Scour &Streambank Revetment New Filter Design – Necessary, But OftenOverlookedSTRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011HEC-23, Bridge Scour and Stream InstabilityCountermeasures - Experience, Selection, &Design GuidanceThird Edition (September 2009)Volume 1Chapters 1-9,1 9 References,References and Four AppendicesVolume 2Ni tNineteenDDesigni GGuidelinesid liiin SiSix SSectionstiSTRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011Volume 1 Expanded guidance on development of Plansof Action (POA) for scour critical bridgespcountermeasure selection matrix Updated Updated chapter on riprap design, filters,failure modes,, and alternatives A new chapter on biotechnical engineeringpon scour monitoringg and Revised ICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011Volume 2 Countermeasures for Stream Instability Countermeasures for Streambank andRoadway Embankment Protection Countermeasures for Bridge Pier Protection Countermeasures for Abutment Protection Filter Design Special ApplicationsSTRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011Section 1 – Stream Instability DG 1 – Bendway Weirs / Stream Barbs DG 2 – Spurs DG 3 – Check Dams/Drop Structures*DesignDesign Workshop Available in NHI Course 135048STRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011Section 2 – Streambank Protection DG 4 – Riprap Revetment DG 5 – Riprap Design for EmbankmentOvertopping DG 6 - Wire Enclosed Riprap Mattress DG 7 – Soil Cement DG 8 – Articulatingg Concrete Block Systemsy DG 9 – Grout-Filled Mattresses DG 10 – Gabion Mattresses*Design Workshop Available in NHI Course 135048STRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011Section 3 – Bridge Pier Protection DG 8 – ACB SSystems at BBridgeid PiPiers DG 9 – Grout-Filled Mattresses at Bridge Piers DG 10 – GabionG bi MMattressesttatt BBridgeid PiPiers DG 11 – Rock Riprap at Bridge Piers DG 12 – Partially Grouted Riprap at BridgePiers*Design Workshop Available in NHI Course 135048STRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011Section 4 – Abutment Protection DG 13 – Grout/Cement Filled Bags DG 14 – Rock Riprap at Bridge Abutments DG 15 – Guide BanksSection 5 – Filter Design DG 16 – Filter Design*Design Workshop Available in NHI Course 135048STRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011S ti 6 – SpecialSectionSi lAApplicationsli ti DG 17 – Riprap Design for Wave Attack DG 18 – Riprap Protection for Bottomless Culverts DG 19 – Concrete Armor Units* DesigngWorkshopp available in NHI course 135048STRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011Th CountermeasuresTheCtMatrixM t iGroup 1 – Hydraulic CountermeasuresGroup 2 – Structural CountermeasuresGroup 3 – Biotechnical CountermeasuresGroup 4 – Monitoring* HEC-23, Volume 1, Chapter 2STRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011CCountermeasuretChCharacteristicst i ti Functional Applications Suitable River Environment Maintenance Installation/Experience by State Design Guidelines ReferenceSTRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011STRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011STRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011QQuestionstiThThe MMatrixt i Will AAnswer: What typeyp of problempis the countermeasure for? What type of river environment is thecountermeasure suitable for—or where will it notperform well? What level of resources will need to be planned formaintenance? What states or regions of the US have experiencewith this countermeasure? Where do I obtain design guidance?STRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011DesignDi GGuidelineid li 1212:Partially Grouted RiprapSTRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011PARTIALLY GROUTED RIPRAPSTRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011PARTIALLY GROUTED RIPRAPSTRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011PARTIALLY GROUTED RIPRAPSTRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011PARTIALLY GROUTED RIPRAPPierPartially groutedriprap placed flushwith channel bedFLOWSand-filledgeotextilecontainersMinimum armor thickness t 2d50 , depth ofcontraction scour, or depth of bedform trough,whichever is greatestFilter placement 1.0(a) from pier (all around)STRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011GROUT QA/QC IS IMPORTANTSTRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011GROUT QA/QC IS IMPORTANTSTRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011ROCK SIZE . . . . NO EQUATION !Table 12.1. Size Gradations for Ten Standard Classes of Riprap.Nominal RiprapClass by MedianParticle xI6 in3.75.25.76.97.89.212.0IIIIIIV9 in12 in15 5.519.514.018.523.018.024.030.0V18 in11.015.517.020.523.527.536.0VI21 in13.018.520.024.027.532.542.0VII24 in14.521.023.027.531.037.048.0VIII30 in18.526.028.534.539.046.060.0IX36 in22.031.534.041.547.055.572.0X42 in25.536.540.048.554.564.584.0Note: Only Classes II, III, and IV are suitable for use in partial grouting applications.STRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011PLACING IN FLOWING WATERSTRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011PLACING IN FLOWING WATERpH vs. Time10 510.510.09.5pH (pH me (seconds)Probe ASTRUCTURESProbe BProbe CProbe DHYDRAULICSProbe EProbe FProbe GGEOTECHNICAL14:15

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011TESTING AT PROTOTYPE SCALESTRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011TESTING AT PROTOTYPE SCALEPierDisplaced rockScourholeSh lSTRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011Thi d EditionThirdEditi - PrimaryP iSSources forf ChChanges NCHRP Reportp544 – Environmentallyy Sensitive Channeland Bank Protection NCHRP Report 568 – Riprap Design Criteria,Recommended Specifications,Specifications and Quality Control NCHRP 593 – Countermeasures to Protect Bridge Piersfrom Scour FHWA Reports FHWA-RD-02-078 and HRT-07-026STRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011Learning Assessment Question #1Question: Why are countermeasuresimportant for scour critical bridges?Answer: To protect the traveling publicand remove them from the statesinventory of scour critical bridgesSTRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011Learning Assessment Question #2What QQuestions Will The ScourCountermeasure Matrix Answer? What type of problem the countermeasure for? Y/N What type of river environment is the countermeasuresuitable for—or where will it not pperform well? Y/N What level of resources will need to be planned formaintenance? Y/N What states or regions of the US have experience withthis countermeasure? Y/N Where to obtain design guidance? Y/NSTRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011Learning Assessment Question #3Question: Why is the Design Of ScourCountermeasures So Important?Answer: Because all Scour Critical Bridges andg With Unknown Foundations RequireqaBridgesPlan Of Action and Short of Replacement, agCountermeasure is the Onlyy Wayy toDesignedMake a Scour Critical Bridge a Non ScourgCritical Bridge.STRUCTURESHYDRAULICSGEOTECHNICAL

SeventeenthStatewide Conference on Local BridgeHydraulic Engineering CircularNo. 23Syracuse , New York October 25 – 27, 2011Learning Assessment Question #4Question: Where do I obtain designguidance for designing scourcountermeasures at bridges?Answer: HEC-23STRUCTURESHYDRAULICSGEOTECHNICAL