WinDAM B Earthen Embankment Overtopping Analysis Software
WinDAM B Earthen Embankment Overtopping Analysis Software
WinDAM B Earthen Embankment Overtopping Analysis Software
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<strong>WinDAM</strong> B <strong>Earthen</strong><strong>Embankment</strong> <strong>Overtopping</strong><strong>Analysis</strong> <strong>Software</strong>Karl Visser, PEHydraulic EngineerFort Worth, TXNatural Resources Conservation ServiceNat’l Design Construction & Soil Mechanics Center
Co-AuthorsARS – Stillwater, OK• Dr. Gregory Hanson, Retired• Dr. Darrel Temple, Retired• Ronald Tejral, Ag EngineerKSU – Manhattan, KS• Dr. Mitchell NeilsenFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 2
What does <strong>WinDAM</strong> Bdo?Why would I use it?
<strong>WinDAM</strong> B Capability• Hydraulics• Route 1 hydrograph through 1 dam• Estimate erosion• 1-3 earth or vegetated aux spillways• <strong>Overtopping</strong> erosion of earthenembankmentFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 5
<strong>Overtopping</strong> Erosion• <strong>Earthen</strong> embankment• Homogenous fill, not zoned• Slope protection• Bare soil• Grass• RiprapFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 6
Hydrology• User-supplied hydrograph• 1 input hydrograph per runFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 7
Hydraulics• 1 hydrograph routed• 1 dam• Principal spwy• Aux spwys (veg or earth)• <strong>Overtopping</strong>Feb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 8
Tailwater Rating TableTailwater f(Outflow)Tailwater f(Outflow)Feb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 9
Aux Spillway Erosion• 0, 1, 2, or 3 auxiliary spillways• Vegetated or earthenDamFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 10
<strong>WinDAM</strong> Versions<strong>WinDAM</strong> A+<strong>WinDAM</strong> B<strong>WinDAM</strong> C(proposed)<strong>WinDAM</strong> D(proposed)<strong>WinDAM</strong> E(proposed)<strong>Overtopping</strong> analysis(Slope protection evaluation)Homogenous embankmentovertopping & erosion analysisInternal erosion (piping)homogenous fill embankmentPotential failure initiation @ toe/berms/groinsAlternative embankment slope protection(ACB’s, reinforced vegetation)Zoned fill embankment overtopping erosionFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 11
Erosion & HydraulicsAuxiliary SpillwayEstimates 2D erosionof weakest unit widthAux spillway flowunaffected by erosionHydraulics & aux spwyerosion – not coupled<strong>Embankment</strong><strong>Overtopping</strong>Estimates 3D erosion ofhomogenous earthfillLateral widening &deepening headcuterosion increases outflowHydraulics & embankmenterosion coupledFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 12
Aux Spwy Erosion -2D EstimateGeologic materials,naturally formed &weathered, variedUnit WidthAug 2012 <strong>WinDAM</strong> B Purpose & Policy 13
<strong>Embankment</strong> Erosion -3D EstimateHomogenousengineered earth fill,uniform propertiesAug 2012 <strong>WinDAM</strong> B Purpose & Policy14
Download <strong>WinDAM</strong> B?1. http://go.usa.gov/8Oq2. http://www.damsafety.info/3. Search for“NRCS <strong>WinDAM</strong> download”Feb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 15
<strong>WinDAM</strong> B Input
<strong>WinDAM</strong> B InputsPrincipal spillwayInflow hydrographsAuxiliary spillway(s)<strong>Analysis</strong> MethodsDam crest embankmentFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 17
Input Screens• Project Information• Model Properties• Dam SurfaceDescription• Structure Table• Hydrograph DataTable• Principal SpillwayType• Tailwater RatingTable• Aux Spillways• Aux Spwy RatingTable: #• Aux SpwyProperties: #• Headcut ModelFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 18
Geotechnical Input for<strong>Embankment</strong> ErosionTemple/HansonEnergy ModelErodibilityCritical shear stressAdvance ratecoefficientHanson/RobinsonStress ModelErodibilityCritical shear stressUndrained shearstrengthTotal unit weightFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 19
Output
Outputs• Breach & Dam• Emb Headcut• Hydrographs & Resv• <strong>Overtopping</strong>• Tailwater & RatingsFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 21
Output Types1) Summary Table2) Graphical Plots3) Text Output• Dam embankment - overtopping• Aux Spillway 1• Aux Spillway 2• Aux Spillway 3Feb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 22
Summary TableViewSummary TblFeb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 23
Summary Tbl EntriesInput Data Flow DamPS/AS Crest Peak Total RCI - Veg CoverTop of Dam Peak PS/AS Maintenance CodeLength of Dam Peak Overtop/Breach Max Gross Hydrograph Label Max Overtop Depth % Allowable Gross Peak Inflow Overtop Duration % Allowable Eff Start Routing Elev Max Overtop/Breach q % Allowable Unit qFeb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 24
Summary Tbl Entries(cont’d)BreachSlope Prot. Failure T Breach Init. TDam Breach Model Breach formation TFill Total Unit Weight Final Breach WidthFill Erodibility # ErrorsUndrained Shear # WarningsCritical Shear Fill Advance Rate CoeffFeb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 25
Plots: DamFeb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 26
Headcut/Breach WidthHow wide isembankmentbreach duringevent?Feb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 27
Dam Cross SectionWhat is dam crosssection?Feb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 28
Dam Crest ProfileWhat is elevation of dam crestbetween abutments?Feb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 29
Headcut AdvanceDam X-secHeadcut PositionSoil SurfacePlan viewHeadcut WidthFeb 2013HrsTime sliderFEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 30
Headcut PositionWhere is upstreamedge of breach?Feb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 31
Max Overtop/BreachUnit Discharge (cfs/ft)What is unitovertoppingflow?Feb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 32
Max Overtop HeadHow deep isovertoppingflow?Feb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 33
<strong>Overtopping</strong> Stress% Allowable 100% AllowErosionWhen doessurfaceprotection fail?Gross veg & soilEff – soil onlyFeb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 34
Plots – Aux Spwy• Geology• Erosion Max/Mean/Min• Hydrograph• Spillway Rating• Rate Equations• Threshold EquationsFeb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 35
Text Output• Dam• <strong>WinDAM</strong> output• Breach Progression Table• Breach Details• Auxiliary spillway 1/2/3• Spillway outputFeb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 37
Dam: <strong>WinDAM</strong> Output• Input data• Warnings• Summary output• Stress on <strong>Embankment</strong> Slope• Hydraulic Routing Detail Table• Spillway and Overtop Discharge Rating• Listing of Tabular Data-Expanded VolFeb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 38
Dam:Breach Progress TblFeb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 39
Dam: Breach DetailsFeb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 40
Aux Spwy: Spwy Output• Aux spwy flow hyd• Aux spwy inputs• Profile• Materials• Surface Conditions Summary by Reach• Integrity <strong>Analysis</strong>• Reach Surface Performance Summary• Headcut Erosion Damage SummaryFeb 2013FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 41
Does NRCS allow damovertopping?
NRCS Allow <strong>Overtopping</strong>?• NRCS Policy -TR-60• <strong>Overtopping</strong> duringdesign stormnot allowed• <strong>WinDAM</strong> B• Technical tool• Not policy• Examine “what if”Feb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 43
Use <strong>WinDAM</strong> B<strong>Overtopping</strong> for . . .Prioritize dam rehab projectsBreach analysis - emergencyaction plansHazard class - existing damsNew design & rehab designs(designed overtopping)Feb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 44
How can I prioritizedam safety rehabprojects?
AvailablefundingDam SafetyRehabilitationProject NeedsFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 46
Potential <strong>Overtopping</strong>Damage AssessmentInflow hydrograph(e.g. WinTR‐20/HEC‐HMS)<strong>Overtopping</strong>outflowhydrograph<strong>WinDAM</strong> BEstimatedownstreamdamages (affectedpeople &structures)Hydraulic routingdownstream(e.g. HEC‐RAS)Feb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 47
Greatest <strong>Overtopping</strong>DamageFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 48
<strong>Overtopping</strong> Basics• What qualitative answers shouldI expect from <strong>WinDAM</strong> B?• How can I check forreasonableness?Feb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 49
Dam Height vs ErosionErosionDam HeightFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 50
Stored Volume vs ErosionErosionStored VolumeFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 51
<strong>Overtopping</strong> Duration vsErosionErosion<strong>Overtopping</strong> DurationFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 52
Drainage Area vs ErosionErosionDrainage AreaFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 53
Cohesiveness vs ErosionErosionNon-cohesiveembankmentCohesiveembankmentFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 54
Factors that increaseerosion• Higher dam height• Greater stored volume• Longer overtopping duration• Larger drainage area• More erodible embankment materialFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 55
<strong>WinDAM</strong> B Results• Erosion Estimate• Suite of answers vs “the answer”• Order of magnitude - inputsFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 56
Corps of EngineersCorps of EngineersLevees & CanalsCan I use <strong>WinDAM</strong> B for levee andcanal overtopping?Feb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 57
<strong>WinDAM</strong> B Limitations –Levees & Canals• No internal erosion• No seepage/underflow component• No erosion estimate at levee toe (justbackslope of embankment)• Modify inflow hydrograph/capacitytable to model river stageFeb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 58
Questions?ND National Guard – Lake LaMoure 2009Feb 2013 FEMA NDS 20 - <strong>WinDAM</strong> B <strong>Software</strong> 59
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