DAM FAILURE TOOL DAM FAILURE TOOL TRAINING AT THE NERFCTRAINING AT THE NERFC

National HIC Meeting July 2006

AVAILABLE TOOLSAVAILABLE TOOLS

DamCrest NID CatalogDamCrest NID Catalog Dam Failure ManualDam Failure Manual Dam CrestDam Crest Additional RFC ToolsAdditional RFC Tools

FLDWAV DambreakFLDWAV Dambreak FLDVIEW/FLOAT (x section and FLDVIEW/FLOAT (x section and

mapping)mapping) HEC RAS DambreakHEC RAS Dambreak BOSS DambreakBOSS Dambreak

TRAININGTRAINING

Understanding dam failuresUnderstanding dam failures Using and correcting Catalog of Using and correcting Catalog of

DamsDams Use of Dam CrestUse of Dam Crest Manual for ReferenceManual for Reference

DamCREST NID Catalog DamCREST NID Catalog --- --- Pertinent Information for Input to SMPDMBK Pertinent Information for Input to SMPDMBK

--- --- check for correctness check for correctness

** indicates no info on dam indicates no info on dam

CAR High Hazard Dams Caribou

STATE DAM NAME HAZARD EAP COUNTY NEAR CITY DIST CITY LENGTH(mi) (ft)

ME NARRAGUAGUS HIGH * WASHINGTON * 0 500 ME MATTACEUNK HIGH YES PENOBSCOT MATTAWAMKEAG 5 1170 ME SILVER LAKE HIGH * HANCOCK * 0 465 ME SEBEC HIGH YES PISCATAQUIS MILO 7 273 ME DOLBY HIGH YES PENOBSCOT E. MILLINOCKET 2 1395

STATE DAM NAME QMAX DAM HYDRAULIC NORMAL STORAGE WIDTH LAT LONGTYPE HEIGHT

(cfs) (ft) (ac-ft) (ft)

ME NARRAGUAGUS 0 RETC 24 0* * 44.61 -67.94ME MATTACEUNK 125000 CNPGRE * 55785 657 45.57 -68.41ME SILVER LAKE 0 RECN 24 0* * 44.59 -68.79ME SEBEC 4203 TCERCN * 60330 184 45.27 -69.12ME DOLBY 75000 CNPGRE * 41956 521 45.63 -68.61

*More INFO Earth/Timber CribNID HEIGHT Conc/Gravity/EarthSTRUCTURAL HEIGHT Earth/ConcOWNERS Timber Crib/Rockfill/EarthUSGS TOPO Conc/Gravity/Earth

NERFC Dambreak Training ManualNERFC Dambreak Training Manual

Annual Dam Failure DrillAnnual Dam Failure Drill Eastern Region Dam Break SupplementEastern Region Dam Break Supplement Basic Information on DamsBasic Information on Dams Typical Northeast USA DamsTypical Northeast USA Dams Breach Parameter SelectionBreach Parameter Selection Manning’s “n” Coefficient SelectionManning’s “n” Coefficient Selection Pertinent Emergency Action Plan (EAP) Pertinent Emergency Action Plan (EAP)

InformationInformation Dam Safety Contacts by StateDam Safety Contacts by State Dam Safety Laws/Regulations by StateDam Safety Laws/Regulations by State Major Causes of Dam FailuresMajor Causes of Dam Failures Guideliines for Determining Failure Guideliines for Determining Failure

TypesTypes Guidelines for using DamCREST – Guidelines for using DamCREST –

existing and updating the dam catalogueexisting and updating the dam catalogue NWS Simplified Dambreak ExamplesNWS Simplified Dambreak Examples Forms and Checklists/Report LogForms and Checklists/Report Log National Inventory of Dams (NID) National Inventory of Dams (NID)

GlossaryGlossary HIGH Hazard Dams catalogued by HIGH Hazard Dams catalogued by

HSA/NERFC Forecast Groups/StateHSA/NERFC Forecast Groups/State Example HIGH Hazard Dam Failure Example HIGH Hazard Dam Failure

using DamCRESTusing DamCREST

DamCREST – DamCREST – DamDam CCatalogue atalogue RReviewer eviewer and and ESEStimating timating TToolool

DamCREST DamCREST Model GUI modeModel GUI mode

NERFC Training on DamCRESTNERFC Training on DamCREST Field visit a local HIGH hazard DamField visit a local HIGH hazard Dam

Check pertinent structures at the dam – Check pertinent structures at the dam – i.e. principal spillway, emergency spillway, i.e. principal spillway, emergency spillway, dam crest, low-level outlet, right dam crest, low-level outlet, right abutment, etc.abutment, etc.

Consider failure modes/scenarios Consider failure modes/scenarios applicable for use in DamCRESTapplicable for use in DamCREST

Check downstream river valley for Check downstream river valley for hydraulic controls (man-made or natural) hydraulic controls (man-made or natural) and Manning’s “n” of channel and and Manning’s “n” of channel and floodplain (at least 1 mile)floodplain (at least 1 mile)

Check NID Dam catalogue for pertinent Check NID Dam catalogue for pertinent dam data correctnessdam data correctness

Office setup of DamCREST from field trip Office setup of DamCREST from field trip including dam properties and downstream including dam properties and downstream river valley x-sections for routing of river valley x-sections for routing of Simplified Dambreak flood waveSimplified Dambreak flood wave

Use USGS 1:24000(or orthoquad) mapping Use USGS 1:24000(or orthoquad) mapping and FEMA FIS profiles to develop x-and FEMA FIS profiles to develop x-sections (future x-sections using GIS DEM sections (future x-sections using GIS DEM layers with FLDVIEW and FLDATlayers with FLDVIEW and FLDAT))

DamCREST OutputDamCREST Output Simplified Dambreak File, Flood Failure Graphics, Forecast Text FileSimplified Dambreak File, Flood Failure Graphics, Forecast Text File

Whittenton Dam IncidentWhittenton Dam Incident Potential Failure of Potential Failure of

HIGH Hazard structure – HIGH Hazard structure – n 15 ft high n 15 ft high timber/concrete damtimber/concrete dam

Approximate 100 yr – 24 Approximate 100 yr – 24 hour event occurred hour event occurred prior to near-failure prior to near-failure

National media/NOAA National media/NOAA and DOC attentionand DOC attention

NWS RESPONSENWS RESPONSEA Team EffortA Team Effort

Flash Flood WarningsFlash Flood Warnings Dam Failure ScenariosDam Failure Scenarios

DamCREST scenarios run on full and partial failure of dam (9 cases DamCREST scenarios run on full and partial failure of dam (9 cases in all)in all)

DamCREST setup and run-time for Emergency Personnel < 30 DamCREST setup and run-time for Emergency Personnel < 30 minutes (9 cases studied)minutes (9 cases studied)

Supplement info included HEC-2/HEC-RAS analysis of bridge/culvert Supplement info included HEC-2/HEC-RAS analysis of bridge/culvert capacities downstream of dam during October 2006 flooding for capacities downstream of dam during October 2006 flooding for determining pump (bypass flow) sizing ---- main concern determining pump (bypass flow) sizing ---- main concern notnot to to increase existing river floodingincrease existing river flooding

Attended Media BriefingsAttended Media Briefings Scenarios on future rain eventScenarios on future rain event

Ungaged basin analysis using HEC-1 rainfall/runoff model for future Ungaged basin analysis using HEC-1 rainfall/runoff model for future QPF eventQPF event

DamCREST failure scenario on temporary rock structureDamCREST failure scenario on temporary rock structure

IT COULD HAPPEN IN IT COULD HAPPEN IN YOUR AREA!YOUR AREA!

Kauai 3/14/2006Kauai 3/14/2006

QUESTIONSQUESTIONS