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DAM FAILURE TOOL TRAINING AT THE NERFC

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DAM FAILURE TOOL TRAINING AT THE NERFC. National HIC Meeting July 2006. AVAILABLE TOOLS. DamCrest NID Catalog Dam Failure Manual Dam Crest Additional RFC Tools FLDWAV Dambreak FLDVIEW/FLOAT (x section and mapping) HEC RAS Dambreak BOSS Dambreak. TRAINING. Understanding dam failures

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slide1

DAM FAILURE TOOL TRAINING AT THE NERFC

National HIC Meeting July 2006

available tools
AVAILABLE TOOLS
  • DamCrest NID Catalog
  • Dam Failure Manual
  • Dam Crest
  • Additional RFC Tools
    • FLDWAV Dambreak
    • FLDVIEW/FLOAT (x section and mapping)
    • HEC RAS Dambreak
    • BOSS Dambreak
training
TRAINING
  • Understanding dam failures
  • Using and correcting Catalog of Dams
  • Use of Dam Crest
  • Manual for Reference
slide4
DamCREST NID Catalog --- Pertinent Information for Input to SMPDMBK --- check for correctness * indicates no info on dam
nerfc dambreak training manual
NERFC Dambreak Training Manual
  • Annual Dam Failure Drill
  • Eastern Region Dam Break Supplement
  • Basic Information on Dams
  • Typical Northeast USA Dams
  • Breach Parameter Selection
  • Manning’s “n” Coefficient Selection
  • Pertinent Emergency Action Plan (EAP) Information
  • Dam Safety Contacts by State
  • Dam Safety Laws/Regulations by State
  • Major Causes of Dam Failures
  • Guideliines for Determining Failure Types
  • Guidelines for using DamCREST – existing and updating the dam catalogue
  • NWS Simplified Dambreak Examples
  • Forms and Checklists/Report Log
  • National Inventory of Dams (NID) Glossary
  • HIGH Hazard Dams catalogued by HSA/NERFC Forecast Groups/State
  • Example HIGH Hazard Dam Failure using DamCREST
  • DamCREST – DamCatalogue Reviewer and EStimating Tool
nerfc training on damcrest
NERFC Training on DamCREST
  • Field visit a local HIGH hazard Dam
  • Check pertinent structures at the dam – i.e. principal spillway, emergency spillway, dam crest, low-level outlet, right abutment, etc.
  • Consider failure modes/scenarios applicable for use in DamCREST
  • Check downstream river valley for hydraulic controls (man-made or natural) and Manning’s “n” of channel and floodplain (at least 1 mile)
  • Check NID Dam catalogue for pertinent dam data correctness
  • Office setup of DamCREST from field trip including dam properties and downstream river valley x-sections for routing of Simplified Dambreak flood wave
  • Use USGS 1:24000(or orthoquad) mapping and FEMA FIS profiles to develop x-sections (future x-sections using GIS DEM layers with FLDVIEW and FLDAT)
whittenton dam incident
Whittenton Dam Incident
  • Potential Failure of HIGH Hazard structure – n 15 ft high timber/concrete dam
  • Approximate 100 yr – 24 hour event occurred prior to near-failure
  • National media/NOAA and DOC attention
nws response a team effort
NWS RESPONSEA Team Effort
  • Flash Flood Warnings
  • Dam Failure Scenarios
    • DamCREST scenarios run on full and partial failure of dam (9 cases in all)
    • DamCREST setup and run-time for Emergency Personnel < 30 minutes (9 cases studied)
    • Supplement info included HEC-2/HEC-RAS analysis of bridge/culvert capacities downstream of dam during October 2006 flooding for determining pump (bypass flow) sizing ---- main concern not to increase existing river flooding
  • Attended Media Briefings
  • Scenarios on future rain event
    • Ungaged basin analysis using HEC-1 rainfall/runoff model for future QPF event
    • DamCREST failure scenario on temporary rock structure
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