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DAM FAILURE TOOL TRAINING AT THE NERFC

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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DAM FAILURE TOOL TRAINING AT THE NERFC

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  1. DAM FAILURE TOOL TRAINING AT THE NERFC National HIC Meeting July 2006

  2. 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

  3. TRAINING • Understanding dam failures • Using and correcting Catalog of Dams • Use of Dam Crest • Manual for Reference

  4. DamCREST NID Catalog --- Pertinent Information for Input to SMPDMBK --- check for correctness * indicates no info on dam

  5. 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

  6. DamCREST Model GUI mode

  7. 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)

  8. DamCREST OutputSimplified Dambreak File, Flood Failure Graphics, Forecast Text File

  9. 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

  10. 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

  11. IT COULD HAPPEN IN YOUR AREA!Kauai 3/14/2006

  12. QUESTIONS

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