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

AVAILABLE TOOLS DamCrest NID Catalog DamCrest NID Catalog Dam Failure Manual Dam Failure Manual Dam Crest Dam Crest Additional RFC Tools Additional RFC Tools FLDWAV Dambreak FLDWAV Dambreak FLDVIEW/FLOAT (x section and mapping) FLDVIEW/FLOAT (x section and mapping) HEC RAS Dambreak HEC RAS Dambreak BOSS Dambreak BOSS Dambreak

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

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

NERFC Dambreak Training Manual Annual Dam Failure Drill Annual Dam Failure Drill Eastern Region Dam Break Supplement Eastern Region Dam Break Supplement Basic Information on Dams Basic Information on Dams Typical Northeast USA Dams Typical Northeast USA Dams Breach Parameter Selection Breach Parameter Selection Manning’s “n” Coefficient Selection Manning’s “n” Coefficient Selection Pertinent Emergency Action Plan (EAP) Information Pertinent Emergency Action Plan (EAP) Information Dam Safety Contacts by State Dam Safety Contacts by State Dam Safety Laws/Regulations by State Dam Safety Laws/Regulations by State Major Causes of Dam Failures Major Causes of Dam Failures Guideliines for Determining Failure Types Guideliines for Determining Failure Types Guidelines for using DamCREST – existing and updating the dam catalogue Guidelines for using DamCREST – existing and updating the dam catalogue NWS Simplified Dambreak Examples NWS Simplified Dambreak Examples Forms and Checklists/Report Log Forms and Checklists/Report Log National Inventory of Dams (NID) Glossary National Inventory of Dams (NID) Glossary HIGH Hazard Dams catalogued by HSA/NERFC Forecast Groups/State HIGH Hazard Dams catalogued by HSA/NERFC Forecast Groups/State Example HIGH Hazard Dam Failure using DamCREST Example HIGH Hazard Dam Failure using DamCREST DamCREST – Dam Catalogue Reviewer and EStimating Tool DamCREST – Dam Catalogue Reviewer and EStimating Tool

DamCREST Model GUI mode

NERFC Training on DamCREST Field visit a local HIGH hazard Dam 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. 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 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 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 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 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 ) 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 )

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

Whittenton Dam Incident Potential Failure of HIGH Hazard structure – n 15 ft high timber/concrete dam Potential Failure of HIGH Hazard structure – n 15 ft high timber/concrete dam Approximate 100 yr – 24 hour event occurred prior to near- failure Approximate 100 yr – 24 hour event occurred prior to near- failure National media/NOAA and DOC attention National media/NOAA and DOC attention

NWS RESPONSE A Team Effort Flash Flood Warnings Flash Flood Warnings Dam Failure Scenarios Dam Failure Scenarios DamCREST scenarios run on full and partial failure of dam (9 cases in all) 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) 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 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 Attended Media Briefings Scenarios on future rain event Scenarios on future rain event Ungaged basin analysis using HEC-1 rainfall/runoff model for future QPF event Ungaged basin analysis using HEC-1 rainfall/runoff model for future QPF event DamCREST failure scenario on temporary rock structure DamCREST failure scenario on temporary rock structure

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

QUESTIONS