Dam Hazard Consequences

AssessmentASFPM May 2010

James Demby – FEMAEd Beadenkopf - RAMPPJim Murphy - RAMPP

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Dam Hazard Consequences Assessment OVERVIEW

Objectives

Work Plan

Approach

Assessment

Pilot Studies

Schedule

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Dam Hazard Consequences Assessment Provide recommendations for a process a community can follow to effectively execute an economical and effective dam failure consequence assessment

OBJECTIVES

Work with stakeholders to conduct a pilot study to assess the potential consequences to a community from a dam failure

Evaluate the processes used in the pilot study to determine the lessons learned, capture the best practices, and provide recommendations on an assessment process

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Dam Hazard Consequences Assessment

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FEMA Dam Safety Task Orders Two task orders were issued in Sept 2009

Dam Consequence/Assessment

Standardized Guidance for Dam Breach Modeling and Inundation Mapping

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Dam Hazard Consequences Assessment APPROACH Select a representative dam/communities for the pilot studies

Coordinate with state and local stakeholders (e.g., decision makers, emergency managers, planners, first responders)

Support a community with the analysis of their vulnerability to dam failure through a collaborative process

Compile, analyze, and document the study results in a report that captures lessons learned, best practices, and recommendations for an assessment process

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Dam Hazard Consequences Assessment ASSESSMENT Impacts on human health and safety, special needs facilities, industrial

areas, and Critical Infrastructure and Key Resources (CIKR)

Economic and environmental impacts

Impact on local government capabilities and services

Indirect effects due to disruption and loss of function by key facilities, such as power supply and water

Impact on public confidence

Visualization of structures depth of flooding

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Dam Hazard Consequences Assessment IMPACTS TO BE EVALUATED Direct Economic Impacts

Physical impacts Immediate recovery costs Debris removal

Regional and Indirect Economic Impacts Indirect impacts (e.g., relocation, loss of business) Induced Impacts (e.g., loss of critical infrastructure)

Social Impacts Loss of Life Psychological issues/stress related to hazard event Public confidence issues

Environmental Impacts Natural Resources HTRW Concerns

Institutional Impacts Governmental Services Nongovernmental Services

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Dam Hazard Consequences Assessment SELECTION OF PILOT STUDY COMMUNITIES Developed Action Plan to select and prioritize communities for pilot

study

Evaluate key information about communities Population at risk – potential loss of life (significant population size within 5-15 miles of

dam) Significant infrastructure impacts Impacts to lifeline systems – impacts on first responders and emergency management

assets, required systems and networks Loss to function or performance of the dam/reservoir (e.g. loss of municipal water supply) Environmental and Economic Impacts

Identified 12 communities as potential pilot studies

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Dam Hazard Consequences Assessment SELECTION OF PILOT STUDY COMMUNITIES Communities below the Howard Hanson Dam in the State of

Washington have been selected for the first pilot study Unique opportunity for FEMA to work the USACE and DHS Efforts are part of the Dam Sector Exercise Series 2010 (DSES-10) Initial planning workshop held in April 2010

Recently received funding to conduct two additional pilot studies One pilot study anticipated to be conducted in the Washington DC region One pilot study anticipated to be conducted in North Carolina

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Dam Hazard Consequences Assessment SELECTION OF PILOT STUDY COMMUNITIES Howard Hanson Dam

USACE owns and operated the dam Safety concerns have forced the operation of the reservoir to remain at normal pool

elevation, therefore no flood storage capabilities To operate the dam to prevent catastrophic failure, increased releases may occur Downstream communities will experience increased flooding because of the lack of

floodwater retention at the dam Impacted areas are heavily developed Downstream communities very active in preparing for increased flooding and have been

coordinating with each other and other agencies

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Dam Hazard Consequences Assessment SELECTION OF PILOT STUDY COMMUNITIES Howard Hanson Dam (continued)

Currently being evaluated as part of the 2010 Dam Sector Exercise Series (DSES-10) Opportunity to collaborate with DHS and USACE Attended initial planning workshop in late April Currently working with DHS and USACE to define FEMA’s role with DSES-10

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Dam Hazard Consequences Assessment2010 DAMS SECTOR EXERCISE SERIES – GREEN

RIVER VALLEY (DSES-10)Overall Purpose: Enhance regional preparedness and disaster resilience

thru multi-jurisdictional discussion-based activities involving a wide array

of public and private stakeholders.DSES-10 Focus: Analysis of short- and long-term regional impacts

created by a flooding scenario affecting a large portion of the Green River

Valley. Flooding scenario will serve as the triggering event to analyze impacts

and interdependencies.

DSES-10 Goal: Develop a regional resilience strategy in collaboration

with public and private stakeholdersCommunities at Risk: Auburn, Kent, Renton, and Tukwila in King

County, State of Washington.

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Dam Hazard Consequences Assessment

Howard Hanson Dam

Renton

Tukwila

Kent

Auburn

Seattle

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Dam Hazard Consequences Assessment

a) Regional Baseline Assessment

b) Regional Consequence Assessment

c) Regional ResilienceStrategy

Regional Baseline Assessment Report

Regional Consequence

Assessment Report

Regional Resilience Strategy

1) Initial Planning Workshop

2) Regional Assessment

Seminar

3) Regional ConsequenceAssessmentWorkshop

4) Regional ResilienceTable-TopExercise

04/28/10 03/1106/30/10 07/21/10 09/08/1008/11/10 10/21/10

DSES-10Regional

Conference

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Dam Hazard Consequences AssessmentINITIAL DSES PLANNING WORKSHOP Date: Wed 28 April 2010 (Seattle, WA)

Total Participants: 150 (private & public sector)

Federal (55), State (20), County (10), City (29), Private Sector (26), NGOs (10) Federal Agencies: BPA, DHS, FEMA (HQ and Region X), FERC, NOAA, NWS, USACE State of Washington King County Cities of Auburn, Kent, Renton, Seattle and Tukwila AT&T, Bank of America, Boeing, Chelan County PUD, Costco, Puget Sound Energy,

Qwest, Safeway, among others

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Dam Hazard Consequences Assessment

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Dam Hazard Consequences Assessment REPORT OUTLINEHazard Identification - information that is required for conducting the

consequence analysis, the type of information required as well as the agency, stakeholder, or source of this information

Risk and Vulnerability Assessment - methodologies and frameworks communities can use to identify assets (e.g., human, structural, governmental, economic, and environmental) that may be at risk

Consequence Assessment - provide methods for communities to assess the potential impacts and the extent of damages of a dam failure on their community

How to Apply the Results – what a community can do with the results