Ga Dam Safety Gafm
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HAZUS and Mitigation Planning Dam Breach Inundation Modeling, Mapping, and Risk Assessment March, 2012
description
dam safety modeling
Transcript of Ga Dam Safety Gafm
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HAZUS and Mitigation Planning
Dam Breach Inundation Modeling, Mapping, and
Risk Assessment
March, 2012
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Overview
Reasons for conducting study Components Methodology Deliverables / Results
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4Background of Project
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Reasons for conducting the study:1.Enrich Understanding 2.Value Enhancement 3.Estimate Costs 4.Application
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Components
HEC RAS Module
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Components
HEC RAS Module
Terrain
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Components
HEC RAS Module
Terrain Depth Grid
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Components
HEC RAS Module
Terrain Depth Grid User Defined
Facility Database
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Components
HEC RAS Module
Terrain Depth Grid User Defined
Facility Database HAZUS
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Methodology
Economic Social Environmental-Structures-Infrastructure-Indirect Costs
-Loss of Life-Injuries-Psychological Effects-Lowered Confidence in Government Abilities.
-Debris-Water Quality-Sediment-Wildlife
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HAZUS Approach Allows for consistent methodology between
study areas. Damage estimate calculated by FEMA
approved methodologies.
Challenges Adopting HAZUS Flood Module to Dam Break Scenario Only accounts for damages due to depth of
flooding, does not consider velocities Damage estimates extremely sensitive to
each structures X,Y location attributed in HAZUS database.
Due to the small area studied, any aggregate data not updated is subject to high uncertainty.
Methodology Economic Assessment
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Methodology Social Assessment
Total Population
% of PAR At
Home
Weekday
% of PAR
At Home
Weekend
Total PAR
At Home
Weekday
Total PAR
At Home
Weekend
12am - 7am 118 90% 90% 106 106
7am - 5pm 118 15% 50% 18 59
5pm - 12am 118 75% 60% 89 71
Step 1: The occupancy type of all inundated buildings was collected.
Step 2: Using the occupancy values for each structure (from Step 1), a multiplier is used to determine the population at risk at the time of dam failure.
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Residual Risks of Flooding Attributed to Lower Loch Highland Dam Break
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Economic Impacts Building Losses
~$2.6 million
Transportation Losses~$1.4 million
Indirect Losses~$400k
Social Impacts
Population at Risk ~100 people
Loss of Life~ 30 40 people
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Depth Grids Velocity Grids Danger Zones
Deliverables
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Danger Zones
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Can help provide data to dam safety officials. Assist State/Local Emergency Responders Identify how Inundation dataset can assist dam safety officials in
developing EAP Can help promote EAP development
Products developed during the pilot can potentially become enhanced Risk MAP products and even used for inclusion in an Hazard Mitigation Plan
Conclusion
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Questions?
Contact Information:
Jason Brown, [email protected]: 678.537.8620
