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dam safety modeling
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HAZUS and Mitigation Planning
Dam Breach Inundation Modeling, Mapping, and
Risk Assessment
March, 2012
Overview
Reasons for conducting study Components Methodology Deliverables / Results
4Background of Project
Reasons for conducting the study:1.Enrich Understanding 2.Value Enhancement 3.Estimate Costs 4.Application
Components
HEC RAS Module
Components
HEC RAS Module
Terrain
Components
HEC RAS Module
Terrain Depth Grid
Components
HEC RAS Module
Terrain Depth Grid User Defined
Facility Database
Components
HEC RAS Module
Terrain Depth Grid User Defined
Facility Database HAZUS
11
Methodology
Economic Social Environmental-Structures-Infrastructure-Indirect Costs
-Loss of Life-Injuries-Psychological Effects-Lowered Confidence in Government Abilities.
-Debris-Water Quality-Sediment-Wildlife
12
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
13
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.
Residual Risks of Flooding Attributed to Lower Loch Highland Dam Break
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
16
Depth Grids Velocity Grids Danger Zones
Deliverables
17
Danger Zones
18
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
Questions?
Contact Information:
Jason Brown, [email protected]: 678.537.8620