FLOOD MODELING USING HAZUS IN ADA COUNTY A Hazard Mitigation Planning Perspective
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Transcript of FLOOD MODELING USING HAZUS IN ADA COUNTY A Hazard Mitigation Planning Perspective
FLOOD MODELING USING HAZUS IN ADA COUNTY
A Hazard Mitigation Planning Perspective
FLOOD MODELING USING HAZUS IN ADA COUNTY
A Hazard Mitigation Planning Perspective
Northwest GIS User Conference – 2011
Ed Whitford, CFM
Rob Flaner, CFM
Northwest GIS User Conference – 2011
Ed Whitford, CFM
Rob Flaner, CFM
Presentation OutlinePresentation Outline
1. Ada County Project Background
2. Introduction to Hazus-MH
3. Ada County Flood Model
4. The Versatility of Hazus
5. Questions
1. Ada County Project Background
2. Introduction to Hazus-MH
3. Ada County Flood Model
4. The Versatility of Hazus
5. Questions
Project BackgroundProject Background
Project BackgroundProject Background
Paul Marusich - ACCEM
Doug Hardman - ACCEM
Rob Flaner – Lead Planner Tetra Tech
Ed Whitford – Risk Assessment Lead
Paul Marusich - ACCEM
Doug Hardman - ACCEM
Rob Flaner – Lead Planner Tetra Tech
Ed Whitford – Risk Assessment Lead
Project BackgroundProject Background
Disaster Mitigation Act of 2000 (DMA)
• Local Governments and Special Service Districts MUST Prepare Local Hazard Mitigation Plans (LHMP) to be Eligible for Post Disaster Assistance
• Plan Must be Updated Every 5 Years
Disaster Mitigation Act of 2000 (DMA)
• Local Governments and Special Service Districts MUST Prepare Local Hazard Mitigation Plans (LHMP) to be Eligible for Post Disaster Assistance
• Plan Must be Updated Every 5 Years
Project BackgroundProject Background
Ada County – LHMP Update 2010Ada County – LHMP Update 2010
22 local Governments participated in the planning process.
Plan assessed Risk from Flood, Dam Failure, Earthquake, Wildfire, Landslide, and Severe Weather.
Plan approved by FEMA October 2011.
22 local Governments participated in the planning process.
Plan assessed Risk from Flood, Dam Failure, Earthquake, Wildfire, Landslide, and Severe Weather.
Plan approved by FEMA October 2011.
Project BackgroundProject Background
Local Hazard Mitigation Plan Flood Hazard Elements
• Identification of Hazards
Flood and Dam Failure
• Identification of Critical Facilities
Estimate of Recovery Time (days)
• Characterization of Building Inventory
Economic Loss ($$)
Short Term Shelter Needs, Debris Generation
• Identification of Mitigation Projects
Based on Flood and Dam Failure Model Results
Local Hazard Mitigation Plan Flood Hazard Elements
• Identification of Hazards
Flood and Dam Failure
• Identification of Critical Facilities
Estimate of Recovery Time (days)
• Characterization of Building Inventory
Economic Loss ($$)
Short Term Shelter Needs, Debris Generation
• Identification of Mitigation Projects
Based on Flood and Dam Failure Model Results
Introduction to Hazus MHIntroduction to Hazus MH
Introduction to GIS & Hazus MHIntroduction to GIS & Hazus MH
Hazus IS AN ArcGIS EXTENSIONHazus IS AN ArcGIS EXTENSION
Introduction to GIS & Hazus MHIntroduction to GIS & Hazus MH
Hazus IS AN ArcGIS EXTENSIONHazus IS AN ArcGIS EXTENSION
4. Estimate Losses
3. Determine Damage
2. Define and Overlay Inventory
1. Define Hazard: Flood Surface Land Surface
4. Estimate Losses
3. Determine Damage
2. Define and Overlay Inventory
1. Define Hazard: Flood Surface Land Surface
Introduction to GIS & Hazus-MHIntroduction to GIS & Hazus-MH
Level 1 DefaultDatabases
Level 2 UserModified
Data
Level 3 ExpertSupplied
Data
Hazus IS AN ArcGIS EXTENSIONHazus IS AN ArcGIS EXTENSION
Introduction to GIS & Hazus MHIntroduction to GIS & Hazus MH
The Depth Grid
Raster data output
Cell values based on water depth
Inventory Data
Census block characteristics
Detailed structure information
Critical Facilities
Depth Damage Function
Relationship of water depth
and first floor height of structures
The Depth Grid
Raster data output
Cell values based on water depth
Inventory Data
Census block characteristics
Detailed structure information
Critical Facilities
Depth Damage Function
Relationship of water depth
and first floor height of structures
HOW DOES HAZUS ASSESS RISK AND LOSSES?HOW DOES HAZUS ASSESS RISK AND LOSSES?
Introduction to GIS & Hazus-MHIntroduction to GIS & Hazus-MH
WATER DEPTH DAMAGE FUNCTIONWATER DEPTH DAMAGE FUNCTION
Subtract ground surface from flood surface to determine flood depth
throughout the study area
Datum
Ground
Elevation
Flood
Elevation
Ada County Flood Model Overview
Ada County Flood Model Overview
Flood Model OverviewFlood Model Overview
Flood Hazard Data
• FEMA DFIRM Data – County-wide
• USACE – Boise River, Diversion Dam to Eagle Island
• IDWR – Eagle Island Area
Terrain Data
• Boise River and “Miles” Creek LiDAR
• ADA County 2’ Contours
Flood Hazard Data
• FEMA DFIRM Data – County-wide
• USACE – Boise River, Diversion Dam to Eagle Island
• IDWR – Eagle Island Area
Terrain Data
• Boise River and “Miles” Creek LiDAR
• ADA County 2’ Contours
Flood Model OverviewFlood Model Overview
Dam Failure Study
• USACE - Lucky Peak Reservoir
Terrain Data
• 1/3 Arc Second DEM
Dam Failure Study
• USACE - Lucky Peak Reservoir
Terrain Data
• 1/3 Arc Second DEM
Flood Model OverviewFlood Model Overview
Critical Facilities
• Input from all 22 planning partners
• Facilities included; medical, protective, schools, water/wastewater, transportation, government
• FEMAs Comprehensive Data Management System (CDMS) used to update all Critical Facilities
Critical Facilities
• Input from all 22 planning partners
• Facilities included; medical, protective, schools, water/wastewater, transportation, government
• FEMAs Comprehensive Data Management System (CDMS) used to update all Critical Facilities
Flood Model OverviewFlood Model Overview
Building Specific Data
• Ada County parcel centroids
• Building characteristics extracted from County Assessor Database
• year built
• square footage
• construction class
• use code
• number of stories
• improvement value
• Building First Floor Height Developed using effective FIRM date
Building Specific Data
• Ada County parcel centroids
• Building characteristics extracted from County Assessor Database
• year built
• square footage
• construction class
• use code
• number of stories
• improvement value
• Building First Floor Height Developed using effective FIRM date
Parcel # R8266020270Address 3117 N TAMARACK DR
CityLatitude 43.649004
Longitude -116.240354Occupancy ResidentialYear Built 1939
No. Stories 1Building Cost $160,800Content Cost $88,000Building Type WOODSquare Feet 1,200
Foundation Type 5First Floor Height 2.2
Flood Model OverviewFlood Model Overview
Building Specific data used to update Hazus General Building Stock (GBS) - Census Block Aggregated Data
Comprehensive Data Management System
• Building Count
• Square Footage
• Building Value ($)
• Content Value ($)
Building Specific data used to update Hazus General Building Stock (GBS) - Census Block Aggregated Data
Comprehensive Data Management System
• Building Count
• Square Footage
• Building Value ($)
• Content Value ($)
Building Count Square Feet Building Cost Content Cost
Hazus Default 124,467 234,884,300 $23,660,312,000 $15,565,086,000
Assessor Update 136,519 346,210,559 $25,758,351,730 $19,839,917,577
Diff 12,052 111,326,259 $2,098,039,730 $4,274,831,577
Flood Model OverviewFlood Model Overview
Building Specific data also loaded as User Defined Facilities
Over 30,000 structures loaded into Hazus Flood Model
Building Specific data also loaded as User Defined Facilities
Over 30,000 structures loaded into Hazus Flood Model
Flood Model OverviewFlood Model Overview
Hazus flood model outputs used in the planning effort…
Building Specific (UDF Analysis)
• Building Loss ($)
• Content Loss ($)
• Commercial Inventory Loss ($)
Census Block (GBS Analysis)
• Displaced Households/Short Term Shelter Needs
• Debris Generation, Vehicle Damage
Critical Facilities
• Days to 100% Functionality, Percent Damage
Hazus flood model outputs used in the planning effort…
Building Specific (UDF Analysis)
• Building Loss ($)
• Content Loss ($)
• Commercial Inventory Loss ($)
Census Block (GBS Analysis)
• Displaced Households/Short Term Shelter Needs
• Debris Generation, Vehicle Damage
Critical Facilities
• Days to 100% Functionality, Percent Damage
Versatility of HazusVersatility of Hazus
Hazus VersatilityHazus Versatility
Hazus has evolved into a multifaceted planning tool
Regionally relevant Hazus models can be used for:
• Public information
• To support benefit cost analyses for mitigation grant applications
• Risk based analysis of capital projects
• “What if” scenarios
• Planning (mitigation, emergency management, COOP, debris management)
Hazus has evolved into a multifaceted planning tool
Regionally relevant Hazus models can be used for:
• Public information
• To support benefit cost analyses for mitigation grant applications
• Risk based analysis of capital projects
• “What if” scenarios
• Planning (mitigation, emergency management, COOP, debris management)
Public OutreachPublic Outreach
Hazus is a powerful public outreach tool
To gauge peoples perception of risk, you need to be able to show them how a hazard may impact them personally (“I never new !”)
A regionally relevant risk assessment is the key.
Can really promote the concept of mitigation
“Have you thought about……?”
People like having access to this type of information
Very media friendly!
Hazus is a powerful public outreach tool
To gauge peoples perception of risk, you need to be able to show them how a hazard may impact them personally (“I never new !”)
A regionally relevant risk assessment is the key.
Can really promote the concept of mitigation
“Have you thought about……?”
People like having access to this type of information
Very media friendly!
Example OutputsExample Outputs
Legend
For informational purposes only,not a regulatory flood map.
¹1 inch =500 feet
FEMA 1% Annual
Chance Flood
High: 24 ft
Low: 0 ft
Risk Based Analysis of Capital ProjectsRisk Based Analysis of Capital Projects
Can use Hazus to perform “alternatives” analysis of capital projects.
Can compare losses avoided from one alternative to another.
“what if” scenarios
Can be a great tool to illustrate project benefits to garner political support.
Can use Hazus to perform “alternatives” analysis of capital projects.
Can compare losses avoided from one alternative to another.
“what if” scenarios
Can be a great tool to illustrate project benefits to garner political support.
Project ExampleRisk Based Analysis of Capital Projects
Project ExampleRisk Based Analysis of Capital Projects King County, WA
180th-200th Levee alternative analysis
Used Hazus and BCAR to look at impacts for 3 setback levee alignments, plus an existing condition analysis.
Hazus used to model pre and post project impacts.
BCAR used to calculate annualized avoided damages.
Analysis included levee breach probabilities.
Analyzed 4 flows, 3 dam operational scenarios, for 4 levee alignments (that is 48 sets of depth grids!)
Over 1900 user defined facilities
King County, WA
180th-200th Levee alternative analysis
Used Hazus and BCAR to look at impacts for 3 setback levee alignments, plus an existing condition analysis.
Hazus used to model pre and post project impacts.
BCAR used to calculate annualized avoided damages.
Analysis included levee breach probabilities.
Analyzed 4 flows, 3 dam operational scenarios, for 4 levee alignments (that is 48 sets of depth grids!)
Over 1900 user defined facilitiesWater Depth In Building
High :8
Low : 0
QuestionsQuestions