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


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


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


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.


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



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



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


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


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


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


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


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


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

Documents

FLOOD MODELING USING HAZUS IN ADA COUNTY A Hazard Mitigation Planning Perspective