Vulnerability to Floods

Texas Hazard Mitigation Package (THMP)

 

 

Data Layer:

Population Vulnerability: 1-Percent Floods (FEMA)
Content:
Total population and population density vulnerability to 1% annual chance floods according to census blocks in Texas.

Two map choices:

Total Population Vulnerability to 1-Percent Floods (FEMA)

Population Density Vulnerability to 1-Percent Floods (FEMA)

In Map 1, census blocks are categorized into 5 classes of  Population Vulnerability to 1-Percent Floods using the natural breaks method.

In Map 2, census blocks are categorized into 5 classes of  Population Density Vulnerability to 1-Percent Floods using the quantile method.

Values are categorized from High to Low.
Use Notes:

Assists in determining relative vulnerability of the population to this type of hazard.

Note: It is not a measure of extent of potential damage. It is a measure that combines exposure with risk to reveal where higher and lower vulnerability areas are relative to other areas. For a more detailed and qualitative analysis of Vulnerability, HAZUS is recommended.

Direct statewide download of this data layer.
User options for downloading this data layer or others by county (or statewide), use the Download Utility
Source:

Data layer was compiled internally, using 1% annual chance flood risk zone data from First American Flood Data Services (FAFDS) Floodmap Database.

First American Flood Data Services

Population data was compiled from the U.S. Census Bureau and Texas State Data Center

U.S. Census Bureau
www.census.gov/geo/www/tiger/

Texas State Data Center
txsdc.utsa.edu

 

Data Layer:

Property Value Vulnerability: 1-Percent Floods (FEMA)
Content:
Total property value and property value density vulnerability to 1% annual chance floods according to census blocks in Texas counties with FEMA Q3 flood risk zones

Two map choices:

Total Property Value Vulnerability to
1-Percent Floods (FEMA)

Property Value Density Vulnerability to
1-Percent Floods (FEMA)

In Map 1, census blocks are categorized into 5 classes of  Property Value Vulnerability to 1-Percent Floods using the natural breaks method.

In Map 2, census blocks are categorized into 5 classes of  Property Value Density Vulnerability to 1-Percent Floods using the quantile method.

Values are categorized from High to Low.
Use Notes:

Assists in determining relative vulnerability of the population to this type of hazard.

Note: It is not a measure of extent of potential damage. It is a measure that combines exposure with risk to reveal where higher and lower vulnerability areas are relative to other areas. For a more detailed and qualitative analysis of Vulnerability, HAZUS is recommended.

Property Value includes value of the building and its contents (but not the land).
Direct statewide download of this data layer.
User options for downloading this data layer or others by county (or statewide), use the Download Utility
Source:

Data layer was compiled internally, using 1% annual chance flood risk zone data from First American Flood Data Services (FAFDS) Floodmap Database.

First American Flood Data Services

Property value data was compiled internally, using data from FEMA’s HAZUS-MH General Building Stock inventory database.

FEMA / HAZUS-MH:
http://www.fema.gov/plan/prevent/hazus

U.S. Census Bureau
www.census.gov/geo/www/tiger/

Dun & Bradstreet
http://www.dnb.com/us/

RS Means
http://www.rsmeans.com/

 

Data Layer:

Population Vulnerability: Floods
(THMP Generalized)

Content:

Total population and population density vulnerability to floods according to census blocks in Texas counties with NO FEMA Q3 flood risk zone data.

Two map choices:

Total Population Vulnerability to Floods (THMP Generalized)

Population Density Vulnerability to Floods (THMP Generalized)

In Map 1, census blocks are categorized into 5 classes of  Population Vulnerability to Floods using the natural breaks method.

In Map 2, census blocks are categorized into 5 classes of  Population Density Vulnerability to Floods using the quantile method.

Values are categorized from High to Low.
Use Notes:

Assists in determining relative vulnerability of the population to this type of hazard.

Note: It is not a measure of extent of potential damage. It is a measure that combines exposure with risk to reveal where higher and lower vulnerability areas are relative to other areas. For a more detailed and qualitative analysis of Vulnerability, HAZUS is recommended.

Flood Risk Zones used for these Texas counties were generated by very generalized GIS buffering techniques

Direct statewide download of this data layer.
User options for downloading this data layer or others by county (or statewide), use the Download Utility
Source:

Data layer was compiled internally, using unofficial flood risk zones of predetermined buffer distances from the stream based on relative size (flow rate) of the stream. See 'Flood Risk Zones (THMP Generalized)' data layer for more.

Population data was compiled from the U.S. Census Bureau and Texas State Data Center.

U.S. Census Bureau
www.census.gov/geo/www/tiger/

Texas State Data Center
txsdc.utsa.edu

 

Data Layer:

Property Value Vulnerability: Floods
(THMP Generalized)

Content:
Total property value and property value density vulnerability to floods according to census blocks in Texas.

Two map choices:

Total Property Value Vulnerability to Floods (THMP Generalized)

Property Value Density Vulnerability to Floods (THMP Generalized)

In Map 1, census blocks are categorized into 5 classes of  Property Value Vulnerability to Floods using the natural breaks method.

In Map 2, census blocks are categorized into 5 classes of  Property Value Density Vulnerability to Floods using the quantile method.

Values are categorized from High to Low.
Use Notes:

Assists in determining relative vulnerability of the value of property to this type of hazard.

Note: It is not a measure of extent of potential damage. It is a measure that combines exposure with risk to reveal where higher and lower vulnerability areas are relative to other areas. For a more detailed and qualitative analysis of Vulnerability, HAZUS is recommend.

Property Value includes value of the building and its contents (but not the land).

Flood Risk Zones used for these Texas counties were generated by very generalized GIS buffering techniques

Direct statewide download of this data layer.
User options for downloading this data layer or others by county (or statewide), use the Download Utility
Source:

Data layer was compiled internally, using unofficial flood risk zones of predetermined buffer distances from the stream based on relative size (flow rate) of the stream. See 'Flood Risk Zones (THMP Generalized)' data layer for more.

Property value data was compiled internally, using data from FEMA’s HAZUS-MH General Building Stock inventory database.

FEMA / HAZUS-MH:
http://www.fema.gov/plan/prevent/hazus

U.S. Census Bureau
www.census.gov/geo/www/tiger/

Dun & Bradstreet
http://www.dnb.com/us/

RS Means
http://www.rsmeans.com/

 

OTHER HAZARD INFO

NOAA - Risk and Vulnerability Assessment Tool (RVAT)
http://www.csc.noaa.gov/rvat/

Note: This site only includes a study of a couple of counties in Florida on its Interactive Map Viewer.

It also includes a link to a Community Vulnerability Assessment Tool (CVAT) for a case study for New Handover County, NC.

The CVAT site has an online tutorial explaining the process of vulnerability assessments to hazards (click on Vulnerability Assessment Tutorial)

Also on the CVAT CD which can be ordered at the site there is a useful Damage Assessment Tool, which can be used for any case study.