Floods

Identify the relative risk of this hazard, as expressed by historical occurrences

Tabular data includes summary of fatalities, injuries, property losses and crop losses by county.

Data was compiled internally, sourced from the University of South Carolina / Dept. of Geography, Hazards Research Lab
www.cas.sc.edu/geog/hrl/index.htm

For direct access to data source, SHELDUS database (Spatial Hazard Events and Losses Database for U.S.):
go2.cla.sc.edu/hazard/db_registration

Note: E-Mail address is required for access

United States Geological Survey (USGS)
www.usgs.gov

For direct source, see Open File Report 03-193 on CD (Slade, R.M. and John Patton, USGS).

Related USGS sources:
infotrek.er.usgs.gov/pubs/
www.usgs.gov/pubprod/

National Climatic Data Center / NOAA
www.ncdc.noaa.gov/oa/ncdc.html

…Direct link to Storm Events:
www4.ncdc.noaa.gov/cgi-win/wwcgi.dll?wwevent~storms

State = Texas, Event Type = Floods

Floodplains are categorized into 13 zones indicating relative risk areas from flooding

For list and descriptions of all 13 flood risk zones, please click: Flood Hazard Zone Designations or click here for a PDF Download.

Must zoom in to county/sub-county level to appropriately display data.

User Agreement:

The flood risk data provided on this site is for planning purposes only and not for commercial use. In order to download this data you must agree that you will not resell or use this data for commercial purposes. Rights to the commercial use of this product are retained and enforceable by FAFDS (First American Flood Data Services).

This data layer is a subset of FAFDS Nationwide Floodmap Database as of May 2007. It is derived from data based on the official paper maps known as FIRM's (Flood Insurance Rate Maps), and FISs (Flood Insurance Studies). The data is not designed to make precise in/out flood risk determinations. Instead, it is designed to provide a general proximity of the location of special flood hazard areas (SFHA's) for guidance in planning, mitigation, risk assessment, disaster response and recovery planning, etc. It does not include recently updated DFIRMs released after May 2007

Flood risk data is developed for communities participating in the NFIP (National Flood Insurance Program), for use in insurance rating, floodplain management.

FEMA DFIRM's (Digital Flood Insurance Rate Maps) are the official digital versions of the FIRM paper maps. However, only a few counties with DFIRM (Level 1 Flood Data) exists in Texas, or the U.S. No DFIRM data is available through this THMP Site.

For the possibility of obtaining digitial floodplain risk zones for counties, or areas within counties, not covered by this data, please contact the Texas Geographic Society at contactTXGS@texasgs.org

Data layer was compiled from First American Flood Data Services (FAFDS) Floodmap Database, which was digitized from FEMA's Flood Insurance Rate Maps (FIRMs), and other relevant documents or data. See the metadata above for more details.

First American Flood Data Services

Flood Zones are categorized into 5 zones of predetermined buffer distances (in meters) from the stream based on relative size (flow rate) of the stream

Data Layer resides on the Vulnerability Map Viewer. You must zoom in to county/sub-county level to appropriately display data.

WARNING: This flood risk data is "extremely generalized" and is only intended for flood risk zone approximation in planning purposes when no other digital flood risk data exists.

If this data is used, the extreme generality of the data should be noted (see Map buffer distances used above).

The primary purpose for creating this Data Layer was to cover counties not covered by Q3 level flood data and then use in the Vulnerability Map Viewer for overlaying Exposure data (Population and Property Value) for assessing relative vulnerability.

Data layer was compiled internally, using Rivers and Streams data layer as reference.