Statewide Floodplain Risk Zones

TNRIS - Richard Arnold 05/25/2007 Statewide Floodplain Risk Zones vector digital data Austin, TX FAFDS See Cross Reference for original source. withheld FAFDS Statewide data indicating 100 year floodplains. Areas with a 1% annual chance of flooding within the State of Texas is a subset of FAFDS nationwide Floodmap database. The Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). Individual files representing all counties within the State of Texas are georeferenced to earth's surface using a geographic coordinate system. The specifications for the horizontal control of FAFDS data files are consisitent with those required for mapping at a scale of 1:24,000. To show the 100 year floodplains in the state of Texas for the Texas Hazard Mitigation Package (THMP). FAFDS Floodmap Database presents the flood risk information depicted on the FIRMs and associated documents and data in a digital format suitable for use in electronic mapping applications. Although primarily intended for flood hazard determination business, FAFDS Floodmap database can be used for floodplain management, mitigation, risk assessment, disaster response and recovery planning, environmental impact planning, and site selection. Data covers 244 counties, 10 other counties did not have any data. en 05/10/2007 publication date Complete As needed -106.950042 -93.128094 36.464552 25.706588 874915.440309 2118038.823739 6861680.007064 8037681.996767 none Flood data Flood zone Flood map Special Flood Hazard Area SFHA USA Texas Texas counties As defined in the License Agreement with the Texas Geographic Society. These digital data are produced in conjunction with hardcopy FIRMs and generally match the hardcopy map very well. However the hardcopy FIRM and DFIRM and the accompanying FISs are only the authoritative documents for the National Flood Insurance Program (NFIP). Craig Eissler Texas Geographic Society mailing and physical address

514 Terrace Dr.

Austin Texas 78704 USA 512-912-9695 512-912-0035 craig@texasgs.org for additional contact refer to: www.texasgs.org or www.thmp.info First American Flood Data Services ESRI ArcCatalog 9.3.1.3000 First American Flood Data Services (FAFDS) 05/10/2007 Areas with 1% annual chance of flooding within the State of Texas vector digital data Austin, TX FAFDS Primary contact: Mark C. Green, First American Flood Data Services, 11902 Burnet Rd, Austin, TX Phone: (877) 888-7808 Email: mcgreen@firstam.com http://www.floodcert.com Shapefile Attribute accuracy was tested by manual comparsion of source graphics with hardcopy plots and a symboloized display on an interactive computer graphic system. Flood zone polygons may not exist in some counties. Only SFHA as published by FEMA on FIRMs are included. Data contained in FAFDS Floodmap Database files reflect the content of the source materials. Features may have been eliminated or generalized on the source graphic, due to scale and legibility constraints. Flood risk data are developed for communities participating in the NFIP for use in insurance rating and for floodplain management. Flood hazard areas are determined using statistical analyses of records of river flow, storm tides, and rainfall; information obtained through consultation with communitities; floodplain topographic surveys; and hydrological and hydraulic analysis. Both detailed and approximate analyses are employed. Generally, detailed analyses are used to generate flood risk data only for developed or developing areas of communities. For more areas were little or no development is expected to occur, FEMA uses approximate analyses to generate flood risk data. Typically, only drainage areas that are greater than one square mile are studied. Horizontal accuracy was tested by visual comparsion of digitized vector data with hardcopy FIRMs and a symboloized display on an interactive computer graphic system. Flood zones along county boundaries may overlap or have gaps between zones across counties, or may not align in a logical fashion. Data is left as is in accordance with data quality noted above. Federal Emergency Management Agency 1976-2007 map http://msc.fema.gov Federal Emergency Manangement Agency http://msc.fema.gov 24000 paper 05/10/2007 publication date Floodplains for 244 counties merged together to create a single State-wide dataset. withheld 05/2007 Reprojected to Albers Conical Equal Area. See Spatial Reference Information below for details. 05/2007 Metadata added. 05/2007 Personal Geodatabase created. Loaded data from shapefile. withheld 20070516 16504600 Vector Simple FALSE 0 TRUE FALSE coordinate pair 0.000000 0.000000 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 GCS_North_American_1983 All_sids_albers Explicit elevation coordinate included with horizontal coordinates 1.000000 Statewide Floodplain Risk Zones Feature Class 0 OBJECTID OBJECTID OID 4 10 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. SHAPE Shape Geometry 8 0 0 Feature geometry. ESRI Coordinates defining the features. STATE_CODE STATE_CODE String 2 Alias Label: FIPS State 0 0 COUNTY_COD COUNTY_COD String 3 Alias Label: FIPS County 0 0 D_ZONE D_ZONE String 10 Alias Label: Risk Zone 0 0 Shape.STArea() Shape.STArea() Double 0 0 0 Shape.STLength() Shape.STLength() Double 0 0 0 http://www.itl.nist.gov/fipspubs/fip5-2.htm http://www.itl.nist.gov/fipspubs/fip6-4.htm http://msc.fema.gov/webapp/wcs/stores/servlet/info?storeId=10001&catalogId=10001&langId=-1&content=floodZones&title=FEMA%20Flood%20Zone%20Designations Craig Eissler Texas Geographic Society User Liaison mailing and physical address

514 Terrace Dr.

Austin Texas 78704 USA 512-912-9695 512-912-0035 craig@texasgs.org Downloadable data www.thmp.info 162.956 0.000 None Download from www.thmp.info immediate GIS software required to view the data. If not available, download free software (ArcExplorer, ArcReader or similar) from www.esri.com or other sources. 20100827 Texas Water Development Board (TNRIS) Richard Arnold, Miguel Pavon GIS Research Specialist / Administrator Texas-Mexico Borderlands Information Center mailing and physical address

1700 N Congress Ave

Room B-40

Austin Texas 78757 USA 512-463-8399 512-463-7274 richard.arnold@tnris.state.tx.us mpavon@bic.state.tx.us 9 - 5 e-mail contact is preferred FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile en {2C805D32-1B48-455B-B3A9-916725854C6D} 20070516 16504600 FALSE 20240228 21581000 20240228 21581000 FAFDS 002 874915.456356 2118038.809065 6861680.001991 8037682.006030 1 162.956 Projected GCS_North_American_1983 Linear Unit: Meter (1.000000) All_sids_albers <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/3.2.0'><WKT>PROJCS["All_sids_albers",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Albers"],PARAMETER["False_Easting",1500000.0],PARAMETER["False_Northing",6000000.0],PARAMETER["Central_Meridian",-100.0],PARAMETER["Standard_Parallel_1",27.5],PARAMETER["Standard_Parallel_2",35.0],PARAMETER["Latitude_Of_Origin",18.0],UNIT["Meter",1.0]]</WKT><XOrigin>-17170300</XOrigin><YOrigin>-691300</YOrigin><XYScale>10000</XYScale><ZOrigin>0</ZOrigin><ZScale>1</ZScale><MOrigin>0</MOrigin><MScale>1</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision></ProjectedCoordinateSystem> Esri ArcGIS 13.2.2.49743 FAFDS 874915.440309 2118038.823739 8037681.996767 6861680.007064 1 -106.950042 -93.128094 36.464552 25.706588 1 1 -106.950042 -93.128094 36.464552 25.706588 ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 dataset 002 withheld Local Area Network 0.000 Shapefile Enterprise Geodatabase Feature Class 162.956 All_sids_albers 0 20240228