MapFldHazAr (Flood Hazard Polygons), Davidson County, NC, 2007

North Carolina Floodplain Mapping Program, North Carolina Division of Emergency Management 200709 MapFldHazAr (Flood Hazard Polygons), Davidson County, NC, 2007 vector digital data Raleigh, NC North Carolina Floodplain Mapping Program, North Carolina Division of Emergency Management MAPFLDHAZAR withheld MapFldHazAr is a GIS shapefile representing the area within the flood mapping boundaries defined by the engineering models for the 100 year, 500 year and floodway. The MapFldHazAr spatial table contains information about the flood hazard within the study area. These zones are used by FEMA to designate the Special Flood Hazard Area (SFHA), identify areas of coastal high hazard flooding, and for insurance rating purposes. These data are the flood hazard areas that are or will be depicted on the FIRM. These data were collected and derived by the North Carolina Floodplain Mapping Program (www.ncfloodmaps.com) as part of its effort to modernize FEMA Flood Insurance Rate Maps (FIRM) statewide. The North Carolina Floodplain Mapping Program was established through a Cooperating Technical State (CTS) agreement with FEMA in response to the extensive damage caused by Hurricane Floyd in 1999. en 200709 publication date Complete As needed -80.788229 -80.290426 35.557504 35.181223 1559077.265625 1691458.520833 640494.354167 830851.697917 None Map Flood Hazard Area Floodplain Boundaries 100 Year Flood 500 Year Flood 1% annual chance flood hazard 0.2% annual chance flood hazard DFIRM Digital Flood Insurance Rate Map FIRM Flood Insurance Rate Map Floodway Riverine flooding Special Flood Hazard Area Coastal flooding North Carolina Atlas & Gazetteer (Yarmouth, Maine: DeLorme, 2001). Davidson County, Town of Denton, Town of Denton Extraterritorial Jurisdiction, City of High Point, City of Lexington, City of Thomasville, Town of Walburg, North Carolina None These data were created with the highest consideration of accuracy and data integrity. However, as with all other geospatial datasets, users must take into consideration the consequences of using the data for specific applications, business processes, decisions, and map display. For example, surface conditions may have changed in some areas since the initial data was captured. A full metadata record is provided to help the user understand the date, map scale and accuracy standard applied in the collection and data development process. The data should not be used without full review and comprehension of the metadata. Acknowledgement of the North Carolina Floodplain Mapping Program is appreciated when using the data set. Data further derived from this data set should be fully documented using the federal metadata standard and listed via the NC Geospatial Data Clearinghouse. North Carolina Floodplain Mapping Program, NC DEM John Dorman Director physical address

1812 Tillery Place, Suite 105

Raleigh NC 27604 919-715-5711 919-715-0408 ESRI ArcCatalog 9.3.1.3500 Federal Emergency Management Agency Unknown Unknown Flood Insurance Study, DAVIDSON COUNTY, NC document Washington, DC FEMA withheld Federal Emergency Management Agency Unknown Unknown Flood Insurance Study, DAVIDSON COUNTY, NC raster digital data Washington, DC FEMA withheld Federal Emergency Management Agency Unknown Unknown Flood Insurance Study, DAVIDSON COUNTY, NC map Washington, DC FEMA withheld Personal GeoDatabase Feature Class None None Watershed Concepts 200708 MapFldHazAr Feature class 200708 publication date STUDY4 For streams restudied by detailed and limited detail methods, the 1% and 0.2% annual chance floodplains were 0using flood elevations determined at each cross section. Between cross sections, the boundaries were interpolated using topographic data acquired using airborne LIDAR. This LIDAR data was acquired during the winter 2000-2001 flying season. The topographic data satisfies a vertical root-mean-square error (RMSE) accuracy standard of 20cm (1.3 feet accuracy at the 95% confidence limit) for the Outer Banks and 25 cm (1.6 feet accuracy at the 95% confidence limit) for those portions of the basin lying west of the Outer Banks. These data could be contoured at roughly a 2-foot vertical contour interval. All elevations were referenced to the NAVD 88 and reflect orthometric heights. Variably spaced, bare-earth digital topographic data in ASCII point file format were combined with imagery (either flown concurrently with the LIDAR data or using existing digital orthophotos) to establish a Triangulated Irregular Network (TIN) of digital elevation points, which include selected breaklines to be used for hydraulic modeling. Furthermore, a uniformly spaced sampling of the TIN resulted in uniformly spaced Digital Elevation Models (DEMs), with 20 ft x 20 ft post spacing, which was generated in multiple file formats. For coastal floodplains, after analyzing wave heights along each transect, wave elevations were interpolated between transects. Various source data were used in the interpolation, including topographic data described above. Controlling features affecting the elevations were identified and considered in relation to their positions at particular transect and their variation between transects. The 1% annual chance floodplain boundary corresponds to the boundary of the areas of special flood hazards (Zones VE, AO, AH, A99, AR, A, and AE), and the 0.2% annual chance floodplain boundary corresponds to the boundary of areas of moderate flood hazards. In cases where the 1% and 0.2% annual chance floodplain boundaries are close together, only the 1% annual chance floodplain boundaries have been shown. The floodways were computed for certain stream segments on the basis of equal conveyance reduction from each side of the floodplain. Floodway widths were computed at cross sections. Between cross sections, the floodway boundaries were interpolated. The computed floodway is shown on the FIRM. In cases where the floodway and 1% annual chance floodplain boundaries are either close together or collinear, only the floodway boundary is shown. For streams restudied by detailed and limited detail methods, the 1% and 0.2% annual chance floodplains were delineated using flood elevations determined at each cross section. Between cross sections, the boundaries were interpolated using topographic data acquired using airborne LIDAR. This LIDAR data was acquired during the winter 2000-2001 flying season. The topographic data satisfies a vertical root-mean-square error (RMSE) accuracy standard of 20cm (1.3 feet accuracy at the 95% confidence limit) for the Outer Banks and 25 cm (1.6 feet accuracy at the 95% confidence limit) for those portions of the basin lying west of the Outer Banks. These data could be contoured at roughly a 2-foot vertical contour interval. All elevations were referenced to the NAVD 88 and reflect orthometric heights. Variably spaced, bare-earth digital topographic data in ASCII point file format were combined with imagery (either flown concurrently with the LIDAR data or using existing digital orthophotos) to establish a Triangulated Irregular Network (TIN) of digital elevation points, which include selected breaklines to be used for hydraulic modeling. Furthermore, a uniformly spaced sampling of the TIN resulted in uniformly spaced Digital Elevation Models (DEMs), with 20 ft x 20 ft post spacing, which was generated in multiple file formats. For coastal floodplains, after analyzing wave heights along each transect, wave elevations were interpolated between transects. Various source data were used in the interpolation, including topographic data described above. Controlling features affecting the elevations were identified and considered in relation to their positions at particular transect and their variation between transects. The 1% annual chance floodplain boundary corresponds to the boundary of the areas of special flood hazards (Zones VE, AO, AH, A99, AR, A, and AE), and the 0.2% annual chance floodplain boundary corresponds to the boundary of areas of moderate flood hazards. In cases where the 1% and 0.2% annual chance floodplain boundaries are close together, only the 1% annual chance floodplain boundaries have been shown. The floodways were computed for certain stream segments on the basis of equal conveyance reduction from each side of the floodplain. Floodway widths were computed at cross sections. Between cross sections, the floodway boundaries were interpolated. The computed floodway is shown on the FIRM. In cases where the floodway and 1% annual chance floodplain boundaries are either close together or collinear, only the floodway boundary is shown. Unknown Metadata imported. Metadata imported. withheld Metadata imported. withheld Metadata imported. withheld 20070524 09555000 Vector Simple FALSE 0 FALSE FALSE coordinate pair 0.005208 0.005208 survey feet North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 GCS_North_American_1983 NAD_1983_StatePlane_North_Carolina_FIPS_3200_Feet 0.000010 Explicit elevation coordinate included with horizontal coordinates Flood2009 Polygon Geometry file that is the physical representation of the Flood Mapping Boundaries that are calculated from the Engineering Models Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) Feature Class 0 HYDROID A code that provides a link to the hydrologic model table, L_HYDROMODEL Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) Null A code that provides a link to the hydrologic model table, L_HYDROMODEL Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) HYDROID String 25 0 0 ZONE_LID Flood zone lookup identification Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) D_ZONE Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) ZONE_LID String 5 0 0 Shape Feature geometry. ESRI Polygon Polygons represent area features and are made up of arcs which define the boundary. ESRI FLDWAY_LID String 5 0 0 FLDWAY_LID Floodway lookup identification Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) D_FLOODWAY Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) SFHA_TF SmallInteger 2 5 0 SFHA_TF Is this a special flood hazard area? 0=False, 1=True Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) True or false Is this a special flood hazard area? 0=False, 1=True Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) V_DATM_LID String 5 0 0 V_DATM_LID Vertical Datum lookup identification Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) D_V_DATUM Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) DEPTH Double 8 38 8 DEPTH Depth value. For AO zones, shown beneath the zone label on the FIRM. Usually a whole number between 1 - 3 feet. Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) -9999 Depth value. For AO zones, shown beneath the zone label on the FIRM. Usually a whole number between 1 - 3 feet. Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) LEN_LID String 5 0 0 LEN_LID Units of linear measure Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) D_LENGTH_UNITS Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) VEL_LID String 5 0 0 VEL_LID Velocity measurement. For alluvial fan areas. Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) D_VELOCITY_UNITS Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) METAID String 25 0 0 METAID Foreign key to METADATA Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) 37057200707188 Foreign key to METADATA Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) FLD_AR_ID String 25 0 0 FLD_AR_ID Primary key. Defined by mapping contractor using the formula STFIPS + COFIPS + DATE + SEQUENTIAL NUMBER (where date = YYYYMMDD) Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) 37057200709251 3705720070925895 AR_REVERT String 6 0 0 AR_REVERT If the area is a ZONE AR, this field would hold the zone the area would revert to if the AR was removed Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) NULL If the area is a ZONE AR, this field would hold the zone the area would revert to if the AR was removed Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) CST_MDL_ID String 25 0 0 CST_MDL_ID Foreign key to L_CSTMODEL table Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) NULL Foreign key to L_CSTMODEL table Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) BFE_REVERT Double 8 38 8 BFE_REVERT If the area is a ZONE AR, this field would hold the static base flood elevation for the reverted zone. Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) NULL If the area is a ZONE AR, this field would hold the static base flood elevation for the reverted zone. Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) DEP_REVERT Double 8 38 8 DEP_REVERT If the area is a ZONE AR, this field would hold that flood depth for the reverted zone. Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) NULL If the area is a ZONE AR, this field would hold that flood depth for the reverted zone. Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) STATIC_BFE Double 8 38 8 STATIC_BFE Static base flood elevation Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) -9999 Static base flood elevation Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) VELOCITY Double 8 38 8 VELOCITY Velocity measurement. For alluvial fan areas. Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) -9999 Velocity measurement. For alluvial fan areas. Geodatabase Design (State of North Carolina, North Carolina Floodplain Mapping Program, 2007) Sequential unique whole numbers that are automatically generated. OBJECTID OID 4 10 0 OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Geometry 4 0 0 Shape.len Shape.area Double 0 0 0 Feature geometry. Esri Coordinates defining the features. SHAPE Feature geometry. ESRI Coordinates defining the features. Shape.len Double 0 0 0 North Carolina Center for Geographic Information and Analysis Production Services mailing and physical address

301 N. Wilmington Street, Suite 700

Raleigh NC 27601-2825 USA (919) 733-2090 (919) 715-0725 dataq@ncmail.net 8:30 AM to 5:30 PM EST Phone and email preferred. For current price information visit www.cgia.state.nc.us/cost.html Downloadable Data NCCGIA is charged with the development and maintenance of the State's corporate geographic database and, in cooperation with other mapping organizations, is committed to offering its users accurate, useful, and current information about the state. Although every effort has been made to ensure the accuracy of information, errors and conditions originating from physical sources used to develop the corporate database may be reflected in the data supplied. The client must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors, original map scale, collection methodology, currency of data, and other conditions specific to certain data. NCCGIA does not support secondary distribution of this data. The use of trade names or commercial products does not constitute their endorsement by the NCCGIA or North Carolina State Government. ASCII polygon dataset and metadata PC-based PKZip compatible products (WinZip, unzip) may be used to decompress the dataset. 2.0-4.0 MB withheld For current price information visit www.cgia.state.nc.us/cost.html Custom data creation and analysis work is available by contract. Contact Production Services at (919) 733-2090. Data are supplied in ArcInfo and ASCII formats. Format compatibility is the user's responsibility. For more information visit www.cgia.state.nc.us/cost.html. 20100315 Watershed Concepts David Key Project Manager mailing and physical address

3333 Regency Parkway, Suite 120

Cary NC 27518 919-460-6895 919-460-6896 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile en {BE54170A-CB4E-41B4-AC36-A57132FEB9C0} 20070524 09555000 FALSE 20131106 15444800 20131106 15444800 Flood2009 002 1559077.265625 1691458.520833 640494.354167 830851.697917 1 Projected GCS_North_American_1983 Linear Unit: Foot_US (0.304801) NAD_1983_StatePlane_North_Carolina_FIPS_3200_Feet <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/10.1'><WKT>PROJCS["NAD_1983_StatePlane_North_Carolina_FIPS_3200_Feet",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["Lambert_Conformal_Conic"],PARAMETER["False_Easting",2000000.002616666],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-79.0],PARAMETER["Standard_Parallel_1",34.33333333333334],PARAMETER["Standard_Parallel_2",36.16666666666666],PARAMETER["Latitude_Of_Origin",33.75],UNIT["Foot_US",0.3048006096012192],AUTHORITY["EPSG",2264]]</WKT><XOrigin>-121841899.99999982</XOrigin><YOrigin>-93658999.999999866</YOrigin><XYScale>3072.000000000005</XYScale><ZOrigin>0</ZOrigin><ZScale>1</ZScale><MOrigin>0</MOrigin><MScale>1</MScale><XYTolerance>0.020833333333333301</XYTolerance><ZTolerance>2.0000000000000002e-005</ZTolerance><MTolerance>2.0000000000000002e-005</MTolerance><HighPrecision>true</HighPrecision><WKID>102719</WKID><LatestWKID>2264</LatestWKID></ProjectedCoordinateSystem> Esri ArcGIS 10.1.1.3143 Flood2009 1559077.265625 1691458.520833 830851.697917 640494.354167 1 -80.491108 -80.03674 36.028382 35.500828 1 1 -80.491108 -80.036740 36.028382 35.500828 ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 dataset 002 withheld Local Area Network Personal GeoDatabase Feature Class Feature Class NAD_1983_StatePlane_North_Carolina_FIPS_3200_Feet EPSG 7.11.2 0 20131106