North Carolina Floodplain Mapping Program, North Carolina Division of Emergency Management 200802 MAPBFE vector digital data withheld MAPBFE MapBFE is a GIS shapefile containing information about the Base Flood Elevations (BFE) within a study area. BFE lines indicate the approximate water surface elevation of the 1% annual chance flood hazard. 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 200802 publication date Complete As needed -82.680856 -82.113150 36.089289 35.169278 912458.114583 1069970.005208 536476.656250 866150.348958 None Base Flood Elevation Map Base Flood Elevation BFE Water surface elevation North Carolina Atlas & Gazetteer (Yarmouth, Maine: DeLorme, 2001). Yancey County, Burnsville, Green Mountain, Swiss, 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. Greenhorne & O'Mara, Inc. James Huffines Technical Director mailing and physical address
5565 Centerview Dr. Suite 107
Raleigh NC 27606 919-532-2332 919-851-8393 ESRI ArcCatalog 9.2.4.1420 Federal Emergency Management Agency Unknown Unknown Flood Insurance Study, YANCEY COUNTY, NC document Washington, DC FEMA withheld Federal Emergency Management Agency Unknown Unknown Flood Insurance Study, YANCEY COUNTY, NC raster digital data Washington, DC FEMA withheld Federal Emergency Management Agency Unknown Unknown Flood Insurance Study, YANCEY COUNTY, NC map Washington, DC FEMA withheld Personal GeoDatabase Feature Class None None Watershed Concepts 200802 MapBFE Shapefile 200802 publication date MapBFE For the streams studied by detailed methods, water-surface elevations of floods of the selected recurrence intervals were computed through use of the U.S. Army Corps of Engineers' HEC-RAS step-backwater computer program version 3.0 (USACE, 2001). The hydraulic analyses were based on unobstructed flow. The flood elevations shown on the profiles are thus considered valid only if hydraulic structures remain unobstructed, operate properly, and do not fail. The computer models were calibrated using historic high water data collected during field investigations. The cross section geometries were obtained from a combination of digital elevation data obtained using Light Detection and Ranging (LIDAR) data and field surveys. All bridges, dams, and culverts were field surveyed to obtain elevation data and structural geometry. Natural floodplain cross sections were surveyed approximately every 4000’ along the detail study reaches to obtain the channel geometry between bridges and culverts. Overbank cross-section data for the backwater analyses were obtained from recently flown LIDAR data. For flooding sources studied by limited detailed methods in the county, standard hydrologic and hydraulic study methods were used to determine the flood hazard data required for this report and the FIRM panels. This method entails developing a HEC-RAS hydraulic model, resulting in the calculation of BFEs and the delineation of the 1% annual chance floodplain (designated as Zone AE). Cross sections for the flooding sources studied by limited detailed methods were obtained using digital elevation data obtained with LIDAR technology developed as part of the North Carolina Statewide Floodplain Mapping Program. The hydraulic model is prepared using this digital elevation data, without surveying bathymetric or structural data. Where bridge or culvert data are readily available, such as from the North Carolina Department of Transportation, these data have been reflected in the hydraulic model. If these structural data are not readily available, field measurements of these structures were made to approximate their geometry in the hydraulic models. In addition, this method does not include field surveys that determine specifics on channel and floodplain characteristics. A limited detailed study is a "buildable" product that can be upgraded to a fully detailed study at a later date by verifying stream channel characteristics, bridge and culvert opening geometry, and by analyzing multiple recurrence intervals. Each jurisdiction within Yancey County had previously printed FIS Reports describing each community's hydraulic analyses. Those analyses have been compiled and are summarized below. These analyses remain valid for those flooding sources listed below under "Redelineated streams." For the streams studied by detailed methods, water-surface elevations of floods of the selected recurrence intervals were computed through use of the U.S. Army Corps of Engineers' HEC-RAS step-backwater computer program version 3.1.2 (USACE, 2001). The hydraulic analyses were based on unobstructed flow. The flood elevations shown on the profiles are thus considered valid only if hydraulic structures remain unobstructed, operate properly, and do not fail. The computer models were calibrated using historic high water data collected during field investigations. The cross section geometries were obtained from a combination of digital elevation data obtained using Light Detection and Ranging (LIDAR) data and USGS Quads and field surveys. All bridges, dams, and culverts were field surveyed to obtain elevation data and structural geometry. Surveyed cross sections are placed based off aerial photos and topographic data with a maximum of one cross section every mile along the detail study reaches to obtain the channel geometry between bridges and culverts. Overbank cross-section data for the backwater analyses were obtained from recently flown LIDAR data. For flooding sources studied by limited detailed methods in the county, standard hydrologic and hydraulic study methods were used to determine the flood hazard data required for this report and the FIRM panels. This method entails developing a HEC-RAS hydraulic model, resulting in the calculation of BFEs and the delineation of the 1% annual chance floodplain (designated as Zone AE). Cross sections for the flooding sources studied by limited detailed methods were obtained using digital elevation data obtained with LIDAR technology developed as part of the North Carolina Statewide Floodplain Mapping Program. The hydraulic model is prepared using this digital elevation data, without surveying bathymetric or structural data. Where bridge or culvert data are readily available, such as from the North Carolina Department of Transportation and NC Dam Safety, these data have been reflected in the hydraulic model. If these structural data are not readily available, field measurements of these structures were made to approximate their geometry in the hydraulic models. In addition, this method does not include field surveys that determine specifics on channel and floodplain characteristics. A limited detailed study is a "buildable" product that can be upgraded to a fully detailed study at a later date by verifying stream channel characteristics, bridge and culvert opening geometry, and by analyzing multiple recurrence intervals. Each jurisdiction within Yancey County, had previously printed FIS Reports describing each community's hydraulic analyses. Those analyses have been compiled and are summarized below. These analyses remain valid for those flooding sources listed below under "Redelineated streams." Unknown Metadata imported. withheld 20080225 Vector Simple FALSE 0 TRUE 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 Explicit elevation coordinate included with horizontal coordinates 0.000010 MAPBFE Base Flood Elevations NC-FMIS Database Design Review and Physical Model (State of North Carolina, North Carolina Floodplain Mapping Program, September 2002) Feature Class 0 Shape Feature geometry. ESRI Polyline A type of shape made up of two or more segments. ESRI Coordinates defining the features. MAPBFEID String 25 0 0 MAPBFEID LEN_LID String 5 0 0 LEN_LID V_DATM_LID String 5 0 0 V_DATM_LID ELEV Double 8 0 0 ELEV METAID String 25 0 0 METAID ObjectID OID 4 0 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. OBJECTID Geometry Geometry 0 0 0 Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE SHAPE_Length Double 8 0 0 Feature geometry. ESRI Coordinates defining the features. SHAPE_Length SHAPE_Length Double 8 0 0 Length of feature in internal units. ESRI Positive real numbers that are automatically generated. 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 line 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 20080225 Greenhorne & O'Mara, Inc. Kristel Whitson GIS Technician mailing and physical address
5565 Centerview Dr. Suite 107
Raleigh NC 27606 919-532-2331 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile en {EF5E2CD9-26A4-4B3A-BBEB-811A7F577C79} 20080225 13391900 FALSE 20220620 10153900 20220620 10153900 MAPBFE 002 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/10.6'><WKT>PROJCS[&quot;NAD_1983_StatePlane_North_Carolina_FIPS_3200_Feet&quot;,GEOGCS[&quot;GCS_North_American_1983&quot;,DATUM[&quot;D_North_American_1983&quot;,SPHEROID[&quot;GRS_1980&quot;,6378137.0,298.257222101]],PRIMEM[&quot;Greenwich&quot;,0.0],UNIT[&quot;Degree&quot;,0.0174532925199433]],PROJECTION[&quot;Lambert_Conformal_Conic&quot;],PARAMETER[&quot;False_Easting&quot;,2000000.002616666],PARAMETER[&quot;False_Northing&quot;,0.0],PARAMETER[&quot;Central_Meridian&quot;,-79.0],PARAMETER[&quot;Standard_Parallel_1&quot;,34.33333333333334],PARAMETER[&quot;Standard_Parallel_2&quot;,36.16666666666666],PARAMETER[&quot;Latitude_Of_Origin&quot;,33.75],UNIT[&quot;Foot_US&quot;,0.3048006096012192],AUTHORITY[&quot;EPSG&quot;,2264]]</WKT><XOrigin>-121841900</XOrigin><YOrigin>-93659000</YOrigin><XYScale>1536</XYScale><ZOrigin>-100000</ZOrigin><ZScale>8000</ZScale><MOrigin>-100000</MOrigin><MScale>8000</MScale><XYTolerance>0.010416666666666666</XYTolerance><ZTolerance>0.002</ZTolerance><MTolerance>0.002</MTolerance><HighPrecision>true</HighPrecision><WKID>102719</WKID><LatestWKID>2264</LatestWKID></ProjectedCoordinateSystem> Version 6.2 (Build 9200) ; Esri ArcGIS 10.6.1.9270 MAPBFE 912458.114583 1069970.005208 866150.348958 536476.65625 1 -82.680856 -82.11315 36.089289 35.169278 1 ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 dataset 002 withheld Local Area Network Personal GeoDatabase Feature Class File Geodatabase Feature Class NAD_1983_StatePlane_North_Carolina_FIPS_3200_Feet EPSG 6.12(9.0.0) 0 20220620