20221122 14114100 1.0 FGDC CSDGM Metadata FALSE vanc_nwi_Oct2021_drainages_2022_Final_11_11_2022_wm 0.000 -9312815.585500 -8376395.903600 4116478.287500 4786445.590900 1 002 Projected GCS_WGS_1984 Linear Unit: Meter (1.000000) <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/10.8'><WKT>PROJCS[&quot;WGS_1984_Web_Mercator_Auxiliary_Sphere&quot;,GEOGCS[&quot;GCS_WGS_1984&quot;,DATUM[&quot;D_WGS_1984&quot;,SPHEROID[&quot;WGS_1984&quot;,6378137.0,298.257223563]],PRIMEM[&quot;Greenwich&quot;,0.0],UNIT[&quot;Degree&quot;,0.0174532925199433]],PROJECTION[&quot;Mercator_Auxiliary_Sphere&quot;],PARAMETER[&quot;False_Easting&quot;,0.0],PARAMETER[&quot;False_Northing&quot;,0.0],PARAMETER[&quot;Central_Meridian&quot;,0.0],PARAMETER[&quot;Standard_Parallel_1&quot;,0.0],PARAMETER[&quot;Auxiliary_Sphere_Type&quot;,0.0],UNIT[&quot;Meter&quot;,1.0],AUTHORITY[&quot;EPSG&quot;,3857]]</WKT><XOrigin>-20037700</XOrigin><YOrigin>-30241100</YOrigin><XYScale>10000</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>102100</WKID><LatestWKID>3857</LatestWKID></ProjectedCoordinateSystem> WGS_1984_Web_Mercator_Auxiliary_Sphere 20221122 16432800 20221122 16432800 150000000 5000 FGDC Tamia Rudnicky Virginia Institute of Marine Science GIS Programmer/Analyst P.O. Box 1346 Gloucester Point Virginia 23062 File Geodatabase Feature Class Virginia and APNEP Portion of North Carolina NWI Nontidal Wetlands Drainages 2016-02-15T00:00:00 Kirk Havens Virginia Institute of Marine Science Assistant Director of Center for Coastal Resources Management P.O. Box 1346 Gloucester Point Virginia 23062 kirk@vims.edu (804) 684-7386 To create drainage basins for each NWI nontidal wetland. Drainages are used in the assessment of a wetland's ability to perform habitat and water quality functions. <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This dataset displays the drainages for each National Wetlands Inventory (NWI) non-tidal wetland in Virginia and the Albemarle-Pamlico National Estuary Partnership (APNEP) management area. Drainages were created using the National Elevation Dataset (NED) one third arc second raster datasets.</SPAN></P></DIV></DIV></DIV> Virginia North Carolina NWI nontidal wetland drainages NWI non-tidal wetland drainages Virginia, APNEP, North Carolina Kirk Havens Virginia Institute of Marine Science Assistant Director of Center for Coastal Resources Management P.O. Box 1346 Gloucester Point Virginia 23062 kirk@vims.edu (804) 684-7386 Kirk Havens Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.0.12790 1 -83.658446 -75.246445 39.450755 34.650440 <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>These data should not be used for jurisdictional permit determinations beyond providing general condition or status information. These data have not been surveyed to property boundaries. </SPAN></P></DIV></DIV></DIV> NWI non-tidal wetlands 12000 Wetlands and Deepwater Habitats of the United States Classification of Wetlands and Deepwater Habitats of the United States. U.S. Department of the Interior, Fish and Wildlife Service, Washington, DC. FWS/OBS-79/31. U.S. Fish and Wildlife Service http://www.fws.gov/wetlands/Data/Mapper.html NWI data was downloaded October 2021 from https://www.fws.gov/program/national-wetlands-inventory/data-download https://www.fws.gov/program/national-wetlands-inventory/data-download elevation data to create drainages for each wetland. USGS National Elevation Data 1/3 Arc Second 2009-01-01T00:00:00 U.S. Geological Survey, Sioux Falls, SD (1999-2009) 10 digit hydrologic units The Virginia Portion of the National Watershed Boundary Dataset (NWBD) 2009-09-15T00:00:00 Federal form of version 4 of the NWBD sixth order units for Virginia. hydrologic units VA NWBD Originator: Virginia Dept of Conservation and Recreation (VADCR), Division of Soil and Water Conservation (DSWC) Richmond, Virginia Wetland drainages are generated using elevation data from the United States Geological Survey. The wetlands and the elevation datasets are processed ArcGIS Pro; the elevation dataset is in a raster format and the wetlands are in ESRI shapefile format. The hydrologic tools available in ArcGIS Pro are used to create the watersheds. First, the isolated sinks in the elevation data are filled. These sinks are localized depressions in the elevation data, which are assumed to be anomalies. The new elevation data is used to generate a flow direction raster; the flow direction raster assigns numeric values to individual cells in the raster based on the flow direction in that cell. Finally, each wetland must be converted into a raster, and a watershed raster is generated around it from the flow direction raster. The resulting watershed is than converted to a polygon. Attributes are added that will link it to the associated wetland. Dates: 2022 2022-09-02T00:00:00 The 10 digit hydrologic unit (HUC10) boundaries dataset was used to clip the Virginia and North Carolina wetlands data (NWI). Date: 2022 2022-09-01T00:00:00 Wetland drainages are merged into one geodatabase feature class. Each drainage has a unique identification that ties it back to the non-tidal wetland. 2022-11-11T00:00:00 EPSG 8.8(9.3.1.2) vanc_nwi_Oct2021_drainages_2022_Final_11_11_2022_wm Feature Class 450639 A collection of geographic features with the same geometry type (such as point, line, or polygon), the same attributes, and the same spatial reference. ESRI OBJECTID OBJECTID OID 4 0 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Shape Geometry 0 0 0 Feature geometry. Esri Coordinates defining the features. ATTRIBUTE ATTRIBUTE String 20 0 0 Alphanumeric code identifying the wetland classification of the polygon. http://www.fws.gov/wetlands/Data/Wetland-Codes.html HUC10 HUC10 String 10 0 0 10-digit hydrologic code National Watershed Boundary dataset anewID anewID Integer 4 0 0 DelinType DelinType String 50 0 0 AnalysisID AnalysisID Integer 4 0 0 A unique identifier for each nwi nontidal wetland. This code is used to link the wetland to its drainage polygon(s). This identifier was generated by the processor and is not a code frm NWI. processor NWI_CLASS NWI_CLASS String 10 0 0 same as the Attribute field processor Shape_Length Shape_Length Double 8 0 0 Length of feature in internal units. Esri Positive real numbers that are automatically generated. Shape_Area Shape_Area Double 8 0 0 Area of feature in internal units squared. 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