State of Delaware Department of Natural Resources and Environmental Control 2011 SWMP2007 Wetlands vector digital data Dover, DE DNREC withheld DE_Wetlands The USFWS and the State of Delaware contracted with the CMI to complete an updated and enhanced version of the existing NWI and SWMP for Kent, New Castle and Sussex Counties in Delaware. The area encompasses approximately 54 full and partial USGS quadrangles. This work involved updating the current existing NWI and SWMP data using more recent 2007 imagery, as well as including enhanced wetland data in the form of Landscape, Landform, Water flow path, and Water body type (LLWW; Tiner 2003). Wetlands were classified using Cowardin et al. (1979) and Delaware specific modifiers for rare, unique, and locally significant wetlands.Wetlands listed in the *Attribute* column are classified using the above referenced Cowardin system, where some wetland polygons have an 'H' modifier preceding their classification. These wetlands are known as 'Hwetlands' and consist of hydric soils having natural vegetation but lacking a photointerpretable wet signature. Hwetlands have the dominant soil type from SSURGO listed in the *musym* attribute column. This designation does not imply the lack of hydrology to qualify as wetland, only that during the mapping exercise no wet signature was evident and could be due to dense evergreen vegetation, lack of normal rainfall or groundwater at the time of photography, being artificially drained, etc. Hwetland polygons require localized verification on site to determine wetland extent. Landscape level functional assessment conducted during this mapping evaluated 11 separate functions. Wetlands were rated as either High or Moderate where appropriate for 8 of the 11 for functions: Bank and Shoreline Stabilization (BSS); Carbon Sequestration (CAR); Coastal Storm Surge Detention (CSS); Nutrient Transformation (NT); Other Wildlife Habitat (OWH); Streamflow Maintenance (SM); Sediment Retention (SR); and Surface Water Detention (SWD). Fish and Aquatic Invertebrate Habitat (FAIH) recieved a designation of High, Moderate, or Stream where appropriate. Provision for Waterfowl and Waterbird Habitat (WBIRD) received a designation of High or WoodDuck where appropriate. Provision for Unique, Uncommon, or Highly Diverse Wetland Plant Communities (UWPC) received a designation of Region where appropriate.Wetlands listed in the *DE_Modifier* column are those polygons where a special Delaware modifier(s) has been added to reference unique ecological communities that may harbor rare, threatened or endangered (RTE) plants and animals. Some wetland polygons may have more than one Delaware modifier designation. These numeric codes and their associated ecological community types are: (2)Delaware Coastal Plain Seasonal Pond; (3)Atlantic White Cedar; (4)Bald Cypress; (5)Interdunal Swale; (6)Acidic Fen; (12)Groundwater Seepage Wetland (Black Ash, Amphibian, and/or Stream). Adjacent wetland polygons or wetland polygons with the potential to harbor RTE's may have been tagged as part of the mapping process. For more information on these modifiers, please contact the Delaware Natural Heritage and Endangered Species Program at 302-739-9124. The Conservation Management Institute (CMI) has updated the existing USFWS National Wetlands Inventory (NWI) and Delaware Statewide Wetland Mapping Project (SWMP) data to meet or exceed NWI procedures and the guidelines of the Federal Geographic Data Committee's Wetland Mapping Standard (document FGDC-STD-015-2009) employing heads-up photo interpretation in a softcopy environment. We identified wetlands with a minimum mapping unit (MMU) of 0.5 acres with smaller, highly recognizable polygons (e.g., ponds) mapped down to approximately 0.10 acres. Photo interpreters (PIs) identified the wetland targets at a scale of approximately to 1:10,000 with delineations completed at 1:5,000 and, occasionally, larger as necessary. Polygons were then attributed with a code corresponding to the existing NWI classification scheme (Cowardin et al. 1979) and Delaware specific modifiers, where applicable. The update was completed in ESRI's ArcGIS 9.3.x using 2007 Color Infrared, obtained from the State of Delaware. All spatial and classification changes were made manually using standard photogrammetric techniques. When it was necessary to use ancillary datasets to aid in decisions, PIs would consult one or more of the following: Soil Survey Geographic Database (SSURGO), 1992 color infrared, National Hydrography Dataset (NHD), National Elevation Dataset (NED), NWI, and USGS Topographic maps. After we completed the delineation and attribution of the wetland polygons, datasets were inspected through an in-house quality control process for spatial, classification, and topologic errors before being sent to the U.S. Fish and Wildlife Service (USFWS) and the State of Delaware for final review and corrections. Additionally, the wetlands layer was run through the USFWS verification tool to further ensure the accuracy of polygons and the codes assigned to them. CMI completed the LLWW classification following guidelines provided by the USFWS. These classifications were derived from the Cowardin code, NHD, topography, and spatial relationships between wetlands. We assigned the initial codes based through a largely automated process. Where applicable, this process uses the Cowardin codes to attribute Landscape and Water body type. The next step largely uses water regime and spatial relationships to attribute Landform. We then manually attributed the NHD to assign Water flow. We manually reviewed the dataset and modified the attributes to create a correct and logical dataset. As the automated classification tends to use too fine a scale, we completed the finer step at a smaller scale than the initial classification in consultation with the Fish and Wildlife Service and the State of Delaware. Delaware modifiers are based off spatial data and guidance provided by DNREC. Wetland functional analysis was performed in consultation with Dr. Ralph Tiner of the USFWS. http://www.nav.dnrec.delaware.gov/dnreceis/downloads/swmpcodes.pdf en Spring, 2007 Spring, 2007 ground condition Complete Irregular -76.120464 -74.681844 39.870836 38.357935 1704143.753906 1796588.338125 1901531.915000 2054802.483438 GNIS Kent County Sussex County Newcastle County Delaware Wetlands, Environment, inland waters, SWMP, marsh, swamp, NWI None Use of this information is for guidance purposes only and is subject to change or modification at any time. Use of this information by others is at the own risk and the DNREC in no way guarantees the accuracy of this information. Mark Biddle Delaware DNREC, Watershed Assessment Section Environmental Scientist mailing and physical address
820 Silver Lake Blvd. Suite 220
Dover Delaware 19904 USA (302) 739-9939 (302) 739-6140 mark.biddle@state.de.us 8am - 4:30pm ET ESRI ArcCatalog 9.3.1.3000 Personal GeoDatabase Feature Class Completed Headsup delineation at 1:5000 Reviewe at 1:10000 for consistency, quality and accuracy Fish and Wildlife Verification Tools were run to detect errors. Metadata imported. withheld 20110119 09115400 Metadata imported. withheld 20110223 14201500 Vector Simple FALSE 0 TRUE FALSE coordinate pair 0.000156 0.000156 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 GCS_North_American_1983 NAD_1983_Albers 0.000100 Explicit elevation coordinate included with horizontal coordinates ENV_Saltwater_Tidal_Buffer Feature Class 0 OBJECTID OBJECTID OID 4 10 0 Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. SHAPE Geometry 8 0 0 Shape.area SHAPE.AREA Double 0 0 0 Shape.len SHAPE.LEN Double 0 0 0 Downloadable Data zip 13.307 http://www.nav.dnrec.delaware.gov/dnreceis/downloads/zip/filename.zip None Online Download 20111208 Kevin McGuckin Conservation Management Institute, Virginia Tech GIS Project Manager mailing and physical address
1900 Kraft Dr., Suite 250
Blacksburg Virginia 24061 540-231-9197 kmcguckn@vt.edu 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 en 20220121 14204500 FALSE 20210330 09493400 20250903 14300300 ENV_Saltwater_Tidal_Buffer 002 0.000 168057.208552 232161.379311 50174.724083 204159.467157 1 Projected GCS_North_American_1983 Linear Unit: Meter (1.000000) NAD_1983_StatePlane_Delaware_FIPS_0700 <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/2.7.0'><WKT>PROJCS[&quot;NAD_1983_StatePlane_Delaware_FIPS_0700&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;Transverse_Mercator&quot;],PARAMETER[&quot;False_Easting&quot;,200000.0],PARAMETER[&quot;False_Northing&quot;,0.0],PARAMETER[&quot;Central_Meridian&quot;,-75.41666666666667],PARAMETER[&quot;Scale_Factor&quot;,0.999995],PARAMETER[&quot;Latitude_Of_Origin&quot;,38.0],UNIT[&quot;Meter&quot;,1.0],AUTHORITY[&quot;EPSG&quot;,26957]]</WKT><XOrigin>-5423100</XOrigin><YOrigin>-14209500</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><WKID>26957</WKID><LatestWKID>26957</LatestWKID></ProjectedCoordinateSystem> 1.0 FGDC 5000000 5000 Esri ArcGIS 12.7.0.26828 Saltwater Tidal Buffer Mark Biddle Delaware Department of Natural Resources and Environmental Control (DNREC), Division of Watershed Stewardship Environmental Scientist 820 Silver Lake Blvd. Suite 220 Dover Delaware 19904 mark.biddle@state.de.us USA 302-739-9939 302-739-6140 http://www.dnrec.delware.gov/admin/delawarewetlands SWMP2007 Wetlands SWMP2007 Wetlands Statewide Wetlands Mapping Project (SWMP) 2007. Delaware Department of Natural Resources and Environmental Control. Dover, DE. 2011. SWMP2007 Wetlands 20110901 20111201 20110901 20111201 20111201 -75.789854 -75.040925 39.839052 38.451444 1 -76.120464 -74.681844 39.870836 38.357935 1 Coastal saltwater areas in Delaware <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>SWMP2007 Wetlands</SPAN></P><P><SPAN>The Conservation Management Institute (CMI) has updated the existing USFWS National Wetlands Inventory (NWI) and Delaware Statewide Wetland Mapping Project (SWMP) data to meet or exceed NWI procedures and the guidelines of the Federal Geographic Data Committee's Wetland Mapping Standard (document FGDC-STD-015-2009) employing heads-up photo interpretation in a softcopy environment. We identified wetlands with a minimum mapping unit (MMU) of 0.5 acres with smaller, highly recognizable polygons (e.g., ponds) mapped down to approximately 0.10 acres. Photo interpreters (PIs) identified the wetland targets at a scale of approximately to 1:10,000 with delineations completed at 1:5,000 and, occasionally, larger as necessary. Polygons were then attributed with a code corresponding to the existing NWI classification scheme (Cowardin et al. 1979) and Delaware specific modifiers, where applicable. The update was completed in ESRI's ArcGIS 9.3.x using 2007 Color Infrared, obtained from the State of Delaware. All spatial and classification changes were made manually using standard photogrammetric techniques. When it was necessary to use ancillary datasets to aid in decisions, PIs would consult one or more of the following: Soil Survey Geographic Database (SSURGO), 1992 color infrared, National Hydrography Dataset (NHD), National Elevation Dataset (NED), NWI, and USGS Topographic maps. After we completed the delineation and attribution of the wetland polygons, datasets were inspected through an in-house quality control process for spatial, classification, and topologic errors before being sent to the U.S. Fish and Wildlife Service (USFWS) and the State of Delaware for final review and corrections. Additionally, the wetlands layer was run through the USFWS verification tool to further ensure the accuracy of polygons and the codes assigned to them. CMI completed the LLWW classification following guidelines provided by the USFWS. These classifications were derived from the Cowardin code, NHD, topography, and spatial relationships between wetlands. We assigned the initial codes based through a largely automated process. Where applicable, this process uses the Cowardin codes to attribute Landscape and Water body type. The next step largely uses water regime and spatial relationships to attribute Landform. We then manually attributed the NHD to assign Water flow. We manually reviewed the dataset and modified the attributes to create a correct and logical dataset. As the automated classification tends to use too fine a scale, we completed the finer step at a smaller scale than the initial classification in consultation with the Fish and Wildlife Service and the State of Delaware. Delaware modifiers are based off spatial data and guidance provided by DNREC. Wetland functional analysis was performed in consultation with Dr. Ralph Tiner of the USFWS.</SPAN></P><P><SPAN>The USFWS and the State of Delaware contracted with the CMI to complete an updated and enhanced version of the existing NWI and SWMP for Kent, New Castle and Sussex Counties in Delaware. The area encompasses approximately 54 full and partial USGS quadrangles. This work involved updating the current existing NWI and SWMP data using more recent 2007 imagery, as well as including enhanced wetland data in the form of Landscape, Landform, Water flow path, and Water body type (LLWW; Tiner 2003). Wetlands were classified using Cowardin et al. (1979) and Delaware specific modifiers for rare, unique, and locally significant wetlands.</SPAN></P><P><SPAN>Wetlands listed in the *Attribute* column are classified using the above referenced Cowardin system, where some wetland polygons have an 'H' modifier preceding their classification. These wetlands are known as 'Hwetlands' and consist of hydric soils having natural vegetation but lacking a photointerpretable wet signature. Hwetlands have the dominant soil type from SSURGO listed in the *musym* attribute column. This designation does not imply the lack of hydrology to qualify as wetland, only that during the mapping exercise no wet signature was evident and could be due to dense evergreen vegetation, lack of normal rainfall or groundwater at the time of photography, being artificially drained, etc. Hwetland polygons require localized verification on site to determine wetland extent. </SPAN></P><P><SPAN>Landscape level functional assessment conducted during this mapping evaluated 11 separate functions. Wetlands were rated as either High or Moderate where appropriate for 8 of the 11 for functions: Bank and Shoreline Stabilization (BSS); Carbon Sequestration (CAR); Coastal Storm Surge Detention (CSS); Nutrient Transformation (NT); Other Wildlife Habitat (OWH); Streamflow Maintenance (SM); Sediment Retention (SR); and Surface Water Detention (SWD). Fish and Aquatic Invertebrate Habitat (FAIH) received a designation of High, Moderate, or Stream where appropriate. Provision for Waterfowl and Waterbird Habitat (WBIRD) received a designation of High or WoodDuck where appropriate. Provision for Unique, Uncommon, or Highly Diverse Wetland Plant Communities (UWPC) received a designation of Region where appropriate.</SPAN></P><P><SPAN>Wetlands listed in the *DE_Modifier* column are those polygons where a special Delaware modifier(s) has been added to reference unique ecological communities that may harbor rare, threatened or endangered (RTE) plants and animals. Some wetland polygons may have more than one Delaware modifier designation. These numeric codes and their associated ecological community types are: (2)Delaware Coastal Plain Seasonal Pond; (3)Atlantic White Cedar; (4)Bald Cypress; (5)Interdunal Swale; (6)Acidic Fen; (12)Groundwater Seepage Wetland (Black Ash, Amphibian, and/or Stream). Adjacent wetland polygons or wetland polygons with the potential to harbor RTE's may have been tagged as part of the mapping process. For more information on these modifiers, please contact the Delaware Natural Heritage and Endangered Species Program at 302-739-9124.</SPAN></P><P><SPAN>Data is ENV_Saltwater_Tidal_Buffer Enterprise Geodatabase Feature Class made available from DNREC's Enterprise Geodatabase. </SPAN></P></DIV></DIV></DIV> SWMP2007 wetlands inland waters SWMP marsh environment inland water marsh SWMP swamp NWI DE Delaware FirstMap <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Use of this information is for guidance purposes only and is subject to change or modification at any time. Use of this information by others is at the own risk and the DNREC in no way guarantees the accuracy of this information.</SPAN></P></DIV></DIV></DIV> This data was created in partnership with funding from both the U.S. Fish and Wildlife Service, National Wetlands Inventory (NWI) and the Delaware Department of Natural Resources and Environmental Control (DNREC). Virginia Tech's Conservation Management Institute (CMI) is the project contractor. Lead contact: DNREC -- Mark Biddle (302-739-9939) mark.biddle@state.de.us Other Project Principals: USFWS, NWI -- Ralph Tiner Virginia Tech CMI -- Kevin McGuckin 002 Mark Biddle Delaware Department of Natural Resources and Environmental Control (DNREC), Division of Watershed Stewardship Environmental Scientist 820 Silver Lake Blvd. Suite 220 Dover Delaware 19904 mark.biddle@state.de.us USA 302-739-9939 302-739-6140 http://www.dnrec.delaware.gov/admin/delawarewetlands SWMP2007 Wetlands SWMP2007 Wetlands SWMP2007 Wetlands Wetlands, Environment, inland waters, SWMP, marsh, swamp, NWI SWMP2007 Wetlands SWMP2007 Wetlands Wetlands, Environment, inland waters, SWMP, marsh swamp, NWI ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 dataset Enterprise Geodatabase Feature Class 0.000 Mark Biddle Delaware Department of Natural Resources and Environmental Control (DNREC), Division of Watershed Stewardship Environmental Scientist 820 Silver Lake Blvd. Suite 220 Dover Delaware 19904 mark.biddle@state.de.us USA 302-739-9939 302-739-6140 http://www.dnrec.delaware.gov/admin/delawarewetlands SWMP2007 Wetlands NAD_1983_Albers EPSG 4.5(3.0.1) SWMP2007 Wetlands 0 20250903 Mark Biddle Delaware Department of Natural Resources and Environmental Control (DNREC), Division of Watershed Stewardship Environmental Scientist 820 Silver Lake Blvd, Suite 220 Dover Delaware 19904 mark.biddle@state.de.us USA 302-739-9939 302-739-6140 http://www.dnrec.delaware.gov/admin/delawarewetlands SWMP2007 Wetlands SWMP2007 Wetlands Originally published in Permitting and Monitoring map service.