Jennifer L. Krstolic Sarah K. Martucci Katharine J. Hopkins Jeff P. Raffensperger 2005 vector digital data SIR 2005-5073 Baltimore, MD U.S. Geological Survey Spatial data associated with the Scientific Investigations Report, 'Development of Land Segmentation, Stream-Reach Network, and Watersheds in Support of Hydrological Simulation Program-Fortran (HSPF) Modeling, Chesapeake Bay Watershed, and Adjacent Parts of Maryland, Delaware, and Virginia' By Sarah K. Martucci, Jennifer L. Krstolic, and Jeff P. Raffensperger (U.S. Geological Survey), and Katharine J. Hopkins (University of Maryland Center for Environmental Science) http://water.usgs.gov/lookup/getspatial?sir2005-5073_CBRWM_watersheds This is an ArcGIS dataset depicting watershed segments in the Chesapeake Bay Watershed and adjacent states of New York, Pennsylvania, Maryland, West Virginia, Delaware, Virginia, North Carolina, and Tennessee. Thirty-meter-resolution Digital Elevation Model data were used to delineate watersheds for each stream reach. State watershed boundaries replaced the Digital Elevation Model-derived watersheds where coincident. The data are projected to the UTM grid coordinate system - Zone 18 NAD27. The U.S. Geological Survey, Chesapeake Bay Program, Interstate Commission on the Potomac River Basin, Maryland Department of the Environment, Virginia Department of Conservation and Recreation, and the University of Maryland are collaborating on the Chesapeake Bay Regional Watershed Model (CBRWM), using Hydrological Simulation Program - FORTRAN to simulate streamflow and concentrations and loads of nutrients and sediment. In order to establish a framework for model simulation, digital spatial datasets were created defining the discretization of the model region the (including the Chesapeake Bay Watershed, as well as the adjacent parts of Maryland, Delaware, Virginia, Tennessee, and North Carolina outside the watershed) into land segments, a stream-reach network, and associated watersheds. The stream-reach network for the Chesapeake Bay Watershed part of the model region was based on the USGS Chesapeake Bay SPARROW model stream-reach network. Since that network was created only for the Chesapeake Bay Watershed, the rest of the model region uses a 1:500,000-scale stream-reach network. To standardize watershed size, streams with mean annual streamflow of less than 100 cubic feet per second were excluded based on attributes from the dataset. Additional changes were made to enhance the data and to allow for inclusion of stream reaches with monitoring data that were not part of the original network. The watersheds were coded to indicate major and minor basin, mean annual streamflow, and each watershed's unique identifier as well as that of the downstream watershed. The watershed dataset represents the watershed areas included in the CBRWM. The derived product of the watersheds intersected with land segments serves as the model units. The watersheds are to be used with the CBRWM. Other uses are not suggested. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ARC/INFO format, this metadata file may include some ARC/INFO-specific terminology. Related websites: Chesapeake Bay Program Home: http://www.chesapeakebay.net/index.cfm Chesapeake Bay Program Modeling efforts: http://www.chesapeakebay.net/model.htm Chesapeake Bay Program work related to this GIS dataset: http://www.chesapeakebay.net/phase5.htm SPARROW Modeling and stream-reach network development http://md.water.usgs.gov/publications/wrir-99-4054/ Maryland Department of the Environment (MDE) http://www.mde.state.md.us/ Interstate Commission on the Potomac River Basin (ICPRB) http://www.potomacriver.org/ Virginia Department of Conservation and Recreation (DCR) http://www.dcr.state.va.us/ University of Maryland http://www.umd.edu/ 2005 publication date Complete As needed -84.464484 -74.577530 42.987273 35.921916 ISO19119 Topic Category inlandWaters environment farming biota none Watershed Topography elevation HSPF model Segmentation none Chesapeake Bay Watershed DE MD NC NY PA TN VA WV 2000-2005 none These watersheds are to be used with the Chesapeake Bay Regional Watershed Model or projects related to this work. The watershed areas are not USGS published drainage areas for stream gages. U.S. Geological Survey Ask USGS ? Water Webserver Team mailing and physical address

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Reston Virginia 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sir2005-5073_CBRWM http://water.usgs.gov/GIS/browse/SIR2005-5073_Cbshed.jpg Watershed segments of the Chesapeake Bay Regional Watershed Model JPEG Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535 Each attribute value within this coverage has been examined to ensure it contains quality information. Specific attributes that have been calculated from ancillary data are included, such as Up elevation, Down Elevation, stream length, and total upstream area. These attributes have accuracy values approximately in line with their data sources. Specific attributes of special concern are mentioned here. Others are defined in the "entity Attribute" section. PROV Physiographic Province. This attribute was assigned to each watershed from a 1:2 million province coverage. Watersheds which cross between two provinces were manually assigned to one province. These are for visualization and grouping only. They do not necessarily represent correct physiographic conditions in the watersheds. FLOW Flow is a value representing the relative size of the river in the watershed. The value of Flow is calculated from the mean monthly discharge which was recorded in the EPA RF3 enhanced stream coverage. The following formula was used to calculate the FLOW: Round(log10(mean Monthly Q) * 3 - 5) EXCEPTIONS: For segments that have a value equal to or less than zero for mean annual flow (MeanQ), the Flow term was set to zero. Some streams do not have MeanQ in the data base, they have 99999. These areas are all coastal or small headwater streams, so the Flow term was set to zero. For watersheds that do not have streams (DE, west corner MD, a few VA) the flow parameter was set to zero. STRM_LENG_M Stream Length in Meters. The stream network was intersected with the watershed coverage to attribute each river with the UNIQID for each watershed it flows through. Stream length was summarized for each watershed. Lengths are only calculated for watersheds that have modeled rivers. Reservoirs have no stream lengths, nor do watersheds with DSID= 0. Lengths were calculated while datasets were projected in Albers NAD83. Confluences of the stream coverage do not exactly match the watershed boundaries, in that some confluences meet downstream of a watershed boundary. This creates a little extra length in some watersheds where 'two' streams are present in stead of one. tot_UPAREA_m2 Total upstream area in square meters. The polygon area from the coverage was extracted and summed in a spreadsheet using the UNIQID and DSID relationship. This field represents the total upstream area including the area of the polygon being queried. Areas were calculated while dataset was projected in Albers NAD83. UP_Elev_M Up elevation meters. The lowest elevation in the stream channel at the upstream end of the watershed. Used in conjunction with the DN_elev_m and stream length to calculate channel slope. 30-meter National Elevation Data was used to gather elevation information. The elevation data is in meters with accuracy ranging from 1--15 meters. The DEM has the greatest error associated with low relief, such as in the coastal plain. DN_elev_M Down elevation meters. The lowest elevation in the stream channel at the downstream end of the watershed. Used in conjunction with the UP_elev_m and stream length to calculate channel slope. 30-meter National Elevation Data was used to gather elevation information. The elevation data is in meters with accuracy ranging from 1 - 15 meters. The DEM has the greatest error associated with low relief, such as in the coastal plain. fp_slope Flood Plain slope. The slope of the flood plain in a representative section of the watershed. National Elevation Data was used to gather elevation information along a line drawn perpendicular to the floodplain. The elevation change and length of floodplain were calculated from a digital hand-drawn line approximating the width of the floodplain. The elevation data is in meters with accuracy ranging from 1 - 15 meters. These slopes are ratios, not multiplied by 100 to calculate percent. They have been reviewed using digital raster graphics of USGS topos, stream coverages, and other related data sources. Without field confirmation, these data represent the most viable approximation of the floodplain slope. Totuparea_mi Total upstream area in square miles. The polygon area from the coverage was extracted and summed in a spreadsheet using the UNIQID and DSID relationship. This field represents the total upstream area including the area of the polygon being queried. Areas were calculated while dataset was projected in Albers NAD83. Original data was in ArcInfo coverage format. Topology was built using the Build command (08/30/2004). The data layer is "topologically clean" as tested with the ArcInfo Build command. Tolerances: Fuzzy = 0.900, Dangle = 0.000. Shapefiles have been compared to the original dataset. Data was converted to shapefile format 07/08/2005. All watersheds within the states of Virgina, Maryland, and Delaware were included. Only a selected set of watersheds from New York, Pennsylvania, West Virginia, Tennessee, and North Carolina were included. Upstream portions of watersheds that begin outside the study area, and flow through the study area were included. Downstream portions of watersheds that exit the study area were excluded. Most State HUC layers have originially been digitized from USGS 1:240000 quadrangles. The resulting accuracy of the linework should be consistent with hand-drawn watersheds on paper maps, that were subsequently digitized on-screen. Lines delineated with the 30-meter NED have been smoothed to remove grid cell edges. Virginia Dept of Conservation and Recreation - DSWC 19951101 Edition: 2 vector digital data The boundaries of the 494 hydrologic units in Virginia at the 14-digit level of detail. This data set covers the whole state and these units are the immediate subsets of the 11 digit level of hydrologic units in Virginia. Contact: Karl Huber, khuber@dcr.state.va.us, (804) 371-7484 This is version 2. Its primary differences with version 1 are the following improvements: (1) better agreement with the USDA NRCS planned and approved watershed projects, (2) incorporation of the July 1992 NRCS document "Guidelines For Mapping and Digitizing Hydrologic Units", particularly (a) the breaking of water features into different units where physical features (dams, confluences, etc.) exist, (b) the effort to make hydrologic unit boundaries continue across state boundaries, and (c) the coding of units upstream beginning and proceeding downstream, (3) the incorporation of local and regional watershed geography, (4) improved listing of water features within a hydrologic unit, beginning with the most significant feature and stepping down from there, and (5) greater linework accuracy to reflect the increased use of this data in a digital file form. 2005 publication date DCR HUCS Watershed boundary in Virginia Maryland Department of Natural Resources 1998 Unknown 1998 vector digital data Annapolis, MD Maryland Department of Natural Resources This file is a statewide digital watershed file. It was created primarily for state and federal agency use. The watersheds define Strahler (Strahler 1952 p. 1120) third order stream drainage by contours on U.S. Geological Survey (USGS) 7.5 minute quadrangle map sheets. Some watersheds drainage areas were defined for streams less than third order and some large area watershed were split to maintain a maximum size of 15,000 acres. The watershed boundaries in this file were developed in a joint state and federal effort to create a consistent watershed file for use by all government agencies with an interest in Maryland's watersheds. The U.S. Natural Resources Conservation Service (NRCS) redefined the third order watersheds creating the HUA14 file. This file contains all of the HUA14 watersheds and some added watersheds to maintain water quality sampling sites. It was also used to create the Maryland Sub-Watershed file. http://www.msgic.state.md.us/techtool ftp://dnrftp.dnr.state.md.us/public/SpatialData/Watershed/WShedBndry/swshed12.htm 2005 publication date MD HUCS Watershed boundary in Maryland U.S. Geological Survey 1999 1 raster digital data Sioux Falls, SD U.S. Geological Survey accessed November 16, 2004 at http://ned.usgs.gov/ http://ned.usgs.gov/ http://ned.usgs.gov/ned/ned.html http://gisdata.usgs.net/ned/ 2005 publication date NED Data were used for delineation of watersheds as the base-map of the watershed segment coverage. USDA, Natural Resources Conservation Service 19981201 1 vector digital data Raleigh, North Carolina USDA, Natural Resources Conservation Service The USDA-Natural Resources Conservation Service, Raleigh Office in cooperation with the NC Center for Geographic Information & Analysis, and the NC Dept. of Environment, Health and Natural Resources, Division of Water Quality developed the Hydrologic Units-North Carolina digital data to track resource and conservation activities in the state's river basins and subbasins. Using the 14-digit hydrologic unit code the regional, sub-regional, accounting, cataloging, NRCS sub-unit, and NRCS reporting unit boundaries id's are recorded. The area attributes allow the user to see hydrologic unit, river basin and sub-basin levels of geography. This file specifically shows the North Carolina subbasins. Contact: Silvia Terziotti USGS, MD, seterzio@usgs.gov, (919) 571-4090 http://www.cgia.state.nc.us/cgdb/index.html http://www.cgia.state.nc.us/cgdb/wsw.html 2005 publication date NC HUCS Watershed boundary in North Carolina USDA-Natural Resources Conservation Service, Tennessee January 10, 2000 Vector Digital Data, Map USDA Natural Resources Conservation Service This coverage contains Hydrologic Unit Areas and their associated coding for Tennessee watersheds. The boundaries of these areas were hand delineated at a scale of 1:24,000 and then digitized on screen over DRG's obtained from the Tennessee Valley Authority. http://www.tn.nrcs.usda.gov/ 2005 publication date TN HUCS Watershed boundary in Tennessee Delaware Department of Natural Resources and Environmental Control (DNREC) 1990 vector digital data The Watersheds were originally digitized from lines that were hand drawn onto 1:24000 USGS topo maps. The digitizing occurred in the early 1990's. Since then, some of the lines have been slightly modified to correct errors where the lines may have crossed streams. The data is currently State Plane NAD 83 meters. It was probably digitized originally inState Plane NAD 27 feet. Sullivan Deborah S. (DNREC), Deborah.Sullivan@state.de.us, 302-739-6308 2005 publication date DE HUCS Watershed boundary in Delaware Chesapeake Bay Program 1999 vector digital data The West Virginia HUCS were selected out of the HUC-11 coverage for the Mid-Atlantic level aggregate of the individual state coverages clipped to the Chesapeake Bay Basin boundaries. ftp://ftp.chesapeakebay.net/pub/Geographic/MidAtlantic/Watersheds/Huc11/ 2005 publication date WV HUCS Watershed boundary in West Virginia Pennsylvania Department of Environmental Resources (PaDER) U.S. Geological Survey, Water Resources Division 07-01-1996 1 vector digital data Open-File-Report 1996-354 USGS http://pa.water.usgs.gov/pa_digit.v2.html 2005 publication date PA HUCS Watershed boundary in Pennsylvania Upper Susquehanna Coalition US Geological Survey US Department of Agriculture Natural Resources Conservation Service 05-01-2002 1 vector digital data Horseheads, New York Upper Susquehanna Coalition This geospatial dataset is a hydrologic unit boundary layer that is at the Subwatershed (11-digit) level for the Upper Susquehanna River Watershed. The dataset was developed from original USGS/NRCS HUC data from both Pennsylvania and New York. The dataset was developed by delineating the boundary lines on 1:24,000 base maps and digitizing the delineated lines. Digital Elevation Model data may have been used in part of the process to establish preliminary boundaries. http://www.u-s-c.org/html/GIS_Data.htm 2005 publication date Upper-Susq sheds Watershed boundary in New York and Pennsylvania Delineated watersheds using 30-meter resolution National Elevation Dataset DEM data, confluences, and streamflow-gaging station locations. Delineated watersheds were used as boundaries when State HUCS were not available. NED September 2001 HUC boundaries from each state in the Chesapeake Bay Drainage were combined into one watershed coverage. The whole states of Virginia, Delaware, and Maryland were included even though some portions do not drain to the Chesapeake Bay. Adjacent state watersheds were included in Tennessee and North Carolina. Watershed size was standardized to coincide with a selected stream network. Watersheds containing streams with at least 100 ft3/sec mean-annual flow were included. If State HUCS included watershed boundaries for sub-basins, these were omitted. Watersheds were split at gaging stations as well. DEM-derived lines were put into the watershed coverage to serve as these breaks. Some lines were re-drawn manually to correct for DEM errors. Arc Edit was used for all these editing processes. General Processing Timeline: DCR HUCS November 2001 to July 2002 MD HUCS January 2002 to July 2002 Upper-Susq sheds January 2002 to Dec 2002 PA HUCS January 2002 to Dec 2002 WV HUCS January 2002 to Dec 2002 NC HUCS July 2002 to July 2003 DE HUCS July 2002 to July 2003 TN HUCS January 2003 to Dec 2003 DCR Hucs MD HUCS Upper-Susq sheds WV HUCS NC HUCS DE HUCS PA HUCS November 2001 - December 2005 Attributed dataset with calculated and text fields. Table editing was done within ArcInfo as well as ArcMap (prior to 9.0). Calculated fields were created in spreadhseets outside of ArcInfo based on watershed UNIQID. For example, the flood plain slope calculation was calculated for each model watershed based on UNIQID, the slope calculated in a separate table. The flood plain slope table was joined to the watershed table, and the attributes were calculated into a new field. 2003 - 2005 Dataset projected to UTM zone 18 NAD83. The original dataset was created in Albers NAD83, and was projected after all the state watersheds were combined into one coverage. 2003 Vector Complete chain 3476 Label point 1062 GT-polygon composed of chains 1062 Point 4 Universal Transverse Mercator 18 0.999600 -75.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000420 0.000420 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 cbshedutm.pat Polygon Attribute Table ESRI FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. AREA Polygon Area ESRI 0 undetermined maximum square meters PERIMETER length of outer boundary ESRI 0 undetermined maximum meters CBSHEDUTM# Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. CBSHEDUTM-ID User-defined feature number. ESRI MAJOR Major Basin Code Data set developer P Potomac River Data set developer S Susquehanna River Data set developer J James River Data set developer Y York River Data set developer R Rappahnnock River Data set developer X Patuxent River Data set developer W Upper West Shore, Cove Point to Susquehanna Data set developer E Eastern Shore Data set developer Y Youghiogheny River, Maryland west of the CB watershed Data set developer D Delaware Bay and coastal Data set developer T Upper Tennessee River (Clinch-Powell-Holston) Data set developer B Big Sandy River Data set developer N New River Data set developer O Roanoke-Dan River Data set developer M Nottoway-Meherin (and coastal plain) Data set developer K Upper Yadkin Basin, (North Carolina drainage) Data set developer MINOR Minor Basin code (sub basins) Data set developer U Upper Data set developer L Lower Data set developer B Below the Fall Line (east) Data set developer W West Branch Susquehanna Data set developer J Juniata River Data set developer S Shenandoah River, Potomac Basin Data set developer A Appomattox, or Rappahannock, or Patuxent Data set developer P Pamunkey River Data set developer M Mattaponi River, or Cove Point to Susquehanna Data set developer O Youghiogheny (Maryland west of the CB watershed) Data set developer E Delaware Bay and coastal Data set developer S Big Sandy River Data set developer R New River, or Roanoke River Data set developer D Roanoke-Dan River N Nottoway-Meherin (and coastal plain) UNIQID Unique ID number of Watershed Data set developer Unique Number assigned to each watershed automatically assigned, with some manually assigned, but reviewed DSID UNIQID of Downstream Watershed data set developer any one UNIQID the value of the downstream watershed that this watershed flows into data set developer 0 No modeled river reach (no F-Table), most of these are estuarine watersheds. some are areas that drain out of the study area. data set developer 1 Modeled reach drains directly to Estuary, no other watershed data set developer manually assigned, but reviewed FLOW Calculater term representing relative size of the river: Round (log10 (mean Monthly Q) * 3 - 5) data set developer 0 9 relative units, Log scale LAKE Reservoir category (Binary) Data set developer 0 No reservoir modeled data set developer 1 Entire watershed modeled as reservoir data set developer PROV Physiographic Province code U.S. Geological Survey CP Coastal Plain U.S. Geological Survey VR Valley and Ridge U.S. Geological Survey PD Piedmont U.S. Geological Survey AP Appalachian Plateau U.S. Geological Survey BR Blue Ridge U.S. Geological Survey small scale map used, and some manual assignment STRM_LENG_M Length of Stream Reach (meters) for modeled river reaches. Watersheds without modeled reaches have zero values for stream length. dataset developer 0 Undetermined maximum meters TOT_UPAREA_M Total contributing drainage area to bottom of reach (square meters) Data set developer 0 Undetermined maximum square meters TOTUPAREA_MI Total contributing drainage area to bottom of reach (square miles) Data set developer 0 Undetermined maximum square miles UP_ELEV_M Up stream elevation of channel (meters) Data set developer 0 Undetermined maximum meters DN_ELEV_M Down stream elevation of channel (meters) Data set developer 0 Undetermined maximum meters FP_SLOPE Floodplain slope (unitless) Data set developer greater than zero Undetermined maximum ratio CATCODE2 Concatenation of Major Minor FLOW UNIQID DSID Data set developer Concatenation of Major Minor FLOW UNIQID DSID fields DAM_NAME Name of the dam or reservior if present Data set developer Dam_name various sources based upon state MAJMIN Major_Minor Concatanation Data set developer SU Susquehanna Upper, above confluence with West Branch Data set developer SW West Branch Susquehanna Data set developer SJ Juniata River Data set developer SL Susquehanna, below confluence with West Branch Data set developer PU Potomac Upper, above confluence with Shenandoah Data set developer PS Shenandoah River Data set developer PL Monocacy and Potomac, below Shenandoah to fall line Data set developer PB Potomac, below fall line Data set developer JU James Upper, to Blue Ridge Mtns, near or below Glasgow, VA Data set developer JL James Lower, below Glasgow to fall line Data set developer JA Appomattox Data set developer JB James River, below fall line Data set developer YP Pamunkey River Data set developer YM Mattaponi River Data set developer YB York, below fall line Data set developer RA Rappahannock River Data set developer RB Rappahannock, below fall line Data set developer XA Patuxent River, above fall line Data set developer XB Patuxent River, below fall line Data set developer WM Cove Point to Susquehanna Data set developer EU Upper Eastern Shore, Susquehanna to Choptank Data set developer EL Lower Eastern Shore, below Choptank Data set developer YO Youghiogheny (Maryland west of the CB watershed) Data set developer DE Delaware Bay and coastal Data set developer KU NC basin Upper Yadkin basin Data set developer TU Upper Tennessee (Clinch-Powell-Holston) Data set developer BS Big Sandy Data set developer NR New River Data set developer OD Roanoke-Dan River Data set developer OR Roanoke River Data set developer MN Nottoway-Meherin (and coastal plain) Data set developer U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. ARCE Polygon coverage zipped, Arc Interchange file named cb_shed_e00.zip 8792 KB http://water.usgs.gov/GIS/dsdl/sir2005-5073_shed_e00.zip shapefile zipped Shapefile named cb_shed_shape.zip 13987 http://water.usgs.gov/GIS/dsdl/sir2005-5073_shed_shape.zip SDTS Zipped SDTS format named cb_shed_SDTS.zip 4492 KB http://water.usgs.gov/GIS/dsdl/sir2005-5073_shed_sdts.zip None. This dataset is provided by USGS as a public service. 20041122 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998