20221007
14351300
1.0
FALSE
DissolveBoundaries CBW_closedBoun_Pairwis_Merge G:\ImageryServer\NHDPlus_v21_latest\Official_CBPO_versions\Official_Proposed_20220921\CBW_2020_closed.shp SINGLE_PART # # #
Rename G:\ImageryServer\NHDPlus_v21_latest\Official_CBPO_versions\Official_Proposed_20220921\CBW_2020_closed.shp G:\ImageryServer\NHDPlus_v21_latest\Official_CBPO_versions\Official_Proposed_20220921\CBW_boundary_2022_closed.shp ShapeFile
Merge CBW_boundary_2022_closed;CBW_Boundary_albers_2022 C:\Users\smcdonald\Documents\Data\ChangePaper\Analysis\data\output\comparison\ChangePaper\ChangePaper.gdb\CBW_boundary_2022_clos_Merge "COUNT "COUNT" true true false 20 Double 0 0,First,#,CBW_boundary_2022_closed,COUNT,-1,-1" NO_SOURCE_INFO
Dissolve CBW_boundary_2022_clos_Merge C:\Users\smcdonald\Documents\Data\NHD\Official\v3\CBW_boundary_2022_closed.shp # # SINGLE_PART DISSOLVE_LINES #
UpdateSchema "CIMDATA=<CIMStandardDataConnection xsi:type='typens:CIMStandardDataConnection' 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/3.0.0'><WorkspaceConnectionString>DATABASE=C:\Users\smcdonald\Documents\Data\NHD\Official\v3</WorkspaceConnectionString><WorkspaceFactory>Shapefile</WorkspaceFactory><Dataset>CBW_boundary_2022_closed</Dataset><DatasetType>esriDTFeatureClass</DatasetType></CIMStandardDataConnection>" <operationSequence><workflow><AddField><field_name>SqKM</field_name><field_type>FLOAT</field_type><field_is_nullable>False</field_is_nullable><field_is_required>False</field_is_required></AddField></workflow></operationSequence>
CalculateGeometryAttributes CBW_boundary_2022_closed "SqKM AREA_GEODESIC" # "Square Kilometers" 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]] "Same as input"
ExportFeatures CBW_boundary_2022_closed X:\Boundaries\Boundaries.gdb\CBW_boundary_2022_closed # NOT_USE_ALIAS "Id "Id" true true false 6 Long 0 6,First,#,CBW_boundary_2022_closed,Id,-1,-1;SqKM "SqKM" true true false 13 Float 0 0,First,#,CBW_boundary_2022_closed,SqKM,-1,-1" #
CBW_boundary_2022_closed
file://\\gisage1p-solo\agspublish\Boundaries\Boundaries.gdb
Local Area Network
0.000
002
-8965801.549700
-8302290.303600
4391483.506500
5310045.214300
1
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/3.1.0'><WKT>PROJCS["WGS_1984_Web_Mercator_Auxiliary_Sphere",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Mercator_Auxiliary_Sphere"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",0.0],PARAMETER["Standard_Parallel_1",0.0],PARAMETER["Auxiliary_Sphere_Type",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",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
20230504
17573300
20230504
18425100
150000000
5000
FGDC
Sarah M McDonald
U.S. Geological Survey, SOUTHEAST REGION
Geographer
410-267-5739
Forest Dr. Suite 130
Annapolis
MD
21401
US
smcdonald@usgs.gov
20230504
ArcGIS Metadata
1.0
Zhaoying Wei
University of Maryland Center for Environmental Science
(410) 267-5735
Forest Dr. Suite 130
Annapolis
MD
21401
US
zwei@chesapeakebay.net
None
Digital Data
https://data-chesbay.opendata.arcgis.com/datasets/modified-chesapeake-bay-watershed-boundary/about
https://data-chesbay.opendata.arcgis.com/datasets/modified-chesapeake-bay-watershed-boundary/about
File Geodatabase Feature Class
CBW_boundary_2022_closed
2023
Sarah M. McDonald
Gopal Bhatt
Peter R. Claggett
vector digital data
McDonald, Sarah M., Bhatt, Gopal, and Claggett, Peter R., 2023, Modified Chesapeake Bay Watershed Boundary, https://data-chesbay.opendata.arcgis.com/datasets/modified-chesapeake-bay-watershed-boundary/about
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The watershed boundary has been modified to represent a consistent view of the Chesapeake Bay Watershed with the modified NHDv2.1 Catchments. The catchment and catchment routing data in NHDv2.1 products are utilized to understand flow to the Chesapeake Bay and to assess water quality impacts to the Bay. The areas of land captured in the catchments representing the watershed are outdated due to man-made storm drains and pumping practices. Additionally, the catchments used to represent the Chesapeake Bay Watershed vary depending on how the catchments were selected.</SPAN></P></DIV></DIV></DIV>
The modified Chesapeake Bay Watershed boundary represents all land and water within the watershed. The boundary is that of the Modified NHDPlusV2.1 (100k) Catchments.
Chesapeake Bay Program.
City of Chesapeake Public Works Department – Engineering Division [Crystal Bloom, Deva K. Borah, Benjamin Umphlett].
The Pennsylvania State University [Gopal Bhatt].
U.S. Geological Survey (USGS) - Lower Mississippi Gulf Water Science Center [Peter R. Claggett, Sarah M. McDonald, Renee L. Thompson].
U.S. Geological Survey (USGS) - Virginia and West Virginia Water Science Center [Gary Shenk].
Sarah M McDonald
U.S. Geological Survey, SOUTHEAST REGION
Geographer
410-267-5739
Forest Dr. Suite 130
Annapolis
MD
21401
US
smcdonald@usgs.gov
Common geographic areas
Chesapeake
Mid Atlantic
ISO 19115 Topic Category
boundaries
Alexandria Digital Library Feature Type Thesaurus
drainage basins
boundaries
drainage basins
Chesapeake
Mid Atlantic
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The organizations responsible for generating and funding this dataset make no representations of any kind including, but not limited to the warranties of merchantability or fitness for a particular use, nor are any such warranties to be implied with respect to the data. The data is provided on the condition that neither the USGS nor the U.S. Government, or any of the collaborating organizations shall be held liable for any damages resulting from the authorized or unauthorized use of the data. Although every effort has been made to ensure the accuracy of information, errors may be reflected in data supplied. Possible errors or limitations of the data have been documented but the list is not exhaustive. The user 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. Credit should always be given to the data source when this data is transferred, altered, or used for analysis.</SPAN></P></DIV></DIV></DIV>
Although these data have been processed successfully on a computer system at the Chesapeake Bay Program, no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The Chesapeake Bay Program shall not be held liable for improper or incorrect use of the data described and/or contained herein.
None. Please see 'Distribution Info' for details.
Data were produced in ESRI's ArcGIS Pro 3.0.0.
true
-80.5629
-73.8618
42.7643
37.2402
publication date
2023
1
-80.541166
-74.580743
42.987341
36.657571
The SqKM field represents the total Chesapeake Bay Watershed area, in square kilometers and was calculated via ArcGIS Pro's Calculate Geometry function.
The data were processed at 30-meter resolution to be consistent with the native NHDv2.1 data. The drainage information from Chesapeake City, VA were rasterized to 30-meters, snapped to the native NHDv2.1 raster, and re-vectorized to ensure the altered catchments reflected the same resolution as the native data.
Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the entire metadata record carefully for additional details.
No formal positional accuracy tests were conducted
No formal positional accuracy tests were conducted
Identify catchments within the Chesapeake Bay Watershed.
All catchments in the NHD routing information having a diversion fraction (DIVFRAC) greater than 0 within or draining to a catchment in the watershed were included in the final layer. The routing data includes an attribute called RPU (Raster Processing Unit), which denotes the watershed. The initial “routing detected” catchments were the catchments with an RPU value of 02a, the code for the Chesapeake Bay Watershed. There is one case of a catchment with a 0% diversion fraction value that is included due to information from the Permit Administrator for Public Works Stormwater Management Regulatory for Virginia Beach.
2022
NHDPlusv2.1
Alter catchments in Chesapeake City, VA to reflect stormwater drainage provided by the city's Public Works Department.
Chesapeake City’s Public Works Department provided 4 Storm Water Management Model (SWMM) results for 4 sub-watersheds: New Mill Creek 1 & 2, Bells Mill Creek, Oak Grove, and Indian River. SWMM data for Bells Mill Creek was provided and incorporated into the authoritative layer by editing the existing catchments based on the drainage lines provided by the city, including catchments 10054282, 10054638, 10055062, and 10055252. Additionally, New Mill Creek 1 & 2 was incorporated by editing catchment 10054140. The portions of Oak Grove and Indian River not already within the catchments were small and not edited into the authoritative layer.
The vector modelling units for each sub-watershed were assigned the FEATUREID of the catchment they drain to. These polygons were rasterized on the assigned FEATUREID at 30-meter resolution and snapped to the native 30-meter resolution NHDv2.1 catchment raster. The results were mosaicked to new raster with the 30-meter raster version of the catchments to ensure no gaps or slivers in the final dataset. The mosaicked raster is the 30-meter GeoTIFF version of the catchment layer. The mosaicked raster was vectorized (with multi-part polygons) to produce the final vector dataset.
2022
SWMM
NHDPlusv2.1
Create updated Chesapeake Bay Watershed Boundary.
The vector catchments geometries were dissolved into a multi-part polygon. The results were edited by "closing" the boundary to include the Chesapeake Bay in the boundary, as the catchments in this dataset do not cover the Bay. This edit is a line feature that was manually drawn between the points nearest the bay boundary (Fisherman Island, VA and North Virginia Beach, VA).
2022
This dataset serves as the base dataset to be updated.
100000
National Hydrography Dataset Plus Catchments
NHDPlusv2.1
2012-06-11
2.1
U.S. Environmental Protection Agency
U.S. Geological Survey
vector digital data
https://www.epa.gov/waterdata/get-nhdplus-national-hydrography-dataset-plus-data
publication date
2016
This dataset is utilized to adjust catchment boundaries to better reflect drainage to the Chesapeake Bay.
Storm Water Management Model, City of Chesapeake, VA
SWMM
2022-09-16
City of Chesapeake, Virginia
vector digital data
Data was provided by the City of Chesapeake Public Works Department - Engineering Division.
https://www.epa.gov/water-research/storm-water-management-model-swmm
https://www.cityofchesapeake.net/1117/Bells-Mill
publication date
2010-01-29
1
The vector Chesapeake Bay Watershed Boundary contains one attribute, SqKM. This attribute is the total area included in the boundary, measured in units of square kilometers.
McDonald, Sarah M., Bhatt, Gopal, and Claggett, Peter R., 2023, Modified Chesapeake Bay Watershed Boundary, https://data-chesbay.opendata.arcgis.com/datasets/modified-chesapeake-bay-watershed-boundary/about
CBW_boundary_2022_closed
Feature Class
1
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.
Id
Id
Integer
4
0
0
SqKM
SqKM
Single
4
0
0
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.
Esri
Positive real numbers that are automatically generated.
dataset
EPSG
6.18.3(9.3.1.2)
Simple
FALSE
1
TRUE
FALSE
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