20230504
19144300
1.0
FALSE
CBW_NHDv21_catchment_albers_30m_2022
002
1350615.000000
1785075.000000
1687605.000000
2405235.000000
1
Projected
GCS_North_American_1983
Linear Unit: Meter (1.000000)
USA_Contiguous_Albers_Equal_Area_Conic_USGS_version
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20230504
18084200
20230504
18535600
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-nhdplusv2-1-100k-catchments-for-the-chesapeake-bay-watershed/about
https://data-chesbay.opendata.arcgis.com/datasets/modified-nhdplusv2-1-100k-catchments-for-the-chesapeake-bay-watershed/about
File Geodatabase Feature Class
Modified NHDPlusV2.1 (100k) Catchments for the Chesapeake Bay Watershed
2023
Sarah M. McDonald
Gopal Bhatt
Peter R. Claggett
vector digital data
McDonald, Sarah M., Bhatt, Gopal, and Claggett, Peter R., 2023, Modified NHDPlusV2.1(100k) Catchments in the Chesapeake Bay Watershed, https://data-chesbay.opendata.arcgis.com/datasets/modified-nhdplusv2-1-100k-catchments-for-the-chesapeake-bay-watershed/about
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>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 The areas of land captured in the catchments representing the watershed are outdated due to man-made storm drains and pumping practices.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. This layer ensures consistent representation of the watershed. The modified Chesapeake Bay Watershed boundary is equivalent to the boundary of the modified catchments. </SPAN></P></DIV></DIV></DIV>
The modified 1:100k Catchments for the Chesapeake Bay Watershed layer is an updated National Hydrography Dataset Plus (NHDPlus) v2.1 catchment layer which incorporates storm drain information in Chesapeake City, Virginia to better reflect flow to the Chesapeake Bay and contains only catchments that contain some flow to the Chesapeake Bay. The authoritative layer contains 83,628 catchments, covering a 170,470.97 square kilometer area.
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
-80.562890
-73.861751
43.557640
36.515696
The FEATUREID attribute is consistent with that of the native NHD dataset and can be used with native NHDPlus routing and streamline products. The GRIDCODE values differ due to the difference in processing extent and are arbitrary unique values assigned to each record in the datasets. The AreaSqKM fields differ for some catchments in Chesapeake City, VA to reflect the new area of the altered catchments and are equivalent otherwise.
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
83628
The vector catchment data us a shapefile that includes 4 attributes:
1. GRIDCODE - arbitrary unique value per catchment.
2. FEATUREID - unique catchment ID, equivalent to native NHDPlusv2.1 products, including catchments and flowlines.
3. AreaSqKM - area of polygon in units of Square Kilometers.
4. Geometry - field containing the polygon geometries.
The raster catchment layer is a 30-meter resolution GeoTIFF where the pixel value is equivalent to the FEATUREID.
The vector Chesapeake Bay Watershed Boundary is a shapefile representing the boundary of the watershed and is equivalent to the dissolved vector catchment layer that is edited to include the Chesapeake Bay.
McDonald, Sarah M., Bhatt, Gopal, and Claggett, Peter R., 2023, Modified NHDPlusV2.1(100k) Catchments in the Chesapeake Bay Watershed, https://data-chesbay.opendata.arcgis.com/datasets/modified-nhdplusv2-1-100k-catchments-for-the-chesapeake-bay-watershed/about
CBW_NHDv21_catchment_albers_30m_2022
Feature Class
83628
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.
GRIDCODE
GRIDCODE
Double
8
0
0
FEATUREID
FEATUREID
Double
8
0
0
AreaSqKM
AreaSqKM
Double
8
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
Esri
8.1.2
Simple
FALSE
83628
TRUE
FALSE