0.001
Shapefile
Esri ArcGIS 10.4.0.5524
P6_LandSegs_041415
1
-81.642600
-74.145543
44.097086
36.405481
dataset
EPSG
6.13(3.0.1)
0
P6_LandSegs_041415
Feature Class
0
Shape
Feature geometry.
Esri
Coordinates defining the features.
Shape
Geometry
0
0
0
OBJECTID
OBJECTID
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
BasinGroup
BasinGroup
String
50
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.
20160505
ISO 19115 Topic Category
boundaries
EPA GIS Keyword Thesaurus
Modeling
None
Chesapeake Bay Watershed
Delaware
Maryland
New York
Pennsylvania
Virginia
Washington DC
West Virginia
User
US Environmental Protection Agency
P6_RiverSegs_042616
Chesapeake Bay Program (CBP)
Annapolis, MD
20160506
-80.542601
-74.580735
42.987042
36.666691
None
None. Please check sources, scale, accuracy, currency and other available information. Please confirm that you are using the most recent copy of both data and metadata. Acknowledgement of the EPA would be appreciated.
Publication date
20160426
asNeeded
This Chesapeake Bay Program Watershed Model Phase 6 River Segment data set is an ArcGIS shapefile depicting river segments in the Chesapeake Bay Watershed and adjacent areas in Maryland and Delaware. The River Segments for the Chesapeake Bay watershed part of the
model domain are largely based on the USGS Chesapeake Bay SPARROW model river reach segmentation (Preston and Brakebill 1999). A decision rule established during the Phase 5.3 Model development was to simulate river reaches with discharges of 100 cubic feet per second (cfs) or greater. The areas of drainage to those simulated river reaches were the river-segments. Exceptions were made to the 100-cfs cutoff rule for some river reaches that had useful monitoring data but were less than 100 cfs, which were included as river-segments in some cases. For the portions of the Phase 5.3 model domain outside the Chesapeake watershed the SPARROW Model was unavailable and so a 1:500,000-scale river reach network was used. Thirty-meter-resolution Digital Elevation Model (DEM) data derived from digitized USGS maps were used to delineate watersheds for each river-segment. State watershed boundaries replaced the DEM-derived watersheds where both data were coincident. There were a few changes made in the Phase 6 River Segments.
1. The boundary lines of those River Segments that made up the Chesapeake Bay basin boundary were replaced with the basin boundary derived from the USGS WBD boundaries.
2. The only portions of the model domain outside of the Chesapeake Bay basn that were retained were those in Maryland and Delaware.
3. At the request of MDE and ICPRB, eight River Segments that contained reservoirs were subdivided to delineate the areas draining into those reservoirs.
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, 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 (including the Chesapeake Bay Watershed, as well parts of counties outside the watershed that are partly within the watershed) into land segments, a stream-reach network, and associated watersheds.
The Land Segments are intersected with the River Segments to create the Land-River segments that are the geographic entities used by the Chesapeake Bay Regional Watershed Model.
http://project-open-data.github.io/schema/#accessLevel
public
Standard Technical Controls
U.S. Environmental Protection Agency, Region 3-Chesapeake Bay Program
Howard Weinberg
GIS Analyst
mailing and physical address
410 Severn Avenue, Suite 112
Annapolis
MD
21403
410-267-5735
410-267-5777
hweinber@chesapeakebay.net
http://www.chesapeakebay.net/
Data were collected using methods that have unknown accuracy (EPA National Geospatial Data Policy [NGDP] Accuracy Tier 10). For more information, please see EPA's NGDP at http://epa.gov/geospatial/policies.html)
Tests for integrity have not been performed.
Features represented have not been tested for completeness
Downloadable Data
Although these data have been processed successfully on a computer system at the Environmental Protection Agency, no warranty expressed or implied is made regarding the accuracy 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. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data to evaluate data set limitations, restrictions or intended use. The U.S. Environmental Protection Agency shall not be held liable for improper or incorrect use of the data described and/or contained herein.
U.S. Environmental Protection Agency, Region 3-Chesapeake Bay Program
Howard Weinberg
GIS Analyst
mailing and physical address
410 Severn Avenue, Suite 112
Annapolis
MD
21403
410-267-5735
410-267-5777
hweinber@chesapeakebay.net
http://www.chesapeakebay.net/
20160615
20200615
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
U.S. Environmental Protection Agency, Region 3-Chesapeake Bay Program
Howard Weinberg
GIS Analyst
mailing and physical address
410 Severn Avenue, Suite 112
Annapolis
MD
21403
410-267-5735
410-267-5777
hweinber@chesapeakebay.net
http://www.chesapeakebay.net/
coordinate pair
meters
North American Datum of 1983
Geodetic Reference System 1980
6378137.000000
298.257222
major_basin_new
002
Projected
GCS_WGS_1984
Linear Unit: Meter (1.000000)
WGS_1984_Web_Mercator_Auxiliary_Sphere
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20211018
13121700
1.0
Item Description
FALSE
20210111
16305300
20210111
16305300
Simple
FALSE
0
TRUE
FALSE