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va_aus_reservoir_2020_final_wm
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https://apps.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/171
https://apps.deq.virginia.gov/mapper_ext/GIS_Datasets/WQA_2020_Final.zip
File Geodatabase Feature Class
Reservoirs (2020 Final WQA IR Assessment)
va_aus_reservoir_2020_final_wm
2020-12-18T00:00:00
2020 Final 305(b)/303(d) Assessment Unit GIS dataset. Biennially, DEQ must produce a Water Quality Assessment Integrated Report (IR) on the surface waters within the state’s jurisdiction as mandated by the Clean Water Act (CWA) sections 303(d), 305(b), and 314 and the state’s Water Quality Monitoring, Information, and Restoration Act (WQMIRA). This geographic layer is a component of the process to produce the statistics and maps shown in the IR. Data from DEQ and non-DEQ contributors collected from Jan. 1 2013 through Dec. 31 2018 was used to characterize each applicable Assessment Unit (AU) within the Commonwealth. Virginia reports on three basic water types for the IR; rivers and streams, lakes and reservoirs, and estuaries.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN STYLE="font-weight:bold;"><SPAN>Display and define all surface waters identified within the 2020 305(b)/303(d) Water Quality Assessment Integrated Report. </SPAN></SPAN><SPAN><SPAN>The Assessment Unit (AU) dataset was created from United States Geological Survey (USGS) National Hydrography Dataset (NHD) high-resolution 1:24,000 data extracted in September 2012. The NHD product was used by DEQ regional assessment staff to assign previously established assessment unit IDs based on predetermined up- and downstream extents and applicable Water Quality Standards. Some erroneous waters were removed and a few waters were corrected for spatial accuracy using Virginia Base Mapping Program aerial photography from Virginia Geographic Information Network (VGIN), and recent NHD data where available.</SPAN></SPAN></P><P /><P><SPAN><SPAN>There are 3 feature classes within the geodatabase:</SPAN></SPAN></P><P><SPAN><SPAN>va_aus_estuarine – estuarine waters within the commonwealth, including the Chesapeake Bay and tidal tributaries to the Bay</SPAN></SPAN></P><P><SPAN><SPAN>va_aus_reservoir – lakes and reservoirs with Water Quality Standards or those monitored within the commonwealth; see appendix 7 of the IR for a complete list</SPAN></SPAN></P><P><SPAN><SPAN>va_aus_riverine – free flowing surface waters within the commonwealth </SPAN></SPAN></P><P /><P><SPAN><SPAN>This data constitutes the United States Environmental Protection Agency (EPA) approved version of the assessment unit hydrology for Virginia. Attributes assigned to each water segment are based on details associated with the ID305B (assessment unit ID) from the statewide water quality assessment database (ADB) (ADB is deprecated as of the 2020 cycle). Data validations are performed on the data prior to linking attributes to the GIS data, however errors may still occur.</SPAN></SPAN></P><P /><P><SPAN><SPAN>Additionally, a summary dataset of water quality monitoring stations (va_20ir_wqms) which includes DEQ and non-DEQ data is generated to supplement this AU data.</SPAN></SPAN></P><P /><P><SPAN><SPAN>Please direct any questions about attribute accuracy to the Data Contact.</SPAN></SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><SPAN>This geographic information system (GIS) data is made available as a public service.</SPAN></SPAN><SPAN STYLE="font-weight:bold;"><SPAN>This dataset is to be used for reference purposes only and Virginia Department of Environmental Quality, is not responsible for any inaccuracies herein contained</SPAN></SPAN><SPAN><SPAN>. No responsibility is assumed for damages or other liabilities due to the accuracy, availability, use or misuse of the information herein provided. GIS information is in the public domain and may be copied without permission; citation of the source is suggested.</SPAN></SPAN></P><P><SPAN><SPAN>The information contained within this geospatial dataset is for reference purposes only and is </SPAN></SPAN><SPAN STYLE="font-weight:bold;"><SPAN>not</SPAN></SPAN><SPAN><SPAN>to be construed or used as a "legal description” or for legal purposes. This information is believed to be accurate, but accuracy is not guaranteed. Information drawn from this dataset must be used in consultation with appropriate federal, state, or local resource management officials</SPAN></SPAN><SPAN><SPAN>. </SPAN></SPAN><SPAN><SPAN>Any errors or omissions should be reported to Virginia Department of Environmental Quality</SPAN></SPAN></P><P><SPAN STYLE="font-weight:bold;font-size:12pt"><SPAN>Line work and attributes should not be altered except by the developer (DEQ).</SPAN></SPAN><SPAN STYLE="font-size:12pt"><SPAN>Crediting the Virginia Department of Environmental Quality as data source is requested. This data may be shared with others.</SPAN></SPAN></P></DIV></DIV></DIV>
Virginia Department of Environmental Quality, Office of Ecology, Water Monitoring & Assessment Program
WQA
Water Quality Assessment
Integrated report
2020
Reservoirs
Lakes
Cleo L. Baker
Virginia Department of Environmental Quality
1111 East Main Street
Richmond
Virginia
23219
cleo.baker@deq.virginia.gov
804-698-4191
Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.0.12790
1
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-76.101165
39.173235
36.541063
Reservoirs
2020
Water Quality Assessment
Lakes
Integrated Report
va_aus_reservoir_2020_final_wm
Feature Class
258
OBJECTID
OBJECTID
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
ID305B
Assessment Unit ID
String
50
0
0
ACRES
Acres
Double
8
0
0
CYCLE
Cycle
String
4
0
0
WATER_NAME
Water Name
String
100
0
0
LOCATION
Location
String
255
0
0
CATEGORY
Category
String
10
0
0
AU_COMMENTS
AU Comments
String
1073741822
0
0
IMP_CAUSE
Impairment Cause(s)
String
1073741822
0
0
SOURCE
Source(s)
String
1073741822
0
0
AQUA_LIFE
Aquatic Life
String
35
0
0
DEEP_CHANN
Deep Channel
String
35
0
0
DEEP_WATER
Deep Water
String
35
0
0
FISH_CONSU
Fish Consumption
String
35
0
0
MIGRATORY
Migratory
String
35
0
0
OPEN_WATER
Open Water
String
35
0
0
PWS
Public Water Supply
String
35
0
0
RECREATION
Recreation
String
35
0
0
SHELLFISH
Shellfishing
String
35
0
0
SW_SAV
Shallow Water SAV
String
35
0
0
WILDLIFE
Wildlife
String
35
0
0
SHAPE
SHAPE
Geometry
0
0
0
Feature geometry.
Esri
Coordinates defining the features.
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.
definition
definition
String
700
0
0
CatOrigin
CategoryOrigin
String
50
0
0
Assessment
Assessment
String
50
0
0
AssessDef
AssessmentDefinition
String
100
0
0
Field Name Field Alias Field Summary
OBJECTID Auto-generated number assigned to each feature
Shape Feature geometry type
ID305B Assessment Unit ID Unique alpha-numeric assessment unit identification code
Miles / Acres / Sq_miles Miles / Acres / Sq_miles Water size for the specific feature class type calculated in map units; rivers = Miles; reservoirs = Acres; estuaries = Sq_miles
CYCLE Cycle Current assessment reporting cycle; 2020
WATER_NAME Water Name Name of the water body
LOCATION Location Description of the location extent of the segment of water
CATEGORY Category Virginia or EPA assessment category representing the overall characterization of the water as defined in 2020 Assessment Guidance ranging from category 1 through 5R
AU_COMMENTS AU Comments Assessment Unit comments IMP_CAUSE Impairment Cause(s) Cause(s) of impairment to the water body
SOURCE Source(s) Suspected or confirmed sources attributed to the impairment cause(s)
AQUA_LIFE Aquatic Life Assessment status of the Aquatic Life Designated Use
DEEP_CHANN Deep Channel Assessment status of the Deep Channel (Aquatic Life) Designated Sub-Use, where applicable
DEEP_WATER Deep Water Assessment status of the Deep Water (Aquatic Life) Designated Sub-Use, where applicable
FISH_CONSU Fish Consumption Assessment status of the Fish Consumption Designated Use
MIGRATORY Migratory Assessment status of the Migratory Fish Spawning and Nursery (Aquatic Life) Designated Sub-Use, where applicable
OPEN_WATER Open Water Assessment status of the Open Water (Aquatic Life) Designated Sub-Use, where applicable
PWS Public Water Supply Assessment status of the Public Water Supply Designated Use, where applicable
RECREATION Recreation Assessment status of the Recreation Designated Use
SHELLFISH Shellfishing Assessment status of the Shellfishing Designated Use, where applicable
SW_SAV Shallow Water SAV Assessment status of the Shallow Water Submerged Aquatic Vegetation (Aquatic Life) Designated Sub-Use, where applicable
WILDLIFE Wildlife Assessment status of the Wildlife Designated Use
Shape_Length Auto-generated length of the feature in internal units
Shape_Area Auto-generated area of the feature in internal units, except for the riverine feature class where this attribute is not applicable
2020 Final Assessment Units, Virginia Department of Environmental Quality Geospatial Data Fact Sheet
dataset
EPSG
8.8(9.3.1.2)
258
Simple
FALSE
258
TRUE
FALSE
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