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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. |
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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. |
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Virginia Department of Environmental Quality, Office of Ecology, Water Monitoring & Assessment Program |
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5000 |
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<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> |
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<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> |
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va_aus_reservoir_2020_final_wm |
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["Reservoirs","2020","Water Quality Assessment","Lakes","Integrated Report"] |
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en-US |
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150000000 |
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