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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 2015 through Dec. 31 2020 was used to characterize each applicable Assessment Unit (AU) within the Commonwealth. |
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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 2015 through Dec. 31 2020 was used to characterize each applicable Assessment Unit (AU) within the Commonwealth. |
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Virginia Department of Environmental Quality, Office of Ecology, Water Monitoring and Assessment Program |
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5000 |
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[] |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Display and define all surface waters of the commonwealth identified within the 2022 305(b)/303(d) Water Quality Assessment Integrated Report. 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></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>There are no access limitations. Line work and attributes should not be altered except by the developer (DEQ). Crediting the Virginia Department of Environmental Quality as data source is requested. This data may be shared with others.</SPAN></P></DIV></DIV></DIV> |
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va_aus_riverine |
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["rivers","streams","305(b)","303(d)","assessed waters","impaired waters","assessment units","water quality assessment"] |
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en-US |
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625000 |
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