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Display and define all surface waters identified within the 2020 305(b)/303(d) Water Quality Assessment Integrated Report. <\/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>

There are 3 feature classes within the geodatabase:<\/SPAN><\/SPAN><\/P>

va_aus_estuarine \u2013 estuarine waters within the commonwealth, including the Chesapeake Bay and tidal tributaries to the Bay<\/SPAN><\/SPAN><\/P>

va_aus_reservoir \u2013 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>

va_aus_riverine \u2013 free flowing surface waters within the commonwealth <\/SPAN><\/SPAN><\/P>

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>

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>

Please direct any questions about attribute accuracy to the Data Contact.<\/SPAN><\/SPAN><\/P>

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