Estuaries (2024 Final WQA IR Assessment)

Show all riverine waters (polylines) identified in the 2024 Virginia 305(b)/303(d) Water Quality Assessment Integrated Report. Click Here to view Data Fact Sheet. Provide assessment summary details for all estuarine and ocean waters identified within the 2024 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 updated using Virginia Base Mapping Program aerial photography from Virginia Geographic Information Network (VGIN), and recent NHD data where available.展示2024年弗吉尼亚州《305(b)/303(d)水质评估综合报告》中识别的全部河流水域要素（折线（polylines））。点击此处查看数据概况表（Data Fact Sheet）。提供2024年《305(b)/303(d)水质评估综合报告》收录的所有河口与海洋水域的评估汇总详情。评估单元（Assessment Unit, AU）数据集基于2012年9月提取的美国地质调查局（United States Geological Survey, USGS）国家水文数据集（National Hydrography Dataset, NHD）1:24000高分辨率数据构建而成。弗吉尼亚州环境质量部（DEQ）区域评估人员依托该国家水文数据集产品，依据预先划定的上下游范围与适用水质标准，为数据集分配预先确定的评估单元编号。部分存在错误的水域已被移除，少量水域则通过弗吉尼亚地理信息网络（Virginia Geographic Information Network, VGIN）提供的弗吉尼亚基础测绘项目航空影像，以及现有可用的最新国家水文数据集数据完成更新。