Reservoir (2024 Final WQA IR Assessment)

Show all lakes and reservoirs 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 lacustrine 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出的全部湖泊与水库。点击此处查看数据概况表（Data Fact Sheet）。 提供2024年305(b)/303(d)水质评估综合报告内所有湖相水体的评估汇总详情。 本评估单元（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。DEQ区域评估人员依托该NHD产品，根据预先划定的上下游范围以及适用的水质标准，分配此前已确定的评估单元编号。部分存在错误的水体已被移除，少量水体则基于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最新可用的NHD数据完成更新。