Reservoirs (2018 Final WQA IR Assessment)

All reservoirs and lakes identified in the 2018 Virginia 305(b)/303(d) Water Quality Assessment. Line work and attributes should not be altered except by the developer (DEQ). This dataset constitutes the United States Environmental Protection Agency (EPA) approved digital version of the assessment hydrology for Virginia. Attributes assigned to each water segment are based on attributes associated with the ID305B (assessment unit ID) entered in the statewide water quality assessment database. QA/QC checks are performed on the database prior to linking attributes to the GIS data, however errors may still occur. Please direct any questions about attribute accuracy to the Data Distributor. The geospatial product is maintained and updated by VA DEQ each assessment cycle (biennially) using the most current NHD product where revisions were made to Virginia waters, the most recent aerial photography provided by the Virginia Geographic Information Network (VGIN), and by freehand digitizing where necessary. Metadata is provided in the data Fact Sheet which contains contact information, process steps, attribute descriptions, and distribution information. Click Here to view Data Fact Sheet本数据集涵盖2018年弗吉尼亚州305(b)/303(d)水质评估中识别的所有水库与湖泊。除开发者（弗吉尼亚州环境质量部，DEQ）外，任何人不得更改该数据集的矢量要素与属性信息。本数据集为美国环境保护署（EPA）认证的弗吉尼亚州评估水文数字版本。每个水体片段所分配的属性，均基于全州水质评估数据库中录入的、与ID305B（评估单元编号）相关联的属性信息。在将属性信息关联至地理信息系统（GIS）数据之前，已对数据库开展质量保证与质量控制（QA/QC）核查，但仍可能存在疏漏。若对属性信息的准确性存有疑问，请联系数据分发方。本地理空间产品由弗吉尼亚州环境质量部（VA DEQ）在每个评估周期（每两年一次）进行维护与更新，更新依据包括：针对弗吉尼亚州水体修订的最新版国家水文数据集（National Hydrography Dataset, NHD）、弗吉尼亚地理信息网络（VGIN）提供的最新航空影像，以及必要时开展的手绘数字化工作。元数据已收录于数据概况表（Data Fact Sheet）中，该表包含联系方式、处理流程、属性说明与分发信息。点击此处查看数据概况表