Reservoirs (2016 Final WQA IR Assessement)

All reservoirs and lakes identified in the 2016 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.本数据集包含2016年弗吉尼亚州305(b)/303(d)水质评估中识别的全部水库与湖泊。除开发者（弗吉尼亚州环境质量部，DEQ）外，严禁修改该数据集的线要素与属性信息。本数据集为经美国环境保护署（Environmental Protection Agency, EPA）认证的弗吉尼亚州评估用水文数字数据集。各水体区段的属性信息均基于全州水质评估数据库中录入的ID305B（评估单元编号）所关联的属性。尽管在将属性关联至地理信息系统（GIS）数据前，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）于每个评估周期（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后的最新国家水文数据集（National Hydrography Dataset, NHD）、弗吉尼亚地理信息网络（Virginia Geographic Information Network, VGIN）提供的最新航空影像，以及必要时开展的徒手数字化作业。元数据详见数据概况表（Fact Sheet），其中包含联系方式、处理流程、属性说明及分发信息。