Maryland Department of the Environment Water Quality - Tier II Stream Segments 2016

This dataset consists of a digital geospatial representation of all identified Tier II segments in the State of Maryland. Based on data collected between 1995-2015, this dataset currently contains information for 253 designated Tier II stream segments. Main segment breakpoints were determined using the 100,000:1 National Hydrography Dataset (NHD). The final designated Tier II segments are the merged sub segments that make up the 24,000:1 NHD meeting the 100,000:1 breakpoints. Tier II stream segments generally terminate at confluences, impoundment outfalls, and tidal boundaries. Last Update: 9/11/2016 Contact: Angel D. Valdez, Antidegradation Implementation Lead Maryland Department of the Environment, 1800 Washington Blvd, Baltimore, MD 21230 Phone: [phone] E-Mail: [e-mail]. Map Service Layer Link: https://mde.geodata.md.gov/mdedata/rest/services/WSA_Water_Quality/Baseline_Stations_Historical_2016/MapServer/2本数据集涵盖马里兰州境内所有已识别的二级（Tier II）河段的数字地理空间表达。本数据集基于1995年至2015年间收集的数据，目前共收录253个经指定的二级河段相关信息。河段主断点依据1:100000比例尺的国家水文数据集（National Hydrography Dataset, NHD）确定。最终划定的二级河段，是由符合1:100000比例尺断点标准的1:24000比例尺NHD子河段合并而成。二级河段通常以汇流点、蓄水坝出水口及潮汐边界作为终止节点。最后更新日期：2016年9月11日。联系方式：安吉尔·D·巴尔德斯（Angel D. Valdez），马里兰州环境部抗退化实施主管，地址：马里兰州巴尔的摩市华盛顿大道1800号，邮编21230。电话：410-537-3606；电子邮箱：[e-mail]。地图服务图层链接：https://mde.geodata.md.gov/mdedata/rest/services/WSA_Water_Quality/Baseline_Stations_Historical_2016/MapServer/2