MS4 Storm Sewer Outfalls

The dataset contains locations and attributes of the MS4 Storm Sewer outfalls created as part of the District MS4 Permit. GPS outfall locations were captured in 2004-2006 by, then, DC WASA. A database provided by WASA identified outfalls, drainage structures, and MS4 outfall locations. The data was later verified in conjunction between DOEE and DCWater along with field verification. Updates occur as needed. This data is used for planning and modeling purposes by various District programs. This data is a requirement of the District's MS4 Permit. Outfall ID Identification: 0-1999 - Originally provided outfall IDs 2000-2999 – Outfalls discovered from GIS and map analysis and later field verified 3000-3999 – Outfalls discovered during field work but with no additional info available 4000-4999 – Outfalls that can not be found in the field or cannot be verified

本数据集包含为满足特区《MS4许可》（District MS4 Permit）要求而构建的MS4（Municipal Separate Storm Sewer System，市政分离式暴雨下水道）排污口的位置与属性信息。2004年至2006年间，由时任华盛顿特区水务局（DC WASA）完成了各排污口的GPS定位数据采集工作。水务局提供的原始数据库中收录了排污口、排水构筑物及MS4排污口的位置信息。后续由特区环境局（DOEE）与华盛顿特区水务局（DCWater）联合开展实地核查，完成了该数据集的验证工作。本数据集将根据实际需求进行更新维护，特区各相关项目可将其用于规划编制与模型构建工作，同时该数据集也是特区《MS4许可》的强制合规要求内容。

排污口ID标识规则如下：
0-1999：初始配发的排污口ID；
2000-2999：通过地理信息系统（GIS，Geographic Information System）与地图分析发现，并经实地验证的排污口；
3000-3999：实地排查过程中发现但无额外补充信息的排污口；
4000-4999：实地无法找到或无法完成验证的排污口。