DC Subwatersheds

This data is a requirement of the District's MS4 Permit. It is used for stormwater management and all aspects supporting efforts to comply with the Clean Water Act in the District. This version is in local scale and may not nest with the current national watershed data.本数据集为辖区市政分离式暴雨下水道系统许可（MS4 Permit）的相关要求。其应用于辖区内的雨水管理，以及所有助力合规执行《清洁水法》的各项工作。本版本为本地尺度数据集，无法与当前的国家级流域数据集兼容嵌套。