Municipal Separate Storm Sewer System Area

For better understanding this layer was renamed from MS4 Sewer Shed to Municipal Separate Storm Sewer (MS4) Sewershed. This data is a requirement of the District's MS4 Permit. It is used for stormwater management and all aspects supporting efforts to comply wiht the Clean Water Act in the District.为便于理解，本图层已由MS4污水流域（MS4 Sewer Shed）更名为市政分离式雨水污水（Municipal Separate Storm Sewer，简称MS4）流域。本数据集是辖区MS4许可的法定要求数据，用于雨水管理以及支撑辖区内落实《清洁水法》相关要求的各项工作。