No person shall throw, cast, or deposit in or upon any street, avenue, alley, highway, footway, or sidewalk any snow that may have fallen upon or ice that may have accumulated on the roof of any building or other structure.
If necessary for public safety to remove snow or ice from the roof of any building or structure, and it is impracticable to do so without violating the prohibition in § 1005.1, that prohibition shall be waived if the person offending the prohibition immediately removes the snow or ice that has been thrown, cast, or deposited on the street, avenue, alley, highway, footway, or sidewalk.
D.C. Mun. Regs. tit. 24, r. 24-1005