D.C. Mun. Regs. tit. 19, r. 19-1029
Except with the permission of the Harbor Master, no owner, operator, or person otherwise in charge or control of any vessel shall allow that vessel to enter into or remain in any area in District of Columbia waters designated by the Mayor or other proper authority as a restricted area for use for a regatta, race, marine parade, marine tournament, marine exhibition, or similar organized aquatic event, or designated by the Harbor Master or other proper authority as a restricted area in the vicinity of an emergency.
The Harbor Master shall remove, or cause to be removed, and may impound any vessel entering into or remaining in any restricted area without his or her permission.
Any owner, operator, or person otherwise in charge or control of a vessel who enters into a restricted area, or fails or refuses to remove the vessel from a restricted area, shall be in violation of this section.
Nothing contained in this section shall be construed as prohibiting the passage through restricted areas of vessels operated by the governments of the United States or District of Columbia.
This section and other applicable provisions of this chapter shall be controlling as to any aquatic event held in District of Columbia waters, except to the extent that they are inconsistent or in conflict with any laws or regulations administered by the Coast Guard relating to a particular aquatic event held under the supervision of the Coast Guard.
Whether using self-contained or surface-supplied air or engaged in mixed gas diving within the meaning of 29 CFR § 1910.402, a person diving in District of Columbia waters shall display, in the manner provided by the Mayor by regulation, a diving flag of a type approved by the Mayor. The flag shall be red in color with a white diagonal stripe.
No vessel, except for the vessel or vessels attending the diver, shall operate within one hundred fifty feet (150 ft.) of any flag displayed in accordance with § 1029.6.
Nothing contained in this section shall be construed as amending, superseding, or in any way changing the prohibition against diving contained in 21 DCMR § 530.
D.C. Mun. Regs. tit. 19, r. 19-1029