D.C. Mun. Regs. r. 21-699
When used in this chapter, the following words and phrases shall have the meanings ascribed:
Fill - including any artificial fill, the depositing of earth or any other materials by artificial means, in any waters within the jurisdiction of the District of Columbia;
Permit - a duly executed permission issued by the Mayor of the District of Columbia for the construction, reconstruction, or repair of any structure in any waters within the jurisdiction of the District, for the artificial deposit of any fill in those waters, or for private dredging in those waters, or for all of these purposes.
Pierhead and bulkhead lines - the pierhead and bulkhead lines presently existing or hereafter established by the Secretary of the Army pursuant to the Rivers and Harbors Act of 1899, § 11, ( 33 U.S.C. §404 ), as amended.
Structure - including all piers, wharves, structures on wharves, bulkheads, slips, jetties, pilings, or other works located in any waters within the jurisdiction of the District of Columbia.
Waters or D.C. waters - any and all waters within the jurisdiction of the District of Columbia.
D.C. Mun. Regs. r. 21-699