Maryland Code, Environment § 5-504

A person shall obtain a permit from the Department to construct, reconstruct, change, or make an addition to any conduit, pipeline, wire cable, trestle, or other device, structure, or apparatus in, under, through, or over the bed or waters of the Potomac River. The permit is obtained upon written application to the Department. Obtaining, using, and holding this permit is subject severally to the provisions concerning permits found elsewhere in this subtitle.