4 Pa. Code § 409.2
Section 4 of the act of June 8, 1907 ( P. L. 496, No. 322) (55 P. S. § 391) authorizes the Commissioners to make rules for regulating, stationing and anchoring ships, vessels and boats in the River and its navigable tributaries, at the wharves, piers, or bulkheads or in the docks, slips or basins extending into or on the River and its navigable tributaries, for removing, from time to time, ships, vessels, and boats in order to accommodate and make room for others or for admitting river craft to pass in and out of the docks, slips and basins, and for compelling the masters and captains of ships, vessels and boats to accommodate each other so that ships, vessels and boats shall, for a reasonable time, be entitled to berths next to the wharves, piers and bulkheads until they have landed or loaded their cargoes.
4 Pa. Code § 409.2