55 Pa. Stat. § 391
The commissioners shall make rules for regulating, stationing and anchoring ships, vessels, and boats in the river Delaware and its navigable tributaries, or at the wharves, piers, or bulkheads, or in the docks, slips, or basins extending into or on the said 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.
55 P.S. § 391