53 Pa. Stat. § 2803
To effectually carry out the provisions of this act, the borough or city authorities of any borough or city may, at any time after the passage and approval of the proper ordinance, present a petition in any court of common pleas of the proper county, setting forth at length the nature and character of the vacation, change, alteration or relocation proposed in the course or channel of any such creek, run or natural waterway, together with a description of the proposed change or improvements; and praying the court to appoint three disinterested freeholders to ascertain the damages, costs and expenses resulting from the vacation, change, alteration or relocation of the course or channel of any such creek, run or natural waterway, and to fairly and ratably assess the said damages, costs and expenses, or so much thereof as said viewers may deem just and reasonable, upon the property benefited or affected by such vacation, change, alteration or relocation, and make report thereof to court, whereupon said court of common pleas, or any law judge thereof in vacation, shall appoint three disinterested freeholders as viewers, and appoint a time, not less than twenty nor more than thirty days thereafter, when said viewers shall meet upon the line of the improvement and view the same and the premises affected thereby.
53 P.S. § 2803