Question: What type of water transportation system did both the Rapidan Dam Canal of the Rappahannock Navigation and the Main Line of Public Works work to establish?

<P0-S0> The office of Superintendent of Public Works was created by an 1876 amendment to the New York State Constitution. <P0-S1>  It abolished the canal commissioners and established that the Department of Public Works execute all laws relating to canal maintenance and navigation except for those functions performed by the New York State Engineer and Surveyor who continued to prepare maps, plans and estimates for canal construction and improvement. <P0-S2>  The Canal Board (now consisting of the Superintendent of Public Works, the State Engineer and Surveyor, and the Commissioners of the Canal Fund) continued to handle hiring of employees and other personnel matters. <P0-S3>  The Barge Canal Law of 1903 (Chapter 147) directed the Canal Board to oversee the enlargement of and improvements to the Erie Canal, the Champlain Canal and the Oswego Canal. <P0-S4>  In 1967, the Department of Public Works was merged with other departments into the new New York State Department of Transportation. <SEP> <P1-S0> The Rapidan Dam Canal of the Rappahannock Navigation is a canal intended to safely carry Batteaus, sturdy flat-bottomed boats used primarily for transporting cargo, around the rapids at the confluence of the Rappahannock and Rapidan Rivers. <P1-S1>  The Rapidan Canal, funded and constructed by The Rappahannock Company, consists of two different canals (the Old Rapidan Canal and the Rapidan Canal) built at different times. <P1-S2>  All of the Rappahannock Navigation, of which the Rapidan Canal is a part, is located in the Piedmont region of Virginia. <P1-S3>  The Confluence, the name used on maps of the day and sometimes maps of today to denote where the two rivers meet, is located where the borders of the Virginia Counties of Spotsylvania, Stafford and Culpeper meet but is owned by the City of Fredericksburg, Virginia. <P1-S4>  The Rapidan Canal was listed on the Virginia Landmarks Register (VLR) on June 19, 1973, and on the National Register of Historic Places on July 26, 1973. <SEP> <P2-S0> The Main Line of Public Works was a package of legislation supporting a vision passed in 1826 — a collection of various long proposed canal and road projects that became a canal system (1824 proposals and studies) and later added railroads (amendments in 1828) designed to cross the breadth of Pennsylvania (mainly, southern) with the visionary goal of providing the best commercial means of transportation between Philadelphia and Pittsburgh. <P2-S1>  Built between 1826 and 1834 by the Commonwealth of Pennsylvania, it established the Pennsylvania Canal System, the Allegheny Portage Railroad, and the Pennsylvania Canal System administrated under a new Commission. <SEP> <P3-S0> The Black Rock Dam is a low head dam in the Schuylkill River. <P3-S1>  Originally constructed as a stone filled, timber crib dam in the early 19th century by the Schuylkill Navigation Company, the dam was one of dozens built to create a slack water pools for the Schuylkill Navigation System. <P3-S2>  The dam is a contributing property of the "Schuylkill Navigation Canal, Oakes Reach Section" registered historic district. <P3-S3>  The dam is located between Phoenixville and Mont Clare in southeastern Pennsylvania, USA.