Swansea Canal coal and culm shipped from Swansea Docks suggest around 386,000 tons in 1839. The opening of the Tennant Canal to Swansea Docks in 1824 resulted in the Swansea Canal's riverside wharfs being improved, and tolls were reduced to maintain trade levels. The harbour facilities at Swansea were upgraded in 1852, when the river Tawe was diverted into a new channel to the east, and the original channel, which included the trans-shipment wharfs, became a floating harbour. A lock was constructed to give the canal boats direct access to the half-tide basin above the North Dock, and a loop of the
Swansea Reservoirs which supply Swansea include the Cray reservoir and the Lliw Reservoirs, which are operated by Welsh Water. The Local Gas Distribution company is Wales and West Utilities. There was a high rate of car crime during the 1990s. In 2002, the BBC described Swansea as a "black spot for car crime". Car crime is a central theme in the film "Twin Town", which was set in and around Swansea and Port Talbot. The football violence that Swansea experienced during the 1970s–1990s has considerably reduced, the only major clashes occurring between Swansea City supporters and Cardiff City supporters. Many matches