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The Pontcysyllte Aqueduct was added to the UNESCO World Heritage List in June of 2009.The aqueduct is used regularly by pleasure boaters and commercial “narrowboats”, and once every 5 years it’s drained (by removing a plug) for cleaning and routine maintenance.
In an age when railroads and commercial highways had yet to be invented, these elevated artificial water bridges proved their worth at the time and have continued to do so for over two hundred years.Though the canal has been abandoned, the Longdon Aqueduct and its accompanying towpath remain mainly intact and have been designated a Grade I listed structure.Emboldened by the success of the Longdon Aqueduct, engineer Thomas Telford moved on to bigger things: the Pontcysyllte Aqueduct in Wales.The liquid nature of all navigable aqueducts’ “roads” means water levels rise and fall depending on a variety of factors, mainly rainfall in the region.As such, most large navigable aqueducts were built with overflow outlets much like the one in your bathroom sink.Chirk Aqueduct is a 21 meter (70 ft) high, and 220 meter (710 ft) long navigable aqueduct that carries the Llangollen Canal from Wales to England, or vice versa.
Completed in 1801 after a 5-year-long construction period, Chirk Aqueduct is another Thomas Telford design with a cast iron trough concealed by masonry walls and piers.) Aqueduct may have been the height -literally – of technology at the time, but its construction involved some surprisingly unusual and ancient techniques.One example is the mortar used to cement the masonry piers: it was made from water, lime, and ox blood!The Lune Aqueduct carries the Lancaster Canal over the River Lune in Lancaster, England.Designed by John Rennie following classical architectural techniques, the Lune Aqueduct supports the canal and towpath 19 meters (62 ft) over the River Lune on 5 arched brick piers.The 145 meter (475 ft) Edstone Aqueduct is the longest aqueduct in England.