Aqueduct lime dating
To ensure the stone bed of the aqueduct would not leak, Rennie specified the use of Pozzolana powder, a Roman invention that allows concrete to set underwater.Kudos to both Rennie and the Romans: the Lune Aqueduct is still in use today, though a £2-million “makeover” conducted in early 2011 should keep it humming along for another couple hundred years or so.At 250 meters (810 ft) long and 26 meters (86 ft) high, the Avon Aqueduct is Scotland’s longest and tallest aqueduct.Built after a design by navigable aqueduct pioneer Thomas Telford, the Avon Aqueduct features a cast iron trough supported by 12 brick and masonry arches.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.The Lune Aqueduct carries the Lancaster Canal over the River Lune in Lancaster, England.
The trough is supported by 13 brick piers that range from 8 to 11 meters (26 to 33 ft) in height.
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.
Though very much a product of the newly born Industrial Revolution, not all navigable aqueducts expressed modern designs and engineering.
Take the Lune Aqueduct, which looks like it was lifted directly from an Italian renaissance tableau.