Elan aqueduct

[1] It delivers enormous quantities of water by gravity across the mid-Wales countryside, through north Herefordshire, south Shropshire and into the West Midlands through eleven major river valleys.

Work on the first 13 miles (21 km) of the route from the Elan Valley was started in June 1896 by Birmingham Corporation Water Department.

"Cut and cover" was essentially a brick lined channel which was manually dug as a trench, then roofed over and concealed underground.

The third construction type was the use of either bridged aqueducts or inverted syphons to cross valleys and rivers where the ground level dropped too steeply for the required hydraulic gradient to be maintained.

[27][26] The line of the buried aqueduct through woodland is marked by a 20 metres (66 ft) "exclusion zone" from which trees are removed.