In My Area

Planned improvements

Elan Valley Aqueduct - Knighton



30 Nov 2019

Estimated completion date
Upcoming work

Site reinstatement complete - Novemeber 2019.

Work in progress

Tunnelling machine breakthough should take place in May 2019 (at Presteigne Road).

Work completed

Work on pipework in school field - to start April 2019.


Start of underground tunnelling - July 2019 (from Pennybont Road site).


Start downstream site set-up (Presteigne Road, B4355) - March 2018..


Start of site preparation - May 2017.


Start upstream site set-up (Pennybont Road, A488) - May 2017.

Start date

01 May 2017

There are currently no disruptions

There are currently no disruptions

There are currently no disruptions


The Elan Valley Aqueduct (EVA) is over 100 years old and so is in need of some modernisation.

We cannot shut down the EVA to carry out work, as it provides a vital water supply for Birmingham. We are therefore building new bypass sections alongside the EVA at Bleddfa, Nantmel and Knighton where the EVA needs refurbishment.

To create each bypass a shaft is first built at either end and a 3 metre diameter tunnel boring machine is then driven underground to cut the new bypass tunnel between the shafts.

Once the bypass is complete the new section is connected to the EVA. This means most of the work is not noticeable above ground and can be completed without interruption to the EVA flow.

Tunnel Boring Machine at Bleddfa

Why are we doing this?