In My Area

Planned improvements

Elan Valley Aqueduct - Bleddfa



29 Sep 2017

Estimated completion date
Upcoming work
Work in progress
Work completed

All site reinstatement has now been completed.


End of underground tunnelling December 2016.


Start of underground tunnelling May 2016


Start work of site preparation November 2015.

Start date

05 Oct 2015

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?