RESIDENTS in the area are to be given the chance to learn about proposals to upgrade a reservoir.

Dwr Cymru Welsh Water is offering customers in Penllyn, living in the vicinity of Llyn Celyn, the opportunity to learn more about their plans to upgrade the reservoir and dam.

To ensure all its dams continue to operate safely, the not-for-profit utility company has them regularly inspected by independent dam engineers.

Llyn Celyn was the subject of its 10 yearly independent inspection in 2019 using the latest and current guidance for reservoirs and dams in the UK.

While the report, published in 2020, identified no issues with the safety of the dam, it did make recommendations on some changes that would be required.

These recommendations are statutory and are enforced by Natural Resources Wales.

Welsh Water must also respond to them within a defined timescale.

Stephen Shakespeare, Dwr Cymru’s dam safety manager for North Wales, said: “We take our responsibility for maintaining and operating our reservoirs and dams seriously at Welsh Water and the routine inspections we undertake help us achieve this.

“It is important to point out that the recent inspection of the dam at Llyn Celyn did not report any safety issues but as expected it made some recommendations to meet the latest guidance.”

One of the recommendations is to introduce measures to deal with any overspill that might occur at the reservoir during an exceptionally wet period that does not rely on manual intervention.

At present, control is supported by a series of valves and pipework situated in the tower and the dam structure and is managed by staff on site.

The dam already has one spillway, although the water at Llyn Celyn hasn’t risen to this level since the 1970s.

Mr Shakespeare added: “We have considered numerous options to deal with an overspill for extreme water levels and will, in the coming months, submit a planning application to Snowdonia National Park Authority.

"The proposal is to build a new additional spillway to deal with exceptionally high water levels that could potentially happen in future.”

The proposed plans will see an upgrade to the reservoir and will ensure resilience for future generations.

To give the local community more information about the plans, Welsh Water has created an online exhibition ( ) where people can visit a virtual room to view the proposed plans and find out more about the project.

The virtual room will be open until November 15.

As part of the virtual room, a live chat session has been arranged for November 3 between 4 and 6pm when visitors to the online room can put their questions directly to the project team.

If anyone isn’t able to access the virtual room, then the team will also be visiting Frongoch Camp lay-by with the Welsh Water community van on November 10.

The van will be there between 1 and 4pm, and people will be able to put questions about the project to the team.

Ground investigations have already been carried out at the site, and formal discussions on the proposed spillway have started with Snowdonia National Park Authority.

Depending on their responses, it is anticipated that a full planning application will be submitted next summer in order that the work can be completed by the middle of 2025.

Meanwhile, an application has been made to Natural Resources Wales by Dwr Cymru Welsh Water for a licence to remove the impoundment at Llyn Bran Reservoir, near Bylchau.

The object of removing the impoundment is to remove the reservoir, which is no longer required.

People can see the application documents free of charge from the on-line public register at

For public notices see the classifieds section of the Denbighshire Free Press.