Llanishen Reservoir

David Jones Excerpts

Tuesday 6th July 2010 Commons Chamber

[The Parliamentary Under-Secretary of State for Wales (Mr David Jones)]

I congratulate my hon. Friend the Member for Cardiff North (Jonathan Evans) on securing this debate, which is important both for his constituents and, because it concerns Government policy on reservoir safety, for the whole country.

As my hon. Friend will appreciate and as he identified, the case of the Llanishen reservoir is complex, and today is not the first occasion on which the matter has been ventilated on the Floor of the House—as recently as last February, it was referred to by his predecessor, Julie Morgan, in the St David’s day debate. The case of Llanishen reservoir involves consideration not only of reservoir safety, but of protection of the environment, planning law and listed buildings consent. While matters relating to the safety of reservoirs in Wales are devolved, and I know that the Welsh Assembly Government Minister for Environment, Sustainability and Housing has been monitoring events closely, the Environment Agency is responsible for enforcing matters of reservoir safety in Wales.

The Reservoirs Act 1975, as amended, sets out the safety regime for reservoirs in England, Wales and Scotland. Llanishen reservoir is a large raised reservoir under the terms of the Act, that is to say one designed to hold or capable of holding more than 25,000 cubic metres of water above the natural level of the land. As such, it should—pursuant to section 10 of the Act—be inspected by a qualified inspecting engineer at least every 10 years.

As my hon. Friend said, Llanishen reservoir was last inspected in 2008 and the inspecting engineer made a number of recommendations relevant to its safety. He recommended that a survey of all valves and pipework in the reservoir should be carried out to check their layout and condition. Although he did not specifically require a drain-down of the reservoir, he pointed out that this would be necessary in order for its operator, Western Power, to implement his recommendations. Once such recommendations have been submitted by the engineer, there is a legal obligation on the operator to implement any necessary measures as soon as practicable. In the case of Llanishen, the inspection report specified that these should be done within 12 months.

Western Power did not complete these measures on time so the Environment Agency served an enforcement notice on the company. That notice required the company to complete the outstanding safety measures within an agreed timescale. Western Power elected to draw down the reservoir to carry out a visual inspection of the pipework. It began drawing down the water on 26 February 2010 by siphoning water over the reservoir embankment and into the Nant Fawr stream. The water level within the reservoir has been lowered by approximately 4 metres. The siphoning has now stopped.

Although the Environment Agency has no legal powers to prevent the draw-down from happening, it has written to the company to emphasise that in the agency’s view the company does not necessarily need to drain down Llanishen reservoir in order to carry out the safety inspections identified by the inspecting engineer. However, should the company insist on completing the draw-down, the company needs an environmental permit or discharge consent from the agency to proceed. This document is issued under section 85 of the Water Resources Act 1991 and gives permission to discharge water that may contain silts or sediments—such as in reservoir water— sewage or trade effluents directly into surface waters, rivers, streams, canals, groundwater or the sea. In fulfilling its obligations under this Act, the Environment Agency determines environmental permit applications to regulate the water being discharged in order to protect water quality, the environment and human health.

During its consultation on the application, which was advertised in the South Wales Echo, the agency received a number of comments from the local community, including some from the Llanishen reservoir action group. These comments are being considered as part of the agency’s assessment of the application. If Western Power proves to the agency’s satisfaction that the draw-down will not cause any detrimental effect on the Nant Fawr stream, its wildlife or the local environment, the agency is obliged to issue an environmental permit. However, if granted, the permit will place appropriate conditions on the company to minimise the risk of pollution or damage to the local environment.

The SSSI status conferred upon the Llanishen reservoir embankments by the Countryside Council for Wales in September 2005, which was confirmed in May 2006, will no doubt be an important factor in the agency’s assessment. I understand that Western Power has consulted the Countryside Council on its plans for the reservoir. The listed building status of the dam attached to the reservoir by Cadw is also an important factor to be taken into account, but it is my understanding that no application for listed building consent has been submitted by the company in relation to the drain-down. In any case, consideration of any such application would be a matter for Cardiff city council as the appropriate authority. If at any time the Environment Agency comes to believe that the reservoir has become unsafe or detects any damage or pollution to the environment from the further draw-down proposed by Western Power, proportionate enforcement action will be taken against the company.

I recognise and share my hon. Friend’s concerns over the many issues he has identified in relation to the reservoir at Llanishen. I hope also that I may reassure him of the importance I attach to the debate on matters that are not just of concern to local communities, but which might indeed have wider implications and which I intend to take steps to pursue. I therefore intend to write to the Welsh Assembly Government Minister with responsibility for the environment and sustainability, Jane Davidson, who has devolved responsibilities in this matter, to convey the concerns raised in the House this evening. I intend also to write in a similar vein to Robert Symons, the chief executive of Western Power, to urge that his company engages with interested parties in this matter.

As my hon. Friend has so eloquently pointed out, the Llanishen case has highlighted the fact that, whereas a reservoir operator has a means of challenging a determination by the Environment Agency, current legislation does not provide for reconsideration by an inspecting engineer of his report once it has been submitted to the operator, even if new information or a contrary view is provided from another source. That seems to be an issue that merits further reflection. I therefore intend also write to my hon. Friend the Member for Newbury (Richard Benyon), the Under-Secretary at the Department for Environment, Food and Rural Affairs with responsibility for the natural environment and fisheries, to ask him to consider the scope for addressing this apparent anomaly in the course of the Government’s implementation of section 4 of the Flood and Water Management Act 2010, which will introduce a risk-based approach to the assessment of reservoir safety, and on which the Government will consult in due course.

[Jonathan Evans]

The reservoir action group and local residents will be very pleased to hear my hon. Friend’s statements from the Dispatch Box. Within his busy schedule, when he is in Cardiff on some convenient occasion, will he take the opportunity to visit the reservoir and meet the interested parties and locally elected representatives, as I challenged Mr Clarke to do during my earlier remarks? Bearing in mind what my hon. Friend has said, there will be people who will wish to take the opportunity to thank him for his interest.

--- Later in debate ---

[Mr Jones]

I shall be pleased to accept that invitation.

I will place copies of all the letters to which I have referred in the Library of the House. I hope that the process that I have outlined will give my hon. Friend the assurance he needs that the safety and environmental impact of the operation of Llanishen reservoir, as well as the concerns of his constituents and the wider community in Cardiff, are being given the priority and attention the matter deserves.

Question put and agreed to.