Luxulyan Valley Works
CORNWALL COUNCIL | Published September 12, 2016
The Council ultimately wishes to appoint a Main Contractor to undertake the works for this heritage-led regeneration and renewable energy scheme. The project will:
1. Replace the Council’s Hydro Electric Power (HEP) turbine in the Luxulyan Valley;
2. Carry out the conservation works required to the Treffry Viaduct and the leats to provide a regular and sufficient water supply to the turbine;
3. Implement the management plan for the Valley to provide a much enhanced experience for the local community and visitors.
Each of these strands addresses key issues, and the business case is by far the strongest if all three are implemented together.
The Council owns most of the Valley, which is one of its most popular countryside sites; and the Treffry Viaduct, a Scheduled Monument and iconic structure, is owned by Cornwall Heritage Trust. The leats and Treffry Viaduct are key elements of the international importance of the Cornish Mining World Heritage Site.
It is proposed that the project will be funded by the Heritage Lottery Fund, Cornwall Heritage Trust, and Cornwall Council prudential borrowing. The cost of the new turbine will have to be entirely funded from the Council’s prudential borrowing.
The overall Project will include the necessary conservation works to the Treffry Viaduct and the 2.7 miles of the leat system that supplies water to the HEP turbine, for which Heritage Lottery funding (HLF) will be required.
The CC owned existing HEP turbine has reached the end of its economic life, and is now making a financial loss due to greatly reduced water flow as a result of Carmears Leat being dry. CC have had to cut off the water supply for Carmears Leat because it was leaking so badly through the aquaduct channel of the Treffry Viaduct.
The Viaduct is on English Heritage’s Heritage at Risk Register, and following a recent Condition Survey this Register grades the Treffry Viaduct’s condition as Poor, and the priority as A which means ‘immediate risk of further deterioration or loss of fabric’.
The same Condition Survey identifies many conservation works required to the leats, including preventative works to sections which are vulnerable to leaks and breaches. Both are of international historic importance. The aquaduct channel carrying Carmears Leat across Treffry Viaduct has recently been leaking so badly that CC has had to shut off the water flow into the leat so that the leat is now dry – even with just a sweetening flow almost all of the flow was leaking through the Viaduct structure. The viaduct also spans over the minor road and the Par to Newquay railway branch line and the condition of the viaduct presents a risk to these.
Please note: Mace have been commissioned to act on behalf of Cornwall Council (who will be the signatory to any agreement(s) with the Contractor) and the wider stakeholders. As such all queries relating to this initial part of the overall project at least should be addressed to Mace contact as supplied.