Invitation to Tender


Peatland re-wetting works at Taiglim Farm ‘Hill’, Glaisnock Moss, East Ayrshire

The East Ayrshire Coalfield Environment Initiative (CEI) has been carrying out peatland restoration in East Ayrshire since 2014, covering an area of 600 hectares and installing over 10,000 peat dams.

Glaisnock Moss is one of the largest unafforested blanket bogs in the East Ayrshire Coalfields. It has long been included on our list of sites of priority for restoration due to its size, condition and depth of peat. Having recently worked with the landowner at Greenfield Farm we are keen to continue to restore this promising area. There is significant opportunity to halt the degradation of the peatland, caused by historic drainage by installing peat dams and blocking drains.

A peatland restoration feasibility study of Glaisnock Moss was carried out in 2021. The study contains the following key information:

  • The majority of the peatland on site has been negatively affected by drainage ditches. There are also smaller areas which have been affected by other practices such as grazing. Large areas, particularly on the South East of the site show erosion which is a result of the combined pressures on the peatland through past management.
  • This drainage system has lowered the water table on site and has led to large sections of peatland that has hummock -hollow formation to become dried out and degraded. These sections look similar to the erosional features but the steep sides of the hummocks are still well vegetated. As a result, a complex network of small vegetated gullies has been left but with very little bare peat. Heather Calluna vulgaris is also overwhelmingly dominant throughout the site which will be from a drying of the peat layer that provides better conditions for heather to grow.
  • Natural watercourses can be found as large gullies in the South Easterly third of the site.
  • Correspondence with the landowner indicates that the majority of the site has a thickness greater than 200cm, with most of the shallower peat occurring towards the North West (lower down the hill) closer to the land deemed suitable for tree planting
  • To improve and restore the peatland hydrology and condition, site re-wetting is proposed. For ditches <1.5m width peat dams are recommended. These should be installed in 10-20 metre intervals with exact locations dependent on ground conditions and to be finalised by a suitably-experienced contractor prior to restoration. We aim to complete this project without using plastic piling dams only where alternatives are inappropriate.
  1. Peatland restoration brief

CEI will be awarding a contract for re-wetting c.28ha of peatland at Taiglim Farm, Glaisnock Moss using peat dams, surface bunds, plastic piling where necessary (minimal), and some drain re-profiling. The overall objective of the peatland restoration work is to prevent further degradation, create conditions on site to allow peat-forming vegetation to thrive and begin the process of laying down new peat layers across the site. The main aim for peatland restoration is to restrict, reduce or slow water loss from the peat bog through the ditch network, natural features, sub-surface flow and surface run-off. This is to achieve a raise in general water levels close to the peat surface and to maintain these levels. This will create conditions for peat forming vegetation to colonise and the conditions for new peat layers to be laid down.

To successfully re-wet the peat surface a number of interventions will be required, including:

  • Removal of 3 large stika (>2m) as well as sitka saplings, this can be supported by input from CEI volunteers.
  • installation of peat dams (estimated 646 dams) to varying specifications, depending on the size, depth and profile of the ditch at intervals of 15 metres (on average), using the method described by Peatland Action;
  • installation of plastic piling dams where necessary (estimated 30 dams), i.e. where the peat is shallower, on a slope, or at a terminal drain; and,
  • ditch blocking – estimated at 5,292 metres
  • Repair of failed drain on adjacent site (completed under Perfect Peatlands in 2021)

All proposed of restoration work is approximate and slight variation is expected in the proposed tender following a site visit.

Please take note of the following important information:

  • The contractor is expected to visit the site and fully acquaint themself with the full extent of the works and shall take any additional site measurements as necessary prior to submitting a tender.
  • All materials are to be supplied by contract holder and all unused materials and litter will be removed from site by the contractor.
  • Watercourses leaving this site must not be contaminated and great care must be taken to prevent sediment loading into these systems.
  • Peat dams are not to be installed where the peat depth is less than 150cm. The supplier will need to adapt the ditch-blocking methods to the on-site conditions.
  • It is vital that the ditch blocking does not result in large, deep, steep-sided pools of water that may pose a risk to sheep in the future.

Any questions or to submit your tender application please contact laura.curtismoss@ea-cei.org.uk