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Investigating the Impacts of Windfarm Development on Peatlands in England: Part 1 Final Report

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Investigating the Impacts of Windfarm Development on Peatlands in England: Part 1 Final Report Natural England Commissioned Report NECR032 Investigating the impacts of windfarm development on peatlands in England: Part 1 Final Report First published 08 January 2010 www.naturalengland.org.uk Introduction Natural England commission a range of reports from external contractors to provide evidence and advice to assist us in delivering our duties. The views in this report are those of the authors and do not necessarily represent those of Natural England. Background Blanket Bog is a Biodiversity Action Plan (BAP) an appropriate response to the Environmental habitat. The peat it forms represents the largest Impact Assessment. terrestrial carbon store in the UK. Blanket Bog development is dependent on a number of very Natural England will use the findings to: specific conditions including sufficient rainfall, suitable temperature, topography and landuse. Help assess windfarm applications. Develop guidance for staff, developers and Areas of upland blanket bog without any nature local authorities. conservation or landscape designation are often targeted by wind farm developers. They are This report (Part 1) details the work and the high, exposed, windy places often sparsely main findings. Part 2 of the report contains the populated and relatively unprotected by appendices and references including: statutory regulations. Appendix A - a literature review and The development of wind farms on peat raises a comparative case studies for existing wind number of issues, some of which are not easy to farms on peat and non-peat areas in northern resolve. England. Appendix B - a set of assessment criteria to Natural England commissioned this work to: enable an appropriate response to the Environmental Impact Assessment and Understand and collate evidence of the impact recommendations for good practice for of wind farm developments on Blanket developers and local authorities. Peatland in England bogs. Develop a set of assessment criteria against which a development proposal can be tested to determine the scale of impact and enable Natural England Project Manager - Pin Dhillon-Downey, Juniper House, Murley Moss, Oxenholme Road, Kendal, LA9 7RL [email protected] Contractor - Judith Stunell, Maslen Environmental, Salts Mill, Victoria Road, Saltaire, Shipley, BD18 3LF Keywords - peat project, peatlands, wind farms, blanket bog Further information This report can be downloaded from the Natural England website: www.naturalengland.org.uk. For information on Natural England publications contact the Natural England Enquiry Service on 0845 600 3078 or e-mail [email protected]. You may reproduce as many individual copies of this report as you like, provided such copies stipulate that copyright remains with Natural England, 1 East Parade, Sheffield, S1 2ET ISSN 2040-5545 © Copyright Natural England 2010 Natural England Assessing Impacts of Wind Farm Development on Blanket Peatland in England Project Report and Guidance April 2009 FINAL REPORT Maslen Environmental part of the JBA Group Natural England Salts Mill Juniper House Victoria Road Murley Moss Saltaire Oxenholme road Shipley Kendal BD18 3LF Cumbria UK LA9 7RL t: +44 (0)1274 714 269 t: 01539 792 828 f: +44 (0)1274 714 272 www.naturalengland.org.uk www.maslen-environmental.com This page is intentionally left blank. Natural England Assessing Impacts of Wind Farm Development on Blanket Peatland in England Project Report and Guidance REVISION HISTORY Revision Ref./ Amendments Issued to Date Issued Report Stage: Initial Draft Client Contact: R. Dhillon- Date of Report: 20 March 2009 Downey Number of copies: 1 digital Report Stage: Draft Update of report including Client Contact: R. Dhillon- Date of Report: 9 April 2009 addressing NE comments and Downey some case study reporting. Number of copies: 1 digital Report Stage: Final Finalisation of report. Client Contact: R. Dhillon- Date of Report: 30 April 2009 Downey Number of copies: 1 digital, hard copy. CONTRACT This report describes work commissioned by Natural England under Order 2-9275-04-2 of 30-01-09. Natural England‟s representative for the contract was Mrs R Dhillon-Downey. Alex Jones, David Gooch, Judith Stunell, Jessie Kennedy and Susan Wagstaff of JBA Consulting, with associates Roger Meade (RMA), Alastair Headley (Plant Ecol), John McIlwaine and Graeme Swindles (Bradford University) carried out the work. Prepared by: ................................................... Judith Stunell BSc, PhD, MCIWEM, CEnv Principal Hydrologist Prepared by: ................................................... Alexander Jones BSc MSc Assistant Hydrogeologist Reviewed by: ................................................... Susan Wagstaff MA MSc C.Geol EurGeol FGS Technical Director - Hydrogeology Approved by: ....................................…............ Steve Maslen BSc MPhil MLI Director PURPOSE This document has been prepared solely as a draft report for Natural England. JBA Consulting accepts no responsibility or liability for any use that is made of this document other than by the Client for the purposes for which it was originally commissioned and prepared. Maslen Environmental part of the JBA Group www.maslen-environmental.com i Natural England Assessing Impacts of Wind Farm Development on Blanket Peatland in England Project Report and Guidance ACKNOWLEDGMENTS Malsen Environmental and Natural England would like to thank the operators of the main case study sites (Scout Moor, Wharrels Hill and Coal Clough) for agreeing access and providing information. Additionally we would like to thank those in local councils who provided EIA planning information with regard to wind farms, and Richard Lindsay of University of East London for providing reference suggestions. Maslen Environmental part of the JBA Group www.maslen-environmental.com ii Natural England Assessing Impacts of Wind Farm Development on Blanket Peatland in England Project Report and Guidance EXECUTIVE SUMMARY Assessment of the Impact of Wind Farm development on Blanket Peatland Blanket mire covers about 1.5m hectares of England, Scotland, Northern Ireland and Wales, mostly in the uplands, and is often a dominant part of our landscape. Its altitudinal limit depends on its location with the UK and is found even at sea level in the extreme north and west. It is composed of peat deposits up to several metres thick and represents a significant store of carbon as partially decomposed plant material. It is also an important biodiversity resource because of its plant communities and the animals and plants inhabiting it. It also represents a group of locations in which wind velocities are reliably high, and where the agricultural value is relatively low. The development of wind farms on peat raises a number of issues, some of which are not easy to resolve. This report describes the issues, reviews the available literature and provides guidance at stages from drawing up wind farm proposals, through Environmental Impact assessment requirements, to the provision of effective mitigation where this is possible. Although peat is a widespread substance its physical properties differ from those with which engineers are more experienced. For example, it is mostly water, relatively light and compressible, but has very low internal cohesion. As a continuous deposit that may have accumulated without interruption over several thousands of years it has a two-layered structure that enables water to flow through its top few tens of centimetres. It is waterlogged below, and the anoxic conditions make it an ideal environment for the preservation of human artefacts and even bodies, and of other biogenic indicators of past human activity and climate. The living biological (biodiversity) resource is concentrated at and above (birds) the surface where growth can take place, but is dependent on maintaining the hydrological and hydro-chemical conditions arising from the long and uninterrupted accumulation of the peat. The growth of the Sphagnum mosses and cotton sedges, so important in the continued accumulation of peat, can only occur where the rain-fed water table remains within a few centimetres of the peat surface for most of the year. Changes have taken place over time so that much of the UK‟s blanket peat is no longer peat-forming, and is described as degraded. The processes involved in degradation, such as the lowering of the water table and the concentration of surface water flow so that the peat becomes eroded from ever-widening gullies, are incremental, and can lead to complete peat loss in locations such as Holme Moss, West Yorkshire. In such areas the peat can no longer support the specific plant cover which makes up its biodiversity importance; and erosion of the peat results in sedimentation and increased colour (dissolved organic carbon) down stream which have negative impacts on water resources, such as drinking water reservoirs. Much of the UK‟s upland peat is degraded. It may retain vestiges of its previous vegetation, or contain replacement plant types characteristic of non-peat environments. The UK BAP has a target to restore 70% of the degraded area to active bog. It is against this background, of a mixed intact and degraded resource, that the potential impact of wind farms on deep peat has been assessed. Wind farm developments can have impacts at the construction, operational and de-commissioning stages. The types of impact are common to all stages, and involve: changes in water levels and flow, and dissection of the peat mass, but the duration and intensity
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