Impact of Arterial OPW Drainage Maintenance
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Natura Sites Assessment Report ------------------------------------------------------------------------------------------------------------------------------------------------------ Report for the Ecological Assessment of the Significance of Impacts of proposed scheduled Arterial Drainage Scheme channel and embankment maintenance works on SACs & SPAs. Version 4.3 December 2008 Tait Business Centre, Dominic Street, Limerick City, Ireland. t. +353 61 313519, f. +353 61 414315 e. [email protected] w. www.ecofact.ie OPW Natura Sites Assessment Report ____________________________________________________________________________________________ Report for the Ecological Assessment of the Significance of Impacts of proposed scheduled Arterial Drainage Scheme channel and embankment maintenance works on SACs & SPAs. William O’Connor PhD, MSc, CBiol, CEnv, MIBiol, MIEEM, MIFM Daireann McDonnell, MSc, MIEEM Ecofact Environmental Consultants Ltd., Tait Business Centre, Dominic Street, Limerick City. t. +353 61 419477 f. +353 61 414315 e. [email protected] w. www.ecofact.ie Citation: O’Connor, W., & McDonnell, D. (2008) Report for the Ecological Assessment of the Significance of Impacts of proposed scheduled Arterial Drainage Scheme channel and embankment maintenance works on SACs & SPAs. A Report to the Environment Section of the Office of Public Works. Cover photo: Weed cutting boat operating on the lower reaches of the Cregg River, Lough Corrib SAC. © Office of Public Works, 2008 ___________________________________________________________________________________ www.ecofact.ie Page | 2 OPW Natura Sites Assessment Report ____________________________________________________________________________________________ SUMMARY This report is the output of a project entitled ‘Ecological Impact Assessment of the Significance of Impacts of Proposed Scheduled Arterial Drainage Scheme Channel and Embankment Maintenance Works on Special Areas of Conservation (SACs) and Special Protection Areas (SPAs)’. The assessment concerns the 2008 Arterial Drainage Maintenance Programme within Natura 2000 Sites. The key aim of the report was to assess whether the proposed works would be likely to have a significant adverse effect on the respective conservation sites, or individual protected flora and fauna species. The assessment was based on an initial desk based screening assessment prepared for each affected site by the Environment Section of OPW, and a subsequent desk and partial field-based appraisal carried out by ECOFACT. The current study has concluded that the current strategic approach being developed by OPW to assess the ecological impact of drainage maintenance works is insufficient due to the complexity of channel types, habitats and species potentially affected by these works. However, the significant improvements that have been made in the environmental performance of the OPW in recent years are acknowledged. Likewise, the significant enhancement works being undertaken by OPW on Irish Rivers in association with the Central Fisheries Board is also noted. However, the current assessment must return the conclusion of the likelihood of significant adverse effects on the respective designated sites due to lack of information at present to reach an alternative conclusion. Recommendations on future assessments are made; in particular the requirement for advance ecological surveys on all affected river corridors is highlighted. This would allow the implementation of site specific mitigation measures to protect the integrity of these internationally important conservation sites. TABLE OF CONTENTS 1 INTRODUCTION ....................................................................................................................... 6 1.1 PROJECT OVERVIEW ....................................................................................................................... 6 1.2 INTRODUCTION TO ARTERIAL DRAINAGE SCHEMES & ARTERIAL DRAINAGE MAINTENANCE .......................... 8 1.2.1 History of the OPW ........................................................................................................... 8 1.2.2 History of Arterial Drainage Schemes ............................................................................... 8 1.2.3 Functions of Arterial Drainage Schemes ........................................................................... 9 1.2.4 Ecological Impact of the Arterial Drainage Schemes ...................................................... 10 1.2.4 Arterial Drainage Maintenance Works ........................................................................... 10 1.3 INTRODUCTION TO THE CURRENT ECOLOGICAL ASSESSMENT PROJECT .................................................... 13 1.3.1 General overview ............................................................................................................ 13 1.3.2 Special Areas of Conservation (SACs) & Special Protection Areas (SPAs) ....................... 15 1.3.3 OPW Categories for Conservation Aspects ..................................................................... 16 2 METHODOLOGY ..................................................................................................................... 18 2.1 DESK STUDY OF AFFECTED SITES ...................................................................................................... 18 2.2 REVIEW OF OPW DESK BASED ASSESSMENTS .................................................................................... 18 2.3 FIELD SURVEY .............................................................................................................................. 18 2.4 EVALUATION OF OPW ASSESSMENTS .............................................................................................. 19 2.5 CONSULTATION ........................................................................................................................... 20 3 DESK STUDY ASSESSMENT ...................................................................................................... 22 3.1 DESCRIPTIONS OF NATURA SITES SELECTED BY OPW .......................................................................... 22 3.1.2 Charleville Wood SAC ...................................................................................................... 23 ___________________________________________________________________________________ www.ecofact.ie Page | 3 OPW Natura Sites Assessment Report ____________________________________________________________________________________________ 3.1.1 Lough Ennell SAC/SPA ..................................................................................................... 24 3.1.3 Lough Owel SAC/SPA ...................................................................................................... 24 3.1.4 Ballyteigue Burrow SAC/SPA ........................................................................................... 25 3.1.5 Ryewater Valley SAC ....................................................................................................... 26 3.1.6 Split Hills and Long Hill SAC ............................................................................................. 26 3.1.7 River Boyne & Blackwater SAC ........................................................................................ 27 3.1.8 Ballymore Fen SAC .......................................................................................................... 28 3.1.9 Moneybeg & Clare Island SAC ......................................................................................... 28 3.1.10 Mount Hevey Bog SAC .................................................................................................... 28 3.1.11 Lough Derravaragh SPA .................................................................................................. 29 3.1.12 Lough Kinale & Derragh SPA ........................................................................................... 30 3.1.13 Stabannan-Braganstown SPA ......................................................................................... 30 3.1.14 Curraghchase Woods SAC ............................................................................................... 31 3.1.15 Barroughter Bog SAC ...................................................................................................... 31 3.1.16 Derrycrag Wood Nature Reserve SAC ............................................................................. 31 3.1.17 Tory Hill SAC .................................................................................................................... 32 3.1.18 Castlemaine Harbour SAC/SPA ....................................................................................... 32 3.1.19 Lower Shannon River SAC ............................................................................................... 33 3.1.20 Bandon River SAC ............................................................................................................ 34 3.1.21 Askeaton Fen Complex SAC ............................................................................................. 35 2.1.22 Slieve Aughty SPA ........................................................................................................... 36 3.1.23 River Cashen Estuary SPA ............................................................................................... 36 3.1.24 Lough Derg SAC/SPA ....................................................................................................... 36 3.1.25 Rivers Shannon and Fergus