Inny Arterial Drainage Scheme 2020 - 2024
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1 Galway Business Park, Dangan, Galway H91A3EF 173 Ivy Exchange, Granby Place, Parnell Square West, Dublin 1 Arterial Drainage Maintenance Works: Inny Arterial Drainage Scheme 2020 - 2024 Natura Impact Statement Rev 1 February 2020 Natura Impact Statement Page Report Control Sheet FORM 214 Rev 002 Business Management System Client Office of the Public Works Project No. 2514 Project Title Inny Arterial Drainage Scheme 2020-2024 Report Title OPW Arterial Drainage Maintenance Inny NIS Rev. Status Authors Reviewed By Approved By Issue Date Issued to A. Michaelides 1 S. Gavin D. Bourke 03/12/2019 Client / S. Gavin In response 2 to comments Grace Kilbane S. Gavin D. Bourke 26/02/2020 from NPWS Natura Impact Statement Page i Inny Arterial Drainage Scheme - NIS Executive Summary Ryan Hanley has been commissioned by the Office of Public Works (OPW) to provide environmental consultancy services in relation to statutory arterial drainage maintenance activities for 2019. Following the methodology outlined in Ryan Hanley (2014a), a screening assessment was conducted to assess the likely significant effects on European sites of the proposed drainage maintenance activities in the Inny Arterial Drainage Scheme in accordance with Article 6(3) of the Habitats Directive (Council Directive 92/43/EEC on the conservation of natural habitats and of wild fauna and flora). Three “source > pathway > receptor” chains were examined to assess the likely impact of drainage maintenance activities on European sites; surface water, land and air, and groundwater pathways. The results of this screening exercise identified that significant adverse impacts could not be excluded on the following European sites: ▪ Ardagullion Bog SAC (002341) ▪ Ballymore Fen SAC (002313) ▪ Garriskil Bog SAC (000679) ▪ Lough Ree SAC (000440) ▪ Moneybeg and Clareisland Bogs SAC (002340) ▪ Garriskil Bog SPA (004102) ▪ Glen Lough SPA (004045) ▪ Lough Derravaragh SPA (004043) ▪ Lough Iron SPA (004046) ▪ Lough Kinale and Derragh Lough SPA (004061) ▪ Lough Ree SPA (004064) ▪ Lough Sheelin SPA (004065) As a result, it was necessary to conduct a Stage 2 Appropriate Assessment to further examine the potential direct and indirect impacts of the proposed works on the integrity and interest features of the above European sites, alone and in-combination with other plans and projects, taking into account the site's structure, function and conservation objectives. Further examination of the potential sources of impact on the European sites above, looking at surface water and land and air pathways, was conducted. Where potentially significant adverse impacts were identified, a range of mitigation and avoidance measures have been stipulated to help offset them. As a result of this Appropriate Assessment it has been concluded, that given the avoidance and mitigation measures suggested, the proposed drainage maintenance operations in the Inny Arterial Drainage Scheme will not have a significant adverse impact on the above European sites. Natura Impact Statement Page ii Inny Arterial Drainage Scheme - NIS Contents Executive Summary .............................................................................................................................. ii 1 Introduction ............................................................................................................................... 1 1.1 Background .......................................................................................................................................... 1 1.2 Legislative Context ............................................................................................................................... 1 1.3 Appropriate Assessment Process ........................................................................................................ 1 1.4 1.4 Methodology ................................................................................................................................. 3 2 Arterial Drainage Maintenance ................................................................................................. 5 2.1 Background .......................................................................................................................................... 5 2.2 Drainage Maintenance Activities ......................................................................................................... 5 2.3 The Inny Arterial Drainage Scheme ................................................................................................... 12 2.4 Drainage Maintenance Works Proposed for the Inny Arterial Drainage SchemeError! Bookmark not defined. 3 Screening Assessment Results.............................................................................................. 15 3.1 Introduction ........................................................................................................................................ 15 3.2 Screening Assessment Conclusions ................................................................................................. 21 4 European Sites within the Zone of Influence of Drainage Maintenance Activities ............. 24 4.1 Introduction ........................................................................................................................................ 24 4.2 Ardagullion Bog SAC (002341) .......................................................................................................... 24 4.3 Ballymore Fen SAC (002313) ............................................................................................................ 25 4.4 Garriskil Bog SAC (000679) .............................................................................................................. 26 4.5 Lough Ree SAC (000440) ................................................................................................................. 27 4.6 Moneybeg and Clareisland Bogs SAC (002340) ............................................................................... 30 4.7 Garriskil Bog SPA (004102) ............................................................................................................... 31 4.8 Glen Lough SPA (004045) ................................................................................................................. 32 4.9 Lough Derravaragh SPA (004043) .................................................................................................... 33 4.10 Lough Iron SPA (004046) .............................................................................................................. 34 4.11 Lough Kinale and Derragh Lough SPA (004061) .......................................................................... 35 4.12 Lough Ree SPA (004064) .............................................................................................................. 36 4.13 Lough Sheelin SPA (004065) ........................................................................................................ 38 4.14 Description of the receiving environment - Ecological Walkover Survey Results ......................... 40 5 Appropriate Assessment ........................................................................................................ 50 5.1 Introduction ........................................................................................................................................ 50 5.2 Identification of Potential Sources of Impact ..................................................................................... 50 5.3 Impact Assessment ............................................................................................................................ 53 6 Avoidance and Mitigation Measures ...................................................................................... 95 6.1 Introduction ........................................................................................................................................ 95 6.2 Mitigation for Other Ecological Receptors ......................................................................................... 96 6.3 Mitigation for Bridge/Structure Works ................................................................................................ 97 7 Conclusions ............................................................................................................................. 98 Natura Impact Statement Page iii Inny Arterial Drainage Scheme - NIS Appendix A............................................................................................................................. Maps of Channels within the Inny 2020 – 2024 Programme................................................. ii Inny 2020 – 2024 Maintenance Programme............................................................................ viii Natura Impact Statement Page iv Inny Arterial Drainage Scheme - NIS List of Figures Figure 1.1 The Appropriate Assessment Process (from: Appropriate Assessment of Plans and Projects in Ireland - Guidance for Planning Authorities, DEHLG, 2009) ...................................................................................................................... 2 Figure 1.2 Screening assessment process ...................................................................................................................................... 3 Figure 2.1 Plane Bed to Low Gradient Channels in the Inny Arterial Drainage Scheme .................................................... 7 Figure 2.2 Map of the Inny Scheme .............................................................................................................................................