Shannon South Estuary Catchment Assessment 2010-2015 (HA 24)
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Shannon South Estuary Catchment Assessment 2010-2015 (HA 24) Catchment Science & Management Unit Environmental Protection Agency December 2018 Version no. 3 Preface This document provides a summary of the characterisation outcomes for the water resources of the Shannon South Estuary Catchment, which have been compiled and assessed by the EPA, with the assistance of local authorities and RPS consultants. The information presented includes status and risk categories of all water bodies, details on protected areas, significant issues, significant pressures, load reduction assessments, recommendations on future investigative assessments, areas for actions and environmental objectives. The characterisation assessments are based on information available to the end of 2015. Additional, more detailed characterisation information is available to public bodies on the EPA WFD Application via the EDEN portal, and more widely on the catchments.ie website. The purpose of this document is to provide an overview of the situation in the catchment and help inform further action and analysis of appropriate measures and management strategies. This document is supported by, and can be read in conjunction with, a series of other documents which provide explanations of the elements it contains: 1. An explanatory document setting out the full characterisation process, including water body, subcatchment and catchment characterisation. 2. The Final River Basin Management Plan, which can be accessed on: www.catchments.ie. 3. A published paper on Source Load Apportionment Modelling, which can be accessed at: http://www.jstor.org/stable/10.3318/bioe.2016.22 4. A published paper on the role of pathways in transferring nutrients to streams and the relevance to water quality management strategies, which can be accessed at: http://www.jstor.org/stable/pdf/10.3318/bioe.2016.19.pdf 5. An article on Investigative Assessments which can be accessed at: https://www.catchments.ie/download/catchments-newsletter-sharing-science-stories- june-2016/ Table of contents 1 Introduction ....................................................................................................................................... 1 2 Water body status and risk of not meeting environmental objectives .......................... 3 2.1 Surface water ecological status ........................................................................................... 3 2.1.1 Rivers and lakes ............................................................................................................................. 3 2.1.2 Transitional and coastal (TraC) ................................................................................................. 3 2.2 Groundwater status ................................................................................................................. 6 2.3 Risk of not meeting surface water environmental objectives .................................... 8 2.3.1 Rivers and lakes ............................................................................................................................. 8 2.3.2 Transitional and coastal (TraC) ................................................................................................. 8 2.4 Risk of not meeting groundwater environmental objectives ..................................... 9 2.5 Protected areas ........................................................................................................................ 11 2.5.1 Drinking water protected areas ............................................................................................... 11 2.5.2 Bathing waters .............................................................................................................................. 12 2.5.3 Shellfish areas ................................................................................................................................ 12 2.5.4 Nutrient sensitive areas .............................................................................................................. 12 2.5.5 Natura 2000 sites ......................................................................................................................... 12 2.6 Heavily modified water bodies .......................................................................................... 12 3 Significant issues in At Risk water bodies .............................................................................. 12 4 Significant pressures ..................................................................................................................... 13 4.1 Water bodies ........................................................................................................................... 13 4.1.1 Rivers, lakes Transitional and coastal (TraC)........................................................................ 13 4.1.2 Groundwater .................................................................................................................................. 14 4.2 Pressure type ........................................................................................................................... 14 4.2.1 Agriculture ...................................................................................................................................... 14 4.2.2 Urban waste water treatment plants ..................................................................................... 15 4.2.3 Domestic waste water ................................................................................................................ 15 4.2.4 Hydromorphology ....................................................................................................................... 17 4.2.5 Industry ............................................................................................................................................ 17 4.2.6 Other ................................................................................................................................................ 17 4.2.7 Extractive industry ........................................................................................................................ 18 4.2.8 Diffuse urban ................................................................................................................................. 18 4.2.9 Forestry ............................................................................................................................................ 18 5 Load reduction assessment ....................................................................................................... 23 5.1 River water body load reductions .................................................................................... 23 5.2 TraC load reductions ............................................................................................................ 23 6 Further characterisation and local catchment assessments ............................................ 26 7 Catchment summary ................................................................................................................... 27 8 Areas for Action ............................................................................................................................ 27 8.1 Process of Selection ............................................................................................................. 27 8.2 Outcomes of process ........................................................................................................... 28 9 Environmental Objectives .......................................................................................................... 30 9.1 Surface Water ......................................................................................................................... 30 9.2 Groundwater ........................................................................................................................... 31 10 Acknowledgements ..................................................................................................................... 32 1 Introduction This catchment includes the area drained by the Rivers Deel and Maigue, and all streams entering tidal water in the Shannon Estuary between Kilconly Point and Thomond Bridge, Limerick, draining a total area of 2,033km². The largest urban centre in the catchment is the southern part of Limerick City. The other main urban centres are Newcastle West, Charleville, Kilmallock Rathkeale and Mungret. The total population of the catchment is approximately 112,430 with a population density of 55 people per km². This catchment is predominantly low lying, flat and underlain by limestones with the exception of a few isolated hills. This geology provides a significant groundwater resource in the catchment. The River Deel rises in the hills south of Dromina, flowing north and towards Newcastlewest, where it is joined by the Bonoke, Arra and Daar Rivers from the west. Continuing generally north past Rathkeale, the Deel flows into the southern side of the Shannon Estuary 2 km north of Askeaton (where the river becomes tidal). The Maigue River rises 2 km north of Milford and flows east before meeting the River Loobagh. The River Loobagh drains the south-eastern part of the catchment, North of Bruree, the Maigue is joined from the east by the Morningstar River, which drains the region from the western end of the Glen of Aherlow. The Maigue is next joined by the Camoge River, which drains the