Kilworth Water Supply Scheme - Geological Survey of Ireland

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general they can range anywhere from 4-2500 m d -1 within the Waulsortian Limestone.Therefore the entire ZOC is included in the inner protection area.9 Groundwater VulnerabilityVulnerability is a term used to represent the intrinsic geological and hydrogeologicalcharacteristics that determine the ease with which groundwater may be contaminated byhuman activities and depends on the thickness, type and permeability of the subsoils. Adetailed description of the vulnerability categories can be found in the “GroundwaterProtection Schemes” document (DELG/EPA/GSI, 1999).The distribution of interpreted groundwater vulnerability in the ZOC is presented in Figure 1.Outcrop, areas of shallow rock, auger holes, geophysics and topography are used to contourdepth to rock and are used along with the permeability classifications to develop thevulnerability zones. There are several outcrops and areas with subsoil thickness
Low (L) absent absent11 Potential Pollution SourcesLand use in the area is described in Section 5. The land near the source is largely grasslanddominatedand is primarily used for grazing. Agricultural activities are the principal hazard inthe area. The main potential sources of pollution within the ZOC are farmyards, runoff fromthe roads, and landspreading of organic fertilisers. Road spillage also presents a threat to thewater quality at the borehole and also to the River Funshion. The main potential pollutants arefaecal bacteria, viruses and road spillage.12 Conclusions and Recommendations♦ The borehole source is located in the Waulsortian Limestone rock unit, which is aregionally important karstified aquifer (Rk).♦ The area around the supply is generally highly or extremely vulnerable to contamination.♦ Farmyards, landspreading, runoff from the road and road spillage pose a threat to the waterquality at the source.♦ It is recommended that:1) A full chemical and bacteriological analysis of the raw water is carried out on a regularbasis.2) particular care should be taken when assessing the location of any activities ordevelopments which might cause contamination at the well.3) the potential hazards in the ZOC should be located and assessed.♦ The protection zones delineated in the report are based on our current understanding ofgroundwater conditions and on the available data. Additional data obtained in the futuremay indicate that amendments to the boundaries are necessary.♦ A more definitive understanding of the hydrogeology would require a site investigationthat would include drilling and geophysics. Geophysics and drilling would also improvethe accuracy of the vulnerability boundaries. Drilling would improve considerably theinformation on the water table, thus delineation of the boundaries could be improved.13 ReferencesDeakin, J., Daly, D. and Coxon, C. 1998. County Limerick Groundwater Protection Scheme.Geological Survey of Ireland, 61 pp.Department of the Environment and Local Government, Environmental Protection Agencyand Geological Survey of Ireland (1999) Groundwater Protection Scheme. DELG/EPA/GSIreport.Geoex Limited 1983. Report on Drilling and Testing of Exploratory and Production Wells.Kilworth, Co. Cork. Cork County Council (Northern Division).9
Page 1 and 2: Kilworth Water Supply SchemeDowning
Page 3 and 4: 1 IntroductionDowning Bridge boreho
Page 5 and 6: Waulsortian rock unit in this area
Page 7 and 8: Monitoring of untreated water analy
Page 9: 8 Delineation of Source Protection
Page 13 and 14: Appendix 1 Geological Logs of the A
Page 15 and 16: Table 2 of 2Parameter 30/3/93Conduc
Page 17 and 18: Figure 1 Groundwater Vulnerability
Page 19: Figure 3 Groundwater Source Protect

Kilworth Water Supply Scheme - Geological Survey of Ireland

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