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Mapping groundwater vulnerability: the Irish perspective

Donal Daly and William P. Warren
Geological Society, London, Special Publications, 130, 179-190, 1 January 1998, https://doi.org/10.1144/GSL.SP.1998.130.01.16
Donal Daly
Geological Survey of Ireland, Beggars Bush Haddington Road, Dublin 4, Ireland
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William P. Warren
Geological Survey of Ireland, Beggars Bush Haddington Road, Dublin 4, Ireland
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Abstract

The groundwater protection scheme used in the Republic of Ireland since the 1980s had not encompassed the vulnerability mapping concept. Yet internationally, vulnerability maps were becoming an essential part of groundwater protection schemes and a valuable tool in environmental management. Consequently, following a review of protection schemes world-wide, the scheme used in Ireland was updated and amended to include vulnerability maps as a crucial component of the scheme.

The approach taken to vulnerability assessments and mapping in the Republic of Ireland has been dictated by the following fundamental questions: Vulnerability of what? Vulnerability to what? Which factors determine the degree of vulnerability? What is the appropriate scale for map production? How can limitations and uncertainties be taken into account? How can vulnerability assessments be integrated into environmental and resource management?

The following decisions were made: (i) we should map the vulnerability of groundwater, not aquifers or wells/springs; (ii) the position in the groundwater system specified to be of interest is the water-table (i.e. first groundwater encountered) in either sand/gravel aquifers or in bedrock; (iii) we should map the vulnerability of groundwater to contaminants generated by human activities (natural impacts are a separate issue); (iv) as the main threat to groundwater in Ireland is posed by point sources, we should map the vulnerability of groundwater to contaminants released at 1–2 m below the ground surface; (v) the characteristics of individual contaminants should not be taken into account; (vi) the natural geological and hydrogeological factors that determine vulnerability are the sub-soils above the watertable, the recharge type (whether point or diffuse) and, in sand/gravels, the thickness of the unsaturated zone; (vii) based on these factors, four vulnerability categories are used (extreme, high, moderate and low); (viii) map scales of 1:50 000 and 1:10 000 are preferred; (ix) limitations and uncertainties are indicated by appropriate wording on the maps and a disclaimer; (x) vulnerability maps should be incorporated into groundwater protection schemes, which should be used in decision-making on the location and control of potentially polluting developments.

Vulnerability maps have now been produced for a number of local authority areas. They are an important part of county groundwater protection schemes as they provide a measure of the likelihood of contamination, assist in ensuring that protection schemes are not unnecessarily restrictive of human economic activity, help in the choice of engineering preventative measures, and enable major developments, which have a significant potential to contaminate, to be located in areas of relatively low vulnerability and therefore of relatively low risk, from a groundwater perspective.

  • © The Geological Society 1998

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Geological Society, London, Special Publications: 130 (1)
Geological Society, London, Special Publications
Volume 130
1998
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Mapping groundwater vulnerability: the Irish perspective

Donal Daly and William P. Warren
Geological Society, London, Special Publications, 130, 179-190, 1 January 1998, https://doi.org/10.1144/GSL.SP.1998.130.01.16
Donal Daly
Geological Survey of Ireland, Beggars Bush Haddington Road, Dublin 4, Ireland
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William P. Warren
Geological Survey of Ireland, Beggars Bush Haddington Road, Dublin 4, Ireland
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Mapping groundwater vulnerability: the Irish perspective

Donal Daly and William P. Warren
Geological Society, London, Special Publications, 130, 179-190, 1 January 1998, https://doi.org/10.1144/GSL.SP.1998.130.01.16
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