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SusceptibilityEqual intervalManual methodFrom toFrom toExtremely high 230 269 250 269Very high 192 230 220 250High 154 192 180 220Medium 115 154 140 180Low 77 115 90 140Very low 38 77 50 90Extremely low 0 38 0 50Table 5.9a. Equal interval and manual method divisions applied to Bedrock slides.SusceptibilityEqual intervalManual methodFrom toFrom toExtremely high 276 322 300 322Very high 230 276 270 300High 184 230 230 270Medium 138 184 170 230Low 92 138 110 170Very low 46 92 60 110Extremely low 0 46 0 60Table 5.9b. Equal interval and manual method divisions applied to Peat slidesSusceptibilityEqual intervalManual methodFrom toFrom toExtremely high 194 226 210 226Very high 161 194 190 210High 129 161 160 190Medium 97 129 130 160Low 65 97 90 130Very low 32 65 50 90Extremely low 0 32 0 50Table 5.9c. Equal interval and manual method divisions applied to Flows.SusceptibilityEqual intervalManual methodFrom toFrom toExtremely high 237 276 255 276Very high 197 237 230 255High 157 197 200 230Medium 118 157 150 200Low 79 118 100 150Very low 39 79 60 100Extremely low 0 39 0 60Table 5.9d. Equal interval and manual method divisions applied to Falls.64
6. LANDSLIDES AND PLANNINGAileen Doyle6.1 IntroductionThe focus of this chapter is landslide hazard and the planning process. It will look at current practice in dealingwith development on unstable or potentially unstable land in Ireland and the UK, and will focus on those partsof the planning system which interface directly with the issue of landslides such as the preparation of developmentplans and the development management system. It will also briefly look at building control both in Ireland andthe UK. Current practice on landslides and planning in Northern Ireland will be dealt with in Chapter 7- Landslidesin Northern Ireland.There are other areas of human activity which may impact on landslide risk such as agriculture or forestry butwhich are exempt from the requirements for planning permission. These may however be subject to otherconsent procedures such as Natural Heritage Areas (NHA) which are subject to separate conservation measures.An awareness of ground instability or the potential for instability by persons carrying out such activities wouldalso be important.The chapter will also highlight the type of information needed to aid in the integration of landslide hazardassessment into land use planning and will conclude with a number of recommendations on the steps whichneed to be taken to promote awareness of the issue of landslide hazard and the planning process.The chapter should be read in the context that the primary responsibility for dealing with the potential hazard oflandslides in relation to particular developments lies with the developer.6.2 Current Practice on Landslides and Planning in IrelandThe Planning and Development Acts 2000-2004 provide the legal framework for the Irish planning system. Thesystem operates through a hierarchy of plans which include at National level, Ministerial Guidelines and theNational Spatial Strategy (NSS), at Regional Level, the Regional Planning Guidelines (RPGs) and at localauthority level, the development plan and development management process.6.2.1 Ministerial GuidelinesUnder Section 28 of the Planning and Development Act 2000, the Minister for the Environment, Heritage andLocal Government may at any time issue guidelines to planning authorities regarding any of their functionsunder the Act. Planning authorities and, where applicable, An Bord Pleanala, are obliged to have regard to suchguidelines in the performance of their functions. National guidelines which contain advice of relevance todevelopment on unstable ground are:“Guidelines on Quarrying and Ancillary Activities (2004)” and“Draft Wind Energy Development Guidelines (2004)”These documents provide guidance to planning authorities on how to deal with quarrying activities and windenergy development at development plan and planning application stages. Land instability is addressed in boththese documents but more particularly in the Wind Energy Development Guidelines, currently in draft form,which contains strengthened guidance in relation to the geotechnical aspects of wind energy developments.To date however, there is no national planning guidance on the specific issue of landslides. The question ofwhether or not there is a need for such national guidance will be addressed in the recommendations at the endof this chapter.6.2.2 Regional Planning GuidelinesRegional Planning Guidelines (RPGs) to support the implementation of the National Spatial Strategy wereadopted by all the Regional Authorities at the end of May 2004. The RPGs work within the overall approach65
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Landslides in IrelandGeological Sur
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LANDSLIDESinIRELANDEditorRonnie Cre
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CONTENTSPreface ...................
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Fig. 4.3 Forces caused by water in
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PREFACEUntil recently Ireland has b
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een very important in populating th
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involves a report on the current st
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Main Objectives• Increase public/
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1. INTRODUCTIONRonnie Creighton1.1
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1.3 The Landslides PublicationThis
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Peat flows are not nearly so well d
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In Ireland the Quaternary or uncons
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Journal - published papersLetter -
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Fig. 3.1 Two images showing the use
Page 30 and 31: Table 3.1 Landslide Events Per Coun
Page 32 and 33: Fig. 3.3 Location map of the Pollat
Page 34 and 35: 3.7.4 Quaternary GeologyQuaternary
Page 36 and 37: 3.8 The Derrybrien Landslide - 2003
Page 38 and 39: • The classification scheme shoul
Page 40 and 41: The force causing the block to slid
Page 42 and 43: Plate 4.1 Herringbone drainage syst
Page 44 and 45: 1210Number of events864Raised bogBl
Page 46 and 47: It is well known by research at Uni
Page 48 and 49: 5. LANDSLIDE SUSCEPTIBILITY MAPPING
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Page 52 and 53: 5.1.4 Mapping and GISBy definition,
Page 54 and 55: Platform / sensor pixel resolution(
Page 56 and 57: For this initial run, the criteria
Page 58 and 59: 42Fig. 5.5 Peat and peaty podzols f
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Page 62 and 63: elationships between developed susc
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Page 66 and 67: 50Fig. 5.12. Landslide susceptibili
Page 68 and 69: 52Table 5.6. Landslide classificati
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Page 79: CHAPTER 5.2 - TABLE APPENDIXBedrock
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Page 85 and 86: 6.5 Current Practice on Landslides
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Page 90 and 91: 2. MudflowsPlate 7.1 Rotational Lan
Page 92 and 93: 7.2 Carboniferous Cliff Lines (Co F
Page 95 and 96: 8. RESEARCH ON IRISH LANDSLIDESKoen
Page 97 and 98: 8.4 Research. Post-2003 AbstractsTa
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Page 103 and 104: Steep slopes in glacial tillMichael
Page 105 and 106: 9. RECOMMENDATIONS FOR FUTURE WORK9
Page 107 and 108: Priority 1 Peat slides and peat str
Page 109 and 110: TEXT REFERENCESAcreman, M., 1991. T
Page 111 and 112: Skipper, J., Follett, B., Menkiti,
Page 113 and 114: APPENDIX 2Glossary of TermsBlanket
Page 115 and 116: APPENDIX 3Nomenclature for Landslid
Page 117 and 118: APPENDIX 4101
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Page 123 and 124: Hammond, R. 1979. The Peatlands of
Page 125: APPENDIX 7Useful Web Linkswww.gsi.i
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