The Planning System and Flood Risk Management - Offaly County ...

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16after periods of heavy rainfall. Permeable pavement techniques include theuse of porous tarmac or solid block pavers with gaps to provide through flowof water.Planning GuidelinesPhoto 3: Detention Basin, Carrickmines - an example of anapplication of sustainable drainage systems2.39 With regard to the increasingly frequent trend of paving over entire residentialgarden areas to provide off street car parking or hard landscaping under theexempted development provisions of the planning acts, the Department intendsto review the Exempted Development Regulations to ensure that only thosecomplying with sustainable d rainage principles will be exempted thus limitingthe run-off which would otherwise contribute to overwhelming the drainagesystemsIn the interim, in considering planning applications for new or extensions toresidential development, which include significant hard surfacing, planningauthorities should attach conditions to any grants of planning permissionswhich minimises and limits the extent of hard surfacing and paving as wellas requiring the use of sustainable drainage techniques, including in particularpermeable paving or surfaces such as gravel or slate chippings.
Chapter 3:Principles and Key Mechanisms17• The key principles of a risk-based sequential approach to managing floodhazard and potential risk in the planning system are based on a sequentialapproach and are set out in this chapter. They are:1. Avoid development in areas at risk of flooding;2. If this is not possible, consider substituting a land use that is lessvulnerable to flooding.3. Only when both avoidance and substitution cannot take place shouldconsideration be given to mitigation and management of risks.• Inappropriate types of development that would create unacceptable risksfrom flooding should not be planned for or permitted.• Exceptions to the restriction of development due to potential flood risks areprovided for through the use of the Justification Test, where the planningneed and the sustainable management of flood risk to an acceptable levelcan be demonstrated.Planning principles3.1 The approach to the integration of flood risk assessment and management inthe planning process set out in these guidelines entails the application of anumber of core principles. These principles are derived from experience offlood issues in Ireland and from international best practice and perspectives.They should inform and underpin planning policy and guidance at all levelsin the planning process.3.2 The principle actions when considering flood risk management in the planningsystem are:I. Flood hazard and potential risk should be identified and considered atthe earliest stage in the planning process. A hierarchy of national, regional,local and site-specific assessment of flood risk will enable a proportionateresponse to the consideration of flood risk.II.III.Development should preferentially be located in areas with little or noflood hazard, thereby avoiding or minimising the risk. Development inthe context of thes Guidelines includes all construction, such as transportand utility infrastructure as well as residential and other buildings.Development should only be permitted in areas at risk of flooding, whenthere are no alternative, reasonable sites available in areas at lower riskPlanning Guidelines
Page 7: At the site-specific level, develop
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Page 14 and 15: 4Planning GuidelinesReport of the F
Page 16 and 17: 6Chapter 2:Flooding - Key ConceptsP
Page 18 and 19: 82.5 Increase in flooding due to de
Page 20 and 21: 10Flood risk2.13 Understanding floo
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Page 28 and 29: 18that also meet the objectives of
Page 30 and 31: 20more than 1 in 200). Development
Page 32 and 33: 22Government under Section 28 of th
Page 34 and 35: 24Planning GuidelinesDevelopment in
Page 36 and 37: 26Chapter 4:Flooding and Spatial Pl
Page 38 and 39: 28floodplain. Effective co-ordinati
Page 40 and 41: 30Planning GuidelinesFig. 4: Develo
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Page 50 and 51: 40• these guidelines, and in part
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Page 54 and 55: 44Chapter 6:ConclusionPlanning Guid
Page 56 and 57: 46TermsDefinitionPlanning Guideline
Page 64 and 65: 54Appendix A - Screening for andCar
Page 66 and 67: 56Climate changeincreased intensity
Page 68 and 69: 58Strategic assessments provide the
Page 70 and 71: 60As part of a FRA, information on
Page 72 and 73: 62A successful FRA is characterized
Page 74 and 75: 64• Suggested policies for sustai
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66Planning Guidelines• The impact
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68An additional document on interpr
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70Table A2: The Flood Risk Balance
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72Appendix B - Addressing FloodRisk
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74Figure B2 below illustrates how t
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76drainage processes and removing p
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78• Signing of floodplain areas s
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80flood level. Care must be taken t
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82Appendix C - Frequently AskedQues
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84What does the SFRA not provide?Th
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86pressure in the embankment and ge
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Printed on recycled paper containin
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