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

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24Planning GuidelinesDevelopment in defended areas3.13 A defended area is a location that benefits from an existing flood relief schemeor flood defences that reduce the probability of flooding of the location. Landbehind such defences can be particularly vulnerable due to the speed offlooding when overtopping or a breach or other failure occurs. It is importantto note that a residual risk of flooding remains to such defended locationsand thus the sequential approach and the Justification Test apply to theseareas. The range of residual risks is described in Appendix A and B. Thepresence of defences can also increase the probability of flooding from causesother than river and coastal flooding, e.g. by preventing the discharge ofoverland flow or sewer flooding due to intense rainfall events, which are likelyto become more frequent as a result of climate change.3.14 Given this residual risk, planning authorities should apply the JustificationTest in each and every case, when considering development vulnerable toflooding in areas that benefit from such flood defences or relief schemes. Ifthe development, including infrastructure, passes Part 1 of the JustificationTest, the development of residual flood risk management strategies andmeasures (refer to Appendix B) can factor in the presence of flood defencesand their effectiveness during a flood event.Flooding and Strategic Environmental Assessment3.15 The Planning Guidelines for Strategic Environmental Assessment (SEA)(DEHLG, 2004) outline an integrated process for SEA and plan-making. SEAis required to be undertaken for Regional Planning Guidelines, developmentplans and variations, many local area plans and SDZ planning schemes.3.16 The SEA process provides a good practice framework for scoping andconsidering a range of planning and environmental issues, including floodingin the plan making process. The flood risk assessment should be integratedwith this process where a full environmental report is required. This floodrisk assessment should be undertaken as early as possible in the process sothat the SEA is fully informed of the flood risks and impacts of the proposedzoning or development (See Appendix A).Important elements of the process and report include:• scoping, which should identify likely and significant flooding issues;• consideration of flooding as one of the environmental criteria for thearea, if appropriate;• evaluation of strategic alternatives against the environmental criteria;
• detail on the likely significant effects of the plan on flooding in the planarea;25• aspects of mitigation and management for flooding; and• monitoring measures for flooding.3.17 SEAs are not mandatory for certain LAPs below a certain scale and nonstatutoryplans. However, a screening process is required for most LAPs andthis should identify any significant flooding issue. The SEA process is triggeredwhere the plan is likely to have a significant effect on the environment regardlessof thresholds. While non-statutory plans and studies have an important roleto play in promoting integrated and sustainable development, they are notan appropriate means of strategic area planning where flood risk is a significantissue.3.18 In relation to development management, Environmental Impact Assessments(EIA) are required for certain types of development which exceed definedthresholds and for other types and below-threshold developments by reasonof likely significant impacts on the environment. For further information, seealso sections 5.16 to 5.18.3.19 As indicated in the Department’s Circular Letter SEA 1/08 & NPWS 1/08,appropriate assessments are required for plans and programmes potentiallyaffecting Natura 2000 sites under the EU Birds and Habitats Directives. Theseassessments provide a structured process within which the flood risk assessmentcan sit. Important aspects of the processes are outlined in more detail inChapter 4.Planning Guidelines
Page 7: At the site-specific level, develop
Page 10 and 11: Planning Guidelines
Page 12 and 13: 2regard to the guidelines in the pe
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
Page 22 and 23: 122.21 In undertaking a flood risk
Page 24 and 25: 142.30 Increases in rainfall intens
Page 26 and 27: 16after periods of heavy rainfall.
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 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
Page 42 and 43: 32• Include zoning objectives to
Page 44 and 45: 34specific areas, ensuring that flo
Page 46 and 47: 36should use the flood risk informa
Page 48 and 49: 38planning authority to ensure that
Page 50 and 51: 40• these guidelines, and in part
Page 52 and 53: 425.22 Where development proposals
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
Page 76 and 77: 66Planning Guidelines• The impact
Page 78 and 79: 68An additional document on interpr
Page 80 and 81: 70Table A2: The Flood Risk Balance
Page 82 and 83: 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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