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

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50TermsDefinitionPlanning GuidelinesOvertopping of defencesPathwaysPluvial floodingPrecautionary approachRiver basin managementplanRegional PlanningGuidelines (RPG)Failure of a flood defence or exceedancemechanism, when flood water reaches levelsthat are higher than the flood defence level andflows over the top of the structure. While thestructure may remain stable, however, erosion ofthe landward face of the defence could cause thedefence to collapse.These provide the connection between aparticular source (e.g. high river or tide level)and the receptor that may be harmed (e.g.property). In flood risk management, pathwaysare often ‘blocked’ by barriers, such as flooddefence structures, or otherwise modified toreduce the incidence of flooding.Usually associated with convective summerthunderstorms or high intensity rainfall cellswithin longer duration events, pluvial floodingis a result of rainfall-generated overland flowswhich arise before run-off enters anywatercourse or sewer. The intensity of rainfallcan be such that the run-off totally overwhelmssurface water and underground drainagesystems.The approach to be used in the assessment offlood risk which requires that lack of fullscientific certainty, shall not be used to assumeflood hazard or risk does not exist, or as areason for postponing cost-effective measures toavoid or manage flood risk.As required by the EU Water FrameworkDirective (2000/60/EC), these plans willestablish a strategic plan for the long-termmanagement of the River Basin District, set outobjectives for waterbodies, and in broad termsidentify what measures are planned to meetthese objectives, and act as the main reportingmechanism to the European Commission.These provide the regional context and prioritiesfor applying national planning strategy to eachNUTS III region and encourage greater coordinationof planning policies at the city /county level. RPGs are an important part of theflood policy hierarchy as they can assist in coordinatingflood risk management policies at theregional level.
TermsDefinition51ResilienceResistanceReceptorsResidual riskRun-offSequential approachScoping flood riskassessmentScreening flood riskassessmentSourceSometimes known as “wet-proofing”, resiliencerelates to how a building is constructed in sucha way that, although flood water may enter thebuilding, its impact is minimised, structuralintegrity is maintained, and repair, drying &cleaning and subsequent re-occupation arefacilitated.Sometimes known as “dry-proofing”, thisrelates to how a building is constructed toprevent flood water entering the building ordamaging its fabric.Things that may be harmed by flooding (e.g.people, houses, buildings or the environment).The risk which remains after all risk avoidance,substitution and mitigation measures have beenimplemented, on the basis that such measurescan only reduce risk, not eliminate it.The flow of water, caused by rainfall, from anarea which depends on how permeable the landsurface is. Run-off is greatest fromimpermeable areas such as roofs, roads andhard standings and less from vegetated areas –moors, agricultural and forestry land.The sequential approach is a risk-based methodto guide development away from areas thathave been identified through a flood riskassessment as being at risk from flooding.Sequential approaches are already establishedand working effectively in the plan-making anddevelopment management processes.A generally qualitative or semi-quantitativeassessment to confirm sources of flooding thatmay affect a plan area or proposed developmentsite, to appraise the adequacy of existinginformation and to provide a qualitativeappraisal of the risk of flooding and potentialimpact of a development on flooding elsewhereand of the scope of possible mitigationmeasures.A broad-brush assessment to identify whetherthere are any flooding or surface watermanagement issues related to a plan area orproposed or existing development site that maywarrant further investigation.Source refers to a source of hazard (e.g. the sea,heavy rainfall).Planning Guidelines
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At the site-specific level, develop
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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 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
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
Page 84 and 85: 74Figure B2 below illustrates how t
Page 86 and 87: 76drainage processes and removing p
Page 88 and 89: 78• Signing of floodplain areas s
Page 90 and 91: 80flood level. Care must be taken t
Page 92 and 93: 82Appendix C - Frequently AskedQues
Page 94 and 95: 84What does the SFRA not provide?Th
Page 96 and 97: 86pressure in the embankment and ge
Page 98: Printed on recycled paper containin
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