The Planning System and Flood Risk Management - Offaly County ...
The Planning System and Flood Risk Management - Offaly County ...
The Planning System and Flood Risk Management - Offaly County ...
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62A successful FRA is characterized by the iterative process of the assessmentof flood risk <strong>and</strong> impacts <strong>and</strong> then subsequent design of mitigation <strong>and</strong>compensation measures is shown in Figure A2.<strong>Planning</strong> GuidelinesFig. A2: Approach to <strong>Flood</strong> <strong>Risk</strong> Assessment (SFRA <strong>and</strong> FRA)<strong>Flood</strong>ing From Other Sources, Screening <strong>and</strong> Assessment<strong>Flood</strong>ing from other sources other than the coast <strong>and</strong> rivers, such as overl<strong>and</strong>flow are more difficult but essential to address <strong>and</strong> normally requireconsiderably more detailed approaches. <strong>The</strong> flooding of August 2008 includedmany instances of overl<strong>and</strong> flow in areas not historically known to flood.<strong>The</strong>re are a range of interactive mapping (GIS), topographical analysis <strong>and</strong>overl<strong>and</strong> routing techniques that can be used to assess <strong>and</strong> map flood riskfrom other sources to be harnessed in FRA. <strong>The</strong>se methods provides anindication of overl<strong>and</strong> flow routes <strong>and</strong> areas prone to surface water floodingthat are not identified by flood zone mapping. Initial screening may focus