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

• Change in number of properties at risk in 1% and 0.1% event before andafter. Assumes mitigation measures put in place – From an economicviewpoint development can replace existing property with lowervulnerability land uses and also development that is designed to beflood-resistant or resilient. A reduction in economic risk can be achieved;69• Scale and nature of flood risks – The residual risk maps should indicatelikely depths and flow routes. From running the surface water screeningassessment the scale and extent of the surface water flood risks can alsobe considered;• Impact of mitigation measure on other areas downstream and adjacent– How wide-ranging does the impact assessment need to be to takeaccount of the effects of significant land raising or alteration or blockageof flow routes.Planning authorities should use these indicators to qualitatively assess eachkey type of vulnerable land use proposed in each of the policy areas beingconsidered by the SFRA. Each of the indicators should be scored accordingto the system outlined in the table below to produce a Flood Risk BalanceSheet. The results should be assessed to produce one of five possible outcomeson the acceptability of a particular type of development within a policy area.The five potential outcomes are:• Counter to strategic approach, flood risk unacceptable. It would bedifficult to meet the criteria of the Justification Test. Not recommended;• Sequentially not preferred but a limited range of land uses might bepossible;• Sequentially not preferred but a wider range of land uses could bebrought forward after careful consideration and subject to an appropriatesite-specific FRA;• Acceptable with some detailed consideration of flood-risk issues to beresolved by an appropriate site-specific FRA; and• Acceptable subject to a satisfactory appropriate site-specific FRA.Planning Guidelines