Appendix 4 - Alyth NFM - Short List of Potential Options Summary Table
Perth and Kinross Council · 23 October 2024
Back to Climate Change and Sustainability Committee — 23 October 2024 and its agenda
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Appendix 4 Alyth Natural Flood Management Study (NFM) – Short List of Potential Options Optio n ID Description Total Benefit (present value) Estimated Capital Cost Standard of Protection (SoP) No. of properties protected to the measure SOP Benefit- Cost Ratio A Johnshill Burn culvert upgrades £837,381 £647,064 0.5% AEP 10* 1.19 B Alyth Burn flood walls and Johnshill Burn culvert upgrade £3,644,226 £5,855,524 0.5% AEP 106 0.61 C Alyth Burn weir removal, Johnshill Burn culvert upgrades and flood wall £3,407,015 £6,888,605 1% AEP 67 0.49 D Doctor's Burn channel upgrades £2,040,776 £800,161 1% AEP 40 2.25 E Catchment wide NFM (excluding loch upsizing) £412,827 £1,114,301 n/a 0 0.18 *However, there is still a residual risk of flooding from the Alyth Burn.