Appendix 3 - Alyth NFM - Plans of Short Listed Potential Options
Perth and Kinross Council · 23 October 2024
Back to Climate Change and Sustainability Committee — 23 October 2024 and its agenda
Text extracted from the council's PDF. Layout and reading order may differ from the original.
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Appendix 3 Alyth Natural Flood Management Study (NFM) – Plans of Potential Options Option A Johnshill Burn culvert upgrades This option involves the replacement of the existing culvert to accommodate 1 in 200 year flood flow (the flood event with a 0.5% chance of occurring in any given year/also known as AEP) and will reduce the risk of flooding to 10 properties from the Johnshill Burn. Flood risk from Alyth Burn will remain. Figure 1 – Culvert upgrade on the Johnshill Burn (Option A)
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Option B Alyth Burn flood walls and Johnshill Burn culvert upgrade This option provides a 1 in 200 year (0.5% AEP) standard of protection by constructing flood walls on both banks of the burn around the centre of Alyth and upgrading Johnshill Burn. Figure 2 - Alyth Burn flood walls (0.5% AEP SOP) and Johnshill Burn culvert upgrade (Option B)
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Option C Alyth Burn weir removal, Johnshill Burn culvert upgrade and flood wall This option provides a 1 in 100-year (1% AEP) standard of protection and involves removing the weirs within Alyth, in combination with Johnshill culvert upgrades and flood walls. Figure 3 - Alyth Burn weir removal, Johnshill Burn culvert upgrade and flood wall (1% AEP SoP) (Option C)
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Option D Doctor’s Burn channel upgrades The option provides a 1 in 100-year (1% AEP) Standard of Protection by upgrading and raising flood embankments, creation of a flood storage area and upgrading a culvert. This option reduces flood risk to 40 properties. Figure 4 - Improved existing flood embankments, culvert upgrade and flood storage area on the Doctor’s Burn (Option D)
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Option E Catchment wide NFM (excluding loch upsizing) This option considered the implementation of a wide range of NFM measures across the catchment of the Alyth Burn as illustrated in Figures 7 to 11. Figure 5 - NFM options in the northern portion of study area (Option E)
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Figure 6 - NFM options in the central portion of the study area (Option E) Figure 7 - NFM options in the southern portion of the study area (Option E)