Vulnerability of the Scottish Road Network to Flooding

Ferguson, Neil and Boura, Georgia and Gray, Ander and Patelli, Edoardo and Tubaldi, Enrico (2023) Vulnerability of the Scottish Road Network to Flooding. Scottish Road Research Board, Glasgow.

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Between 2014 and 2021 there were over 600 recorded flooding incidents per year on trunk roads managed by the four Operating Companies. Whilst many of these incidents were relatively minor in nature, around 9% of incidents resulted in a reduction in road width or at least one lane closure, and just over 1% led to a road or carriageway closure. Around half of all recorded flooding incidents had a duration of more than one hour, and 3.4% were longer than 6 hours. On average, there was at least one flooding incident on the trunk road network every two days. The maximum number of recorded incidents in a single day was 51, which occurred on 31st December 2015 during Storm Frank, and there were more than 15 flooding incidents in a single day on 40 occasions in the period 2014-2021.