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Technical Paper: Swept away

A historic bridge was one of the casualties of debris flows following abnormally heavy rain in eastern Scotland two years ago. Daryl Fossett, Maddie Clarke and Marion Duff explain how the damage was dealt with. This paper was first published in GE’s September 2006 issue.

In early August 2004, abnormally heavy rainfall swamped Perth & Kinross and the east of Scotland. By the evening of 11 August, some of the ground could take no more, triggering slips that continued into the following morning.

Several trunk roads were closed by debris slides, as was the C502, a minor road between Dunkeld to Rotmell. It had been part of the A9 until improvements in the 1970s introduced a bypass to Dunkeld; it was then retained as a local access and diversion route for the new A9 that runs parallel below it.

Damage to the C502 centred on two culverts, and an 18th century stone and lime mortar toll bridge was partially destroyed.

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