{"id":212,"date":"2018-01-18T23:39:10","date_gmt":"2018-01-18T23:39:10","guid":{"rendered":"https:\/\/sites.dundee.ac.uk\/hydrology\/?p=212"},"modified":"2018-01-19T18:43:36","modified_gmt":"2018-01-19T18:43:36","slug":"remembering-the-great-tay-flood-of-january-1993","status":"publish","type":"post","link":"https:\/\/sites.dundee.ac.uk\/hydrology\/remembering-the-great-tay-flood-of-january-1993\/","title":{"rendered":"Remembering the Great Tay Flood of January 1993"},"content":{"rendered":"

25 years ago, on 17 January 1993, a peak river flow of 2268 m3\/s was recorded at Ballathie gauging station on the River Tay – the highest rate ever recorded in the UK.\u00a0 At the time, I had only just started work for the National River Flow Archive<\/a> at the NERC Institute of Hydrology.\u00a0 The flood left hundreds of people with devastated homes and many lasting impacts: the memory is perhaps best forgotten for many of them.\u00a0 For me, it was a key moment at the start of a hydrological career in Scotland, and\u00a0there’s been no lack of interesting projects to investigate since.<\/p>\n

Reflecting on the Great Tay Flood, it’s worth taking a moment to think about how much has changed since then.\u00a0 Many of these changes may be partly attributable to that fateful event in Perthshire: it changed how we thought about flood risk in Scotland at least.\u00a0 Here are some quick personal reflections:<\/p>\n

Climate change was much more of a contentious issue back then – could human agency really<\/em> be changing the climate?\u00a0 There was a sense that this was a flood (reckoned to be the biggest in almost 200 years) that shouldn’t<\/em> have happened: something must have gone wrong to cause such a disaster.\u00a0 Some looked to climate change as “the reason”.\u00a0 I remain uncomfortable with the idea of attributing a single large flood solely to climate change, but I think the vast majority of hydrologists would see it as being of critical importance to flood risk assessment in general.\u00a0 It’s one of the key hydrological challenges for the future.<\/p>\n

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Sodden house contents after the flood<\/figcaption><\/figure>\n

Flood forecasting and warning were in their infancy then.\u00a0 Certainly, the hydrologists of the day were using all the information at their disposal; it was clear to them that something very big was about to happen, and that information was shared with the authorities who needed the best information available.\u00a0 Telemetry monitoring systems, the science behind flood forecasting and the methods of issuing warning messages and preparing recipients\u00a0have been transformed in the years since – see the Scottish Flood Forecasting Service<\/a>. and Scottish Flood Forum<\/a>.\u00a0 I’m not sure if community resilience had entered many people’s vocabularies back then…?<\/p>\n

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Washed-out railway embankment at Dalguise in the Tay valley<\/figcaption><\/figure>\n

Perth got its flood defences, completed in 2001, at a cost of \u00a325 million – the most costly scheme in Scotland at the time.\u00a0 At 8km long, the design allowed for subsequent raising if the need were to arise: a recognition of the uncertainty of risk estimation and the possible effects of climate change.\u00a0 The\u00a0defences incorporated more than 80 gates, to address local needs for access, and relying for their operation on the growing capabilities of flood warning.\u00a0 The scheme provides structural protection for many hundreds of homes and businesses, and a good deal of peace of mind for those at risk.<\/p>\n

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Perth flood defences under construction, Tay Street<\/figcaption><\/figure>\n

It’s worth thinking about the role played by the flood marks on Smeaton’s Bridge<\/a>.\u00a0 The marks showed that 1993 was the highest flood since the bridge was built in the 1770s – excluding the 1814 ‘ice jam’ flood<\/a>.\u00a0 And that was an outlier – we don’t get ice jam floods any more: nobody was arguing that we should allow for that scenario in future.\u00a0 So the historic record provided a context for the flood: it gave some certainty that this flood really was something unprecedented.<\/p>\n

Also since 1993, legislation has seen the responsibilities for flood risk management overhauled, most recently in the 2009 Flood Risk Management (Scotland) Act, with the roles of local authorities and SEPA (formed in 1996) in particular\u00a0clarified, extended and better coordinated.<\/p>\n

What else has changed or happened?\u00a0Scottish devolution, the economic downturn of 2008, ubiquitous smartphones!\u00a0 These are just a few thoughts as we pass this anniversary.\u00a0 Maybe you’d like to share your thoughts?<\/p>\n