Whalley & Billington – FLood Action Group

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The floods of December 2015 in northern England – published in Hydrology Research

Summary

The report is focussed more on Cumbria than Lancashire -see the follow up questions at the end.  However the  tables in the report do demonstrate just how unusual the events of boxing day 2015 in Whalley both in the build up (rainfall in November / December) and on the day.

Headlines

[Taken from the report]

  • 17,500 flooded properties

  • Affected much of northern England

  • Some locations were flooded more than once

  • Record 24, 36, 48 hour UK rainfalls

  • New highest recorded flows in England (~1,700m3/s) on Eden, Lune, Tyne

  • Highest-ever recorded flows at many river gauging stations

  • Some locations had their highest floods in the historical record

Abstract

[With thanks to Hydrology Research]

In December 2015, northern England experienced two major flooding events with extreme, even in some locations unprecedented, rainfalls and flooding. New 24-, 36-, and 48-hour UK rainfall records were created of 341.4, 401.4, and 405.2 mm, respectively. Three river-flow gauging stations, with flows of around 1,700 m3/s exceeded the previous peak flow record for England and Wales. There was widespread flooding, including major towns and cities, some of which had recent flood alleviation schemes. In Cumbria, the flood events in 2005, 2009 and 2015 compared with previous and historical events raise questions about the stationarity of the flood data and flood-producing mechanisms. These possible effects are less apparent elsewhere in northern England. This paper discusses whether present methods of estimating flood risk are able to cope with such extreme events and suggests topics for future research. In the meantime, for studies where flood estimates are important, practical hydrologists are faced with the difficult task of producing design flood estimates which fit with our understanding of these events.

 

For full report click here Dec 2015 Floding in the North of England hydrology report Peter_Spencer_v1

Table taken from the above report.  Of the rivers mentioned the Calder had the second highest flow rate.

table from hydrology reporton Dec 2015 floods

 

 

 


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Visit to Hydrotec – April 26th, 2018

20180426_191158-001

Just over 20 of us were welcomed by the team at Hydtrotec.

Chris Thornton (far right) gave a 30 minute presentation on the physical model.  This including the information sources for building the model, a time lapse video of the actual build, the calibration and validation procedure, the results and ideas so far.

Then Chris and James Green (another Hydrotec engineer) answered questions for about 45 minutes.  At the session I attended everyone attending seemed happy with the project and that their concerns had been addressed. Feedback after the event has also been positive.

Andrew Ronnan suggested making a summary presentation of the project to an open meeting in the village when the project is over.  Hydrotec will be happy to supply the video’s which give a great understanding of how the model works.  Video’s will also help us understand the final recommendations from Hydrotec.

Next step

We will publicise the results coming out of Hydrotec’s final report.