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The Thames and Tweed: a tale of two HELP basins

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World Water Day
World Water Day

Tom Ball, UNESCO Centre for Water Law, Policy and Science at the University of Dundee, comparing Tweed HELP basin with that of the Thames and beyond. Presentation to World Water Day workshop on 22 March 2010.

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Tom Ball Associate Fellow: UNESCO centre for Water Law, Policy and Science, University of Dundee The Thames and Tweed: a Tale of Two UK HELP Basins
Acknowledgments ,[object Object],[object Object]
Structure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The Thames Basin ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Average annual rainfall 600-800 mm Geology Land use
The Tweed Basin ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Average annual rainfall - 700-1700 mm ,[object Object],[object Object],[object Object]
Hydrometry in the UK ,[object Object],[object Object],[object Object]
Data source: Met Office/Hadley Centre
High Flow Trends ,[object Object],[object Object],[object Object],[object Object],[object Object],High Flow Magnitude, 1970 - 2004 Hannaford, J. and Marsh, T.J. 2008. High-flow and flood trends in a network of undisturbed catchments in the UK. Int. J. Clim. 28, 1325-38
Scotland: increased incidence of floods last 30 years? ,[object Object],[object Object],[object Object]
[input dundee research on rivers] August 2008: Kirknewton, Tweed Catchment © Environment Agency
Are summers getting more arid? Yes, but how does this impact on water resources stress? T. Marsh, CEH Wallingford
Low flow trends ,[object Object],[object Object],[object Object],[object Object],30-day min 1973 - 2002 Hannaford, J. and Marsh, T.J. 2008. An assessment of trends in UK runoff and low flows using a network of undisturbed catchments in the UK. Int. J. Clim. 26, 1237-1253
Thames Basin: 1883-2009 water-yr max flows at Teddington 1894 1947 1974 T. Marsh, CEH Wallingford
Low flows in the Thames basin ,[object Object],[object Object],[object Object],Diversion of Luxborough effluent completed
Low flows at Teddington/Kingston ,[object Object],[object Object],[object Object],T. Marsh, CEH Wallingford
Naturalised low flows at Teddington/Kingston T. Marsh, CEH Wallingford
2003 Drought – ‘scenario compliant’ ,[object Object],[object Object],[object Object],[object Object],Water resources provision in the Thames basin is resilient to dry summers
2004-06 drought – ‘not scenario compliant’ ,[object Object],[object Object],[object Object],[object Object],[object Object],Water resources in the Thames basin are particularly vulnerable to clusters of dry winters T. Marsh, CEH Wallingford
Some conclusions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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The Thames and Tweed: a tale of two HELP basins

  • 1. Tom Ball Associate Fellow: UNESCO centre for Water Law, Policy and Science, University of Dundee The Thames and Tweed: a Tale of Two UK HELP Basins
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  • 7. Data source: Met Office/Hadley Centre
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  • 10. [input dundee research on rivers] August 2008: Kirknewton, Tweed Catchment © Environment Agency
  • 11. Are summers getting more arid? Yes, but how does this impact on water resources stress? T. Marsh, CEH Wallingford
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  • 13. Thames Basin: 1883-2009 water-yr max flows at Teddington 1894 1947 1974 T. Marsh, CEH Wallingford
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  • 16. Naturalised low flows at Teddington/Kingston T. Marsh, CEH Wallingford
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Editor's Notes

  1. Emphasise flow control and engineering works – influence on this trend.
  2. Sewage treatment work reform – Roding example. Importance of replacement of flow back into rivers – cf sewage effluent – impact of WQ measures – abstraction without replacement
  3. Naturalised low flow show correction for abstractions – much more uniform pictrure, and more in line with summer rainfall trends.
  4. Drought experience: in general, exceptional ability to manage drought episodes. Reservoir and aquifer recharge crucial
  5. BUT 2004- 06 drought showed effect of 2x dry winters in succession.
  6. Recent record contains few protracted droughts