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The challenge of keeping London supplied with water

The challenge of keeping London supplied with water. Piers Clark Commercial Director Thames Water. We are the UK’s largest water and sewerage company. 8.9 million water customers 14.3 million wastewater customers 19,400 miles of water mains 67,400 miles of sewer network.

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The challenge of keeping London supplied with water

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  1. The challenge of keeping London supplied with water Piers Clark Commercial Director Thames Water

  2. We are the UK’s largest water and sewerage company • 8.9 million water customers • 14.3 million wastewater customers • 19,400 miles of water mains • 67,400 miles of sewer network Biggest capital delivery programme in the industry, worth £5bn over five years

  3. Rainfall March 2010 – September 2012

  4. Thames Rainfall Deficit 2010-2012 Cumulative surpluses and deficiencies. Thames Area Average Annual rainfall is 739mm based on historical long term average.

  5. Level 4 Risks • Level 4 restrictions represent the point at which London’s reservoir storage has declined to its emergency reserve (equivalent to approximately 30 days storage) • Demand must be drastically reduced so that London does not run out of water • Level 4 has major customer, economic, reputational and regulatory consequences • The company must be able to demonstrate that it has done everything in its power to prevent reaching Level 4

  6. Forecast London reservoir storage to determine drought management measures

  7. Over Last 16 months Rainfall in the South East of England has been Notably low or Exceptionally Low.

  8. Cumulative rainfall for Jan to Jan 2011/2012 has been lower than 1975/76 and 2005/06

  9. Surface water (SW) flows – forecast at Teddington Weir Drought severity as a function of flow at Teddington (May-Aug) 1991-2011 with 4 driest years – 60% long term average rainfall

  10. Rainfall March 2010 – September 2012

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