The challenge of keeping London supplied with water

Piers Clark Commercial DirectorThames Water

RiverCherwell

Banbury

Swindon

Oxford

Reading

Slough

HighWycombe

Guildford

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

Rainfall March 2010 – September 2012

Thames Rainfall Deficit 2010-2012

Thames Area Rainfall Deficit 2010 to 2012(Cumulative surpluses & deficicencies carried forward month by month.

Thames Area Annual Rainfall is 739mm, based on Historical Long Term Average)

-34-49 -57

-119-107 -107

-195-215

-201 -209 -204-227

-307 -303-328

Cumulative surpluses and deficiencies. Thames Area Average Annual rainfall is 739mm based on historical long term average.

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

Forecast London reservoir storage to determine drought management measures

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

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

Cumulative monthly rainfall data for 1975 to 1976, 2005 to 2006 and 2011 to Jan 2012 with Long Term Average (LTA) Rainfall since 1883

Jan Mar May Jul Sep Nov Jan Mar May Jul Sep Nov

LTA 1975-76 2005-06 2011-12

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

12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42

Mean natural daily flow Thames at Teddington (m 3/s)

4 driest years 1991-2011 London Predictive Flows 01/02/2012 - 60% of Long Term Average Rainfall

Drought Severity

2012 Predicted

19441976

20092006

19921995

199719211934 2011

Rainfall March 2010 – September 2012

The challenge of keeping London supplied with water

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