What Drought Means for a Water Company
Richard Bienfait Managing Director, Veolia Water Central
13th June 2012 Veolia Water Central Ltd Responsibility and risk We have a legal responsibility to supply wholesome drinking water 24/7 Weather plans are becoming more varied and less predictable Droughts are unique Key issues add to risks and uncertainty We have a plan for managing droughts We must maintain our legal responsibilities even in a drought
Veolia Water Central Ltd 2 Our business operates in three areas in south east England
Regulated water industry in England and Wales Veolia Water Central VW Regulated WoC area Largest WoC in England and Wales by Other WoC area revenues Water and Sewerage Company (WaSC) area Supplies a population of c.3.2m
Typical daily supply - 850 Ml/d Northumbrian 0
United Veolia Water East Utilities Yorkshire Cambridge Supplies a population of c.160,000 Typical daily supply - 29 Ml/d
Dee Valley
South Staffordshire Anglian Severn Trent Northumbrian
Dwr Cymru (Welsh) Thames Veolia Water Southeast Northumbrian Bristol London Supplies a population of c.160,000 Cholderton & District Southern Wessex Typical daily supply - 43Ml/d South West Sutton & Bournemouth & East Surrey West Hampshire South East Portsmouth
Veolia Water Central Ltd 3 The sources of our water supply
Grafham (3%) (not to scale)
Veolia Water Central • 60% ground water sources - 248 boreholes • 40% surface water sources - 4 River Thames abstraction points - Grafham reservoir import Sunnymeads (20%)
Egham (10%) Walton (3%) Chertsey (4%)
Veolia Water Central Ltd 4 Drought Management Plans Our drought Management Plan sets out how we deal with droughts Our stated level of service is 1 in 10 years Plans are updated annually and subject to public consultation every three years Latest plan awaiting Defra approval
Veolia Water Central Ltd 5 Groundwater drought triggers
Groundwater Drought Triggers 100
99
98
97
96
95
94 Water Level (mAOD)
93
92
91 Autumn/Winter Spring Summer
90
Jul-10 Jul-11 Jul-12
Apr-10 Apr-11 Apr-12
Oct-10 Oct-11 Oct-12
Jan-10 Jan-10 Jun-10 Jan-11 Jun-11 Jan-12 Jun-12
Mar-10 Feb-11 Mar-11 Feb-12 Mar-12
Aug-10 Sep-10 Aug-11 Sep-11 Aug-12 Sep-12
Nov-10 Dec-10 Nov-11 Dec-11 Nov-12 Dec-12
May-10 May-11 May-12
Average Drought Zone 1 Drought Zone 2 Drought Zone 3 Drought Zone 4
Veolia Water Central Ltd 6 Long term average rainfall and SMD LTA rainfall and SMD
140 120.00 autumn / winter spring / summer 120 100.00
100 80.00
80
60.00
60 Rainfall(mm)
40.00 40 (mm) Deficit Moisture Soil
20.00 20
0 0.00 Sep- Oct- Nov- Dec- Jan- Feb- Mar- Apr- May- Jun- Jul- Aug- Sep- Oct- Nov- Dec- Jan- Feb- Mar- Apr- May- 10 10 10 10 11 11 11 11 11 11 11 11 11 11 11 11 12 12 12 12 12
LTA Rainfall LTA SMD
Veolia Water Central Ltd 7 Rainfall and Recharge compared to LTA
Rainfall, Recharge and SMD compared to LTA
Sep-10 Oct-10 Nov-10 Dec-10 Jan-11 Feb-11 Mar-11 Apr-11 May-11 Jun-11 Jul-11 Aug-11 Sep-11 Oct-11 Nov-11 Dec-11 Jan-12 Feb-12 Mar-12 80 80
60 60
40 40
20 20
0 0 Soil Moisture Deficit (mm) Deficit Moisture Soil
Effective Precipitation (mm) Precipitation Effective -20 -20
-40 -40 Deficit Rainfall 153mm (64%) Deficit Rainfall 139mm (67%) -60 -60 Deficit Recharge 47mm (76%) Deficit Recharge 145mm (25%)
Rainfall of LTA Recharge of LTA SMD
Veolia Water Central Ltd 8 Drought Trigger Predictions March 2012
Groundwater Drought Triggers 100
99
98
97
96
95
94 Water Level (mAOD)
93
92
91
90
Jul-10 Jul-11 Jul-12
Apr-10 Apr-11 Apr-12
Oct-10 Oct-11 Oct-12
Jan-10 Jan-10 Jun-10 Jan-11 Jun-11 Jan-12 Jun-12
Mar-10 Feb-11 Mar-11 Feb-12 Mar-12
Aug-10 Sep-10 Aug-11 Sep-11 Aug-12 Sep-12
Nov-10 Dec-10 Nov-11 Dec-11 Nov-12 Dec-12
May-10 May-11 May-12
Average Drought Zone 1 Drought Zone 2 Measured
Drought Zone 3 Drought Zone 4 Predicted Level 60%
Veolia Water Central Ltd 9 April Rainfall
Veolia Water Central Ltd 10 Drought Trigger Predictions May Groundwater Drought Triggers 100
99
98
97
96
95
94 Water Level (mAOD)
93
92
91
90
Jul-10 Jul-11 Jul-12
Apr-10 Apr-11 Apr-12
Oct-10 Oct-11 Oct-12
Jan-10 Jan-10 Jun-10 Jan-11 Jun-11 Jan-12 Jun-12
Mar-10 Feb-11 Mar-11 Feb-12 Mar-12
Aug-10 Sep-10 Aug-11 Sep-11 Aug-12 Sep-12
Nov-10 Dec-10 Nov-11 Dec-11 Nov-12 Dec-12
May-10 May-11 May-12
Average Drought Zone 1 Drought Zone 2 Measured Drought Zone 3 Drought Zone 4 Predicted Level 100% rainfall Predicted Level 80% rainfall Predicted Level 60% rainfall
Veolia Water Central Ltd 11 Current Activities Following our Drought Management Plan Introduced Temporary Use Ban from 5 April Radio, press and communications with key stakeholders Managing over a 5% increase in calls from our customers relating to the drought Abstracting more surface water and importing more water from Grafham Driven down leakage, now 15% below Ofwat target Increased promotion of water efficiency Now producing 100Ml/d less than last year and less than 70Ml/d (9%) than a typical year
Veolia Water Central Ltd 12 Demand 2012
Weekends Hosepipe Ban Imposed Daily Demand Profile Daily Demand Jan 2012 - 1st June 2012 Daily Rainfall (Bishops Rise Tipping Gauage) (mm) Average Daily Temp (°C) 1000 -5 -3 -1 1 950 3 5 7 900 9 11 13 15 850
mega litres per day per litres mega 17 19 21 800 23 25 27 29
750
01 Apr 01 Apr 03 Apr 05 Apr 07 Apr 09 Apr 11 Apr 13 Apr 15 Apr 17 Apr 19 Apr 21 Apr 23 Apr 25 Apr 27 Apr 29
01 Feb 01 Feb 03 Feb 05 Feb 07 Feb 09 Feb 11 Feb 13 Feb 15 Feb 17 Feb 19 Feb 21 Feb 23 Feb 25 Feb 27 Feb 29
02 Mar 02 Mar 04 Mar 06 Mar 08 Mar 10 Mar 12 Mar 14 Mar 16 Mar 18 Mar 20 Mar 22 Mar 24 Mar 26 Mar 28 Mar 30
01 May 01 May 03 May 05 May 07 May 09 May 11 May 13 May 15 May 17 May 19 May 21 May 23 May 25 May 27 May 29 May 31
Veolia Water Central Ltd 13 Demand 2012 v 2011
Weekends Hosepipe Ban Imposed Daily Demand Profile Jan 2012 - 1st May 2012 Daily Demand 2011 Daily Demand 2012 1000 -5 -3 -1 1 950 3 5 7 900 9 11 13 15 850
mega litres per day per litres mega 17 19 21 800 23 25 27 29
750
01 Apr 01 Apr 03 Apr 05 Apr 07 Apr 09 Apr 11 Apr 13 Apr 15 Apr 17 Apr 19 Apr 21 Apr 23 Apr 25 Apr 27 Apr 29
01 Feb 01 Feb 03 Feb 05 Feb 07 Feb 09 Feb 11 Feb 13 Feb 15 Feb 17 Feb 19 Feb 21 Feb 23 Feb 25 Feb 27 Feb 29
02 Mar 02 Mar 04 Mar 06 Mar 08 Mar 10 Mar 12 Mar 14 Mar 16 Mar 18 Mar 20 Mar 22 Mar 24 Mar 26 Mar 28 Mar 30
01 May 01 May 03 May 05 May 07 May 09 May 11 May 13 May 15 May 17 May 19 May 21 May 23 May 25 May 27 May 29 May 31
Veolia Water Central Ltd 14 Planning for 2013 and beyond Focus is on a third dry winter Reviewing source outputs under very low water level conditions Looking at innovative sources of water Undertaking network modelling Future concerns with pollution of sources and sustainability reductions
Veolia Water Central Ltd 15 Conclusions Droughts pose a significant impact on water companies, their customers and the environment We still have a legal responsibility to supply to customers Different water companies will have different responses which are linked to their water resource availability Droughts are planned for as part of routine business, but are exceptional events that vary in their level of severity Uncertainty in water availability is managed through a structured analysis of historic source performance and the hydrogeological environment of the source Planned demand restrictions are imposed on customers are to ensure there is an adequate supply of water for essential purposes
Veolia Water Central Ltd 16 Beane Road, Hertford Aug 1998
Thank you Any questions?
Veolia Water Central Ltd 17