2. Overview UK Water companies Wessex Water Water supply Waste water
Regulation
Business Planning
Performance commitments
Leakage PC’s
Leakage strategy
Data
Pressure management
Targeting
Active leakage control
Seasonality

3. The water and waste water companies of England and Wales

4. The Wessex Water region

5. Highest standards of service and quality in UK
The company
One of the 10 regional water and sewerage businesses in England and Wales
One of the most efficient water and sewerage companies according to the industry regulator Ofwat
Highest standards of service and quality in UK
Since privatisation in 1989 we have invested more than £3.6bn in improving and maintaining water and sewerage services
Consistently the most profitable water and sewerage company

6. Approximately 330Ml/d of water produced per day 96 water sources
Water supply
Approximately 330Ml/d of water produced per day
96 water sources
75% groundwater and 25% surface water
110 treatment plants

7. 11,650km of water mains in the supply network 1,500km – Trunk mains
Water supply
11,650km of water mains in the supply network
1,500km – Trunk mains
10,150km – Distribution mains
340 service reservoirs and water towers
209 booster pumping stations
600,000 Connections
1.3 million customers

8. 1,003 combined sewer overflows All will be monitored by 2020
Wastewater
35,000km of public sewer
1,600 pumping stations
1,003 combined sewer overflows
All will be monitored by 2020
2.7 million customers
407 sewage treatment works
460Ml/d treated per day

9. Economic regulator - UK Gov Regulates bills & measures performance
Regulation
Ofwat
Economic regulator - UK Gov
Regulates bills & measures performance
Service incentive mechanism
Performance commitments
DWI – Water quality regulator – UK Gov
EA – Environmental regulator – UK Gov

10. Customer priorities

11. A new direction
7% reduction in real terms

12. The business plan
Our nine outcomes

13. Our performance commitments
12 apply to Wholesale water supply
6 Penalty only
4 Penalty & reward
2 Reputational only
Reduced leakage – 2 PCs
Highest quality drinking water – 2 PCs
Rivers, lakes and estuaries protected – 5 PCs
Resilient services – 3 PCs
+ Affordable bills – 2 PCs allocated to retail
Per capita consumption & water efficiency

14. Annual leakage figure 69Ml/d 21% of distribution input 16% networks
Reduced leakage
Annual leakage figure 69Ml/d
21% of distribution input
16% networks
7% customer

15. Current leakage expenditure Circa. £13.5M/year Active leakage control
Reduced leakage
Current leakage expenditure
Circa. £13.5M/year
Active leakage control
Repair & maintenance
Pressure management
Special projects

16. Volume of water leaked Reduced Leakage
Challenging target – 5% reduction
Out performance not cost beneficial due to limited rewards
HIGH BUSINESS RISK, DUE TO CHALLENGING TARGET AND ONGOING REPUTATIONAL IMPACT

17. Reported leaks fixed within a day Challenging target
Reduced Leakage
Reported leaks fixed
within a day
Challenging target
New reporting mechanism being developed as number of exclusions apply to data reported externally
Retail driven customer perception target that places cost and inefficiencies on wholesale business
LOW BUSINESS RISK

18. Future leakage target
71Ml/d
66.5Ml/d
52.5Ml/d

19. Leakage strategy How will we deliver the 5%? Customer metering
Circa 55% of customers metered
All non-domestic metered
Domestic metering optional
Water resource surplus
Proposed strategy
Increased positive publicity
In the right situation a meter saves money
Metering on change of occupier

20. Leakage strategy How will we deliver the 5%? Metering
More trunk main meters
More meter calibration
Pressure management
More pressure controllers
Redesign pressure managed areas
Asset renewal
More mains replacement
More service pipe replacement

21. Leakage strategy How will we deliver the 5%... Then 25% by 2040?
Innovation
Beyond 2020 project
75 ideas/concepts
Refined to 35 for cost benefit analysis
Quick wins for 2020 target
Better use of data!

22. Wessex Water Region 650 960 Data structure
Water in to supply zones (WIS) 33
District Metered Areas (DMAs)
650
Pressure managed areas (PMAs)
960

23. Data sources

24. 820 (5min polling – 15min archive) Manual download
Data collection
Flow measurement
GSM/GPRS loggers
1300 (15min store – 24hr send)
200 (15min store – 15min send)
Hardwired telemetry
820 (5min polling – 15min archive)
Manual download
700 (Monthly download)

25. 165 (5min polling – 15min archive) Reservoir level
Data collection
Pressure measurement
GSM/GPRS loggers
350 (15min store – 24hr send)
270 (15min store – 15min send)
Hardwired telemetry
165 (5min polling – 15min archive)
Reservoir level
324 (5min polling – 15min archive)
Manual collection
Numerous

26. Logger Maintenance Small team, increasing demands
Leakage, Networks, Commercial…
Annual Expenditure
£250k
Maintain data visibility and integrity
Monitor DMA ‘operability’

27. Servelec technologies ScopeX Control room tool 24hr, 365 days a year
Data visualisation
Telemetry
Servelec technologies ScopeX
Control room tool
24hr, 365 days a year
100’s of business users
Includes alarm management

28. Telemetry Threshold alarms High/low flow High/low pressure
Data analysis
Telemetry
Threshold alarms
High/low flow
High/low pressure
High/low level

29. Data analysis – Weymouth Trial
High flow and low pressure alarm received 1 hour before first customer contact 29

30. Data analysis – Weymouth Trial
Burst occurred at 02:30
Alarms received at 02:41
First customer contacted us at 03:41
High flow alarm level 1.6Ml/d
Low pressure alarm level 12m 30

31. Data analysis – Weymouth Trial
High flow alarm – 00:50
based on historic values 31

32. Data analysis – Weymouth Trial
01:00
Local Inspectors en-route to the area in alarm
Monitoring showed no affect on customer supplies
01:50
Inspectors arrive and locate issue
A council contractor filling an 18m3 tanker with a 2″ standpipe
Inspector stops contractor and closes hydrant
Contractor rather shocked at being caught
No customers affected
Potential for water quality issues due to increase in flow
Council informed
Contractor reprimanded 32

33. WRIMs – Water Resources Information Management System
Data visualisation
WRIMs – Water Resources Information Management System
Developed by Wessex Water
100’s of users
Bespoke leakage tool
Monitoring flow
Monitoring pressure
MNF Calculation
Long term trending

34. Daily flow (and pressure) alarm report
Data analysis
Daily flow (and pressure) alarm report

35. Querying individual instruments
Data analysis
Querying individual instruments

36. Implementation started 2011/12 System build
Data visualisation
WaterNet
Developed by RPS
Implementation started 2011/12
System build
Bottom up leakage calculation
Still growing and developing
2012/13 NRR & policy minimum study
2013/14 Meter audit & small area monitor scope
More leakage functionality in development…

37. Data analysis
Allowances (l/p/hr) – bottom-up leakage calc

38. Data analysis
Improved data integrity with audit trail

39. Data analysis
Improved MNF calculations – pumped flows

40. Data analysis More sophisticated flow balancing, inc. res overflows
Established trunk main balance area

41. Supporting leakage functions
Pressure management
Hydraulic modelling
Smart analytics

42. Pressure management
Assets operated
1692 PRV’s
1491 sites
201 Standby

43. PRV control 1286 Fixed outlet 20 Two stage 185 Full control
Pressure management
PRV control
1286 Fixed outlet
20 Two stage
185 Full control

44. 110 Service Reservoir inlet controls
Pressure management
Assets operated
110 Service Reservoir inlet controls

45. Risk based on population and differential head Minor, minor, major
Pressure management
Maintenance strategy
Service schedule
Risk based on population and differential head
Minor, minor, major
1920 services/year
160/month
Annual budget ~£200k
Compliance
Reduced bursts
PRV failings

46. Correlated with leakage results
Pressure management
AZNP Study
Wessex Water AZNP
Average = 43m
20 DMAs > 70m
54 DMAs > 60m
Wessex Water AZP
41.5m
Correlated with leakage results

47. Pressure management

48. Break for coffee/tea

49. The team! 2 x leakage engineers 3 x area managers
Leakage targeting
The team!
2 x leakage engineers
3 x area managers
39 x leakage inspectors

50. Daily flow (and pressure) alarm report Reactive Manual interpretation
Leakage targeting
WRIMs
Daily flow (and pressure) alarm report
Reactive
Manual interpretation
Manual prioritisation
Old technology
Visualises flows not leakage

51. Improves leakage targeting Policy minimum leakage
WaterNet
Improves leakage targeting
Policy minimum leakage
Enables ranking of zones
Better prioritisation

52. + local network knowledge
Leakage targeting
Analysis ‘model’
Efficient targeting =
Min. hours detection
m3 volume over target
+ local network knowledge

53. Smarter approach required Moving towards proactive model
Leakage targeting
Still mostly reactive
No longer sustainable
Smarter approach required
Moving towards proactive model
Requires greater analysis resource
Better software solutions
Trial into predictive analytics

54. Artificial neural networks, fuzzy logic etc…
Leakage targeting
Predictive
Artificial neural networks, fuzzy logic etc…
Currently commercial providers limited

55. Leakage targeting

56. Active leakage control

57. Active leakage control
Customer App

58. Active leakage control
Methodologies
Listening stick
Daily use
Better results at night
Ground microphone
Correlation
Material and fitting dependant

59. Active leakage control
Methodologies
Step testing
Night work only
2 per week in each area
Refines detection resource
Acoustic logging
Lift & shift
80 units for regional use
Multi point acoustic correlation
Permanent network monitoring

60. Active leakage control
Performance
650 DMAs
200 above policy minimum
Leakage job cards
R&M target 400 in progress
10% Mains leaks
Remainder…
Service pipes
Comms pipes
Ferrules
Valves etc

61. Leakage job cards

62. Summer demand masking leaks Summer breakout Difficult to detect
Seasonal variations
Summer demand masking leaks
Summer breakout
Difficult to detect
Expected drops in demand didn’t occur
Occurred 2 years in a row
Makes meeting the regulatory deadline challenging

63. Seasonal variations

64. New meter installation Domestic areas Help understand night use
Seasonal variations
Small area monitoring
WaterNet solution
1 second logging
Between 01:00 and 06:00
70 sites
New meter installation
Domestic areas
10 – 25 properties
Help understand night use
Flag when DMA’s are outside tolerance

65. Seasonal variations

66. Questions & Discussion