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

The water and waste water companies of England and Wales

The Wessex Water region

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

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

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

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

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

Customer priorities

A new direction 7% reduction in real terms

The business plan Our nine outcomes

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

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

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

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

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

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

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

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

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!

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

Data sources

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)

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

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

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

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

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

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

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

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

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

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

Querying individual instruments Data analysis Querying individual instruments

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…

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

Data analysis Improved data integrity with audit trail

Data analysis Improved MNF calculations – pumped flows

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

Supporting leakage functions Pressure management Hydraulic modelling Smart analytics

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

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

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

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

Correlated with leakage results Pressure management AZNP Study - 2012 Wessex Water AZNP Average = 43m 20 DMAs > 70m 54 DMAs > 60m Wessex Water AZP 41.5m Correlated with leakage results

Pressure management

Break for coffee/tea

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

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

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

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

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

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

Leakage targeting

Active leakage control

Active leakage control Customer App

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

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

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

Leakage job cards

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

Seasonal variations

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

Seasonal variations

Questions & Discussion