Are you AMP7 ready?Reducing Supply Interruptions

through innovationChris Muscat – Wessex Water Services

Richard Barnes - HydroCo

Targets and challenges….

• AMP7 Interruptions target of 3 minutes by 2025• Need to change our approach and culture

o On the groundo In the control room

• Improve our ‘systems & tools’o Develop more integrated systemso Improve our data ‘structure’ – join things up!o Move to a ‘Single View’ concept for network data

• Gather more data in ‘real-time’o Make sure we turn it into ‘Information’ and use it

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Some additional investment…

• On the groundoTanker infusionoLine stopsoSteadily changing the culture for both Planned and unplanned events

• In the control roomo Improve our coverage of ‘real-time’ network data with additional loggersoSet up our Network Response Co-Ordinator team (NRC) to manage

interruptions and put modelling in our control room 24/7

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So where should we put the loggers?

• Some said……. o ‘The highest point, surely’

oNo….the lowest-point set with the right alarm so we can track the loss of pressure and the recharge!

oRubbish…put them in the middle, the you get the best of both worlds

• Before things got too animated we decided to ask Hydroco to help….

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Where & Why do we currently log pressures?

Pressure Management Optimisation

DG2 Reporting

LeakageAnalysis

Network Modelling

• No LIVE data• No additional IT or communications infrastructure• Relatively cheap – easy to install

Understanding the project drivers….

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Tue Wed Thu Fri

Timeline Incident ALARM 1 ALARM 2Off 

SupplyLow 

PressureNormal Pressure

16:00 ‐ ‐ ‐ ‐ ‐ 100016:15 ‐ ‐ ‐ ‐ ‐ 100016:30 YES YES ‐ ‐ 500 50016:45 YES YES YES ‐ 750 25017:00 YES YES YES ‐ 1000 ‐17:15 YES YES YES 500 500 ‐17:30 YES YES YES 1000 ‐ ‐17:45 YES YES YES 800 200 ‐18:00 YES YES YES 600 400 ‐18:15 YES YES YES 300 300 40018:30 YES YES YES 100 300 60018:45 YES YES ‐ ‐ ‐ 100019:00 YES ‐ ‐ ‐ ‐ ‐19:15 ‐ ‐ ‐ ‐ ‐ ‐19:30 ‐ ‐ ‐ ‐ ‐ ‐

PROPERTY COUNT

What is the purpose of the logged pressure point?

1. Early Warning System

• Pressure is not ‘normal’• Send alarm to control room• Proactive response• Hopefully before customer contacts

2. Post Event Reporting

• When the event occurred• How many customers did it impact• How long did is take to restore supply• Accurate Customer Counts

Early Warning System

Logged Point• ‘Normal’ pressure envelope

2 Alarm levels• AMBER – 10m @ Critical Point• RED – 5 @ Critical Point

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00:00 06:00 12:00 18:00 00:00

LOGGEDPOINT

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00:00 06:00 12:00 18:00 00:00

CRITICALPOINT

Where to pick the ‘optimum’ logging point?

1. DMA Structure - No 2 areas are the same• Connectivity• Rural / Urban• Topography• Hydraulic Performance• Population Density• Pumped / Gravity / PRV’d

2. Supply Interruption

• What causes the issue? • Burst• Site failure• Unknown demand or flush• Unintentional configuration

change

• Where is occurs?• End of zone• Next to supply meter• On trunk main upstream?

Practical Concerns

Space for Chamber Construction

Avoid busy highways & traffic management

Avoid problematic pipe materials (e.g. PVC etc.)

Good Communication

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Logging Point Options

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Customer weighted average pressure point within the control zone.1

1. Calculate the average customer pressure2. Identify point in network with this average pressure

Logging Point Options

Location nearest to the geographic centroid of customers within the control zone2

1. Find ‘Centroid’ of customer points2. Identify point closest to the centroid

Logging Point Options

A point that is 20% of the distance into the control zone when summating sequential mains.3

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1. Identify longest distance from supply meter2. Find point 20% of the total distance

Logging Point - Performance Measures

X Coordinate

Y Coordinate

Z Coordinate

Address

Location

Pressure Min

Pressure Av

Pressure Max

Model Results

Asset ID

Size (ID)

Material

Pipe Asset Data

AgeCritical

Headloss Ratio

Amber Alarm

Red Alarm

Relation to CP

Total Head Variance

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• 99% Model Coverage• 33 Model Areas• 3 regions

Up-scaling the Solution

• Various Models Ages• Built both in-house & consultants• Regular model maintenance

Challenges:• Control Zones Valid• Area Codes in model• Misaligned CZ and Pressure Zones

• 1887 Control Zones• 830 already contain a form of pressure monitoring

(44%)• Critical Point • PRV Inlet / Outlet • Other

• 1057 required (56%)

Wessex Water Pressure Monitoring

No Monitoring Existing Pressure Monitor

Sharing the data

• Spreadsheet data overwhelming

• Summary sheet more palatable

• Data presented on a zone by zone basis

• Sheet utilised by a survey team to assess the most suitable logging location

• Additional CZ performance measures cross referenced in spreadsheet

• Modelling process not ‘revolutionary’

• Est. 70% cost saving over manual methodology

• < 3% error for automation• Out of date Control Zones in models

• Well maintained model library essential to minimise errors in results

• Displaying model data in a user friendly format – very important

• Logging points need to be fed back into Network Models to facilitate incident planning and post event analysis

Project Outcomes

So what have we learned so far?

• It does work…..

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But, we must ….

• Strive for 100% ‘Real-Time’ data (15minutes minimum)

• Present the data effectively (Geospatially not a list!)

• Continue to improve our data quality and structure

• Alarms are critical, thresholds are outdated….’Artificial Intelligence’?

• Ensure our NRC team have the opportunity to utilise and develop their modelling skills

• Optimise the data we collect … maybe ‘Live modelling’ and ensure we integrate with leakage

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Thank you for listening…..

Any Questions?

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