Water Services Training Group

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Water Services Training Group

• 13th Annual Conference
• 10th September 2009

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Prioritising Mains for Rehabilitation/Replacement
Large Rural Areas

• Gerard Gibney
• Managing Director

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Introduction

• Mains Rehabilitation/Replacement - Why?
• Large Rural Areas
• Prioritisation
• Key issues for Effective Mains Rehabilitation/Repl
  acement

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Why implement Mains Rehabilitation/Replacement?

• On one hand
• Budgetary Constraints
• But
• Water Networks
• Do Breakdown/Deteriorate
• Do Require Maintenance
• Do Require Replacement/Rehabilitation
• Failure to manage networks based on least life
  cycle cost strategies will result in increased
  cost over the long term.

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Asset Life Time Costs
Annual Cost of Replacement
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Asset Life Time Costs
Annual Maintenance Cost
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Asset Life Time Costs
Whole Life Cost Cost of Maintenance Cost of
Replacement
Minimum Whole Life Cost
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Value for Money

• In the current economic environment value for
  money is paramount
• Targeted Spending - Cost Effective
• Systematic and structured approach
• Asset Management
• Most Efficient Repair/rehabilitation
• Planned Repair/Rehabilitation 70-80
• Reactive Repairs/Rehabilitation 20-30

Thinking, Getting and Staying Competitive A
Public Sector Handbook, Association of
Metropolitan Sewerage Agencies and Association of
Metropolitan Water Agencies, 1998
Meeting the Challenges of the Changed Economic
Environment Annual Conference September 2009
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Asset Management

• Initially Asset Management requires the
  development of
• Asset Inventories
• (CIS - a good starting point)
• Critical Asset Lists
• (For water networks this is a product of Stage 1
  and Stage 2 Works L6/07)
• Stage 3 Water Conservation vital part of Asset
  Management

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Internationally -What Others are Doing ?

• US Projections - 100s bn for water
  infrastructure over the next 20 years
• Hong Kong - 2.5 billion Project
• UK Water Companies rehabilitated 4,565Km (gt1) of
  Water Mains in the 2006-2007 period.
• 1,489Km Relined
• 3,076Km Replaced

From Financial performance and expenditure of
the water companies in England and Wales 2006
-2007 report by OFWAT
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Case Study Greater Berlin Water Supply System

• West Berlin vs. East Berlin (pre-reunification)
  where systematic network replacement (circa 1
  p.a) had been carried out in West Berlin but not
  East Berlin

Bursts per Km
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Case Study Greater Berlin Water Supply System

• 1991-2005 (Systematic replacement of network in
  East Berlin circa 1.5 p.a West Berlin circa
  0.65 OA 0.8-1)

Bursts per Km
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Case Study Greater Berlin Water Supply System

• Notice that 20-40 year old cast iron was bursting
  more frequently than 50-80 year old.

Cast Iron
Bursts per Km
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Case Study Greater Berlin Water Supply System

• After studies and large initial investment Berlin
  Water calculated that the optimum replacement
  requirement over 10 years was 0.25 per year (OA
  0.375 p.a).

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How do we compare ?

• Irl in an International Context (using
  Infrastructure Leakage Index (ILI))

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Why implement Stage 3?

• International Findings
• Netherlands Annual Investment
• 507m (1997) to 341m (2007)
• . emphasis on quality investments decisions to
  replace pipelines are based on better information
  provision (smart asset management) - Vewin Water
  Company, Water Supply Statistics (2007)
• SMART ASSET MANAGEMENT

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Mains Rehabilitation - L6/07

• Rehabilitation of watermains.address different
  problems e.g. leakage, security of supply,
  quality, flow restriction etc... Water
  Conservation is the primary objective.

Meeting the Challenges of the Changed Economic
Environment Annual Conference September 2009
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National Water Conservation Programme

• Stage 1
• Stage 2
• WSTG Training
• Stage 3 Rehabilitation Commenced

Advanced
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Water Conservation in Ireland
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Extract from WSTG Guidance Manual Network
Management Leakage Control
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Current Situation In Ireland- Volumes of UFW
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Leakage Management

• Active Leakage Control
• DMA Monitoring
• Leak Detection
• Leak Repair

• Pressure Management
• Reduce new break
  frequencies
• Reduce real losses

• Pipeline and Assets Management
• Selection
• Installation
• Maintenance
• Renewal
• Replacement

• Demand Management
• Consumer metering
• Water efficient fixtures
• Public awareness

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Asset (Network) Size
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L6/07 Prioritisation Strategy

• Rehabilitation Strategy
• Current status of Water Conservation Programme
• Identify critical DMAs (Prioritise by DMA)
• Rehabilitation Works Proposals
• Assessment of mains (Prioritise Mains)
• Develop work packages

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Environment Annual Conference September 2009
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Effective Prioritisation of Works
Information
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Information Key!

• Stage 1 2 Works Ongoing
• Active Leakage Control
• Pressure Management
• Demand Management
• Data Management Systems
• CiS
• Leak Repair Database
• Telemetry Systems
• Non-Domestic Metering
• Resources
• Project Management Team
• Leak Detection Teams
• Leak Repair
• CiS Maintenance

Meeting the Challenges of the Changed Economic
Environment Annual Conference September 2009
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Information Key! - Rural Water Programme
Experience

• Challenges in GWS Rural Water Sector
• High UFW
• Limited Fittings Stoptaps, Valves
• Poor Information Location, Bursts, Fittings
• Limited Resources Part-time caretakers
• High Ratio of length of service
  connections/length of distribution mains
• Shared Service Connections
• Advance Works
• Installation of Stoptaps to determine extent of
  distribution side and consumer side leakage
• Installation of DMA meters and valves to
  identify sections of distribution mains with high
  leakage

Meeting the Challenges of the Changed Economic
Environment Annual Conference September 2009
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Information Key! - Rural Water Programme
Experience
Demand Management
Active Leakage Control Pressure Management
Mains Rehabilitation
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Environment Annual Conference September 2009
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Effective Prioritisation of Works
Information
Analysis
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L6/07 Prioritisation Strategy

• Prioritise by DMA
• Characteristics of Mains
• Connections
• Structural and Leakage Performance
• Water Quality
• Hydraulic Performance
• Prioritise Mains
• Burst Frequency
• Leakage
• Physical Condition
• Soil Corrosivity
• Head Loss
• Age
• Importance

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Environment Annual Conference September 2009
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Rehabilitation Strategy Reports - Prioritisation
of DMAs

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Environment Annual Conference September 2009
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Rehabilitation Strategy Reports Prioritisation
of DMAs

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Environment Annual Conference September 2009
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Prioritisation Sample Counties - UFW

• Based on Countywide Rehabilitation/Replacement
  Reports and Projects

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Prioritisation Sample COs Rehabilitation
Replacement 0.8 to 1.1 p.a.

• Based on Countywide Rehabilitation/Replacement
  Reports and Projects

Meeting the Challenges of the Changed Economic
Environment Annual Conference September 2009
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Effective Prioritisation of Works
Information
Analysis
Implementation
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Environment Annual Conference September 2009
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Implementation-Rehabilitation / Replacement Works
Site Investigation
Outline Design
Archaeology Ecology Consent Licence
Detailed Design
Construction Works
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Environment Annual Conference September 2009
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Effective Prioritisation of Works
Information
Value For Money
Implementation
Analysis
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Environment Annual Conference September 2009
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Conclusions/Summary

• Information is Key !
• Stage 1 2 Mainstream
• Cost Effective Targeted Spending
• Stage 3 Mains Rehabilitation
• SMART ASSET MANAGEMENT

VALUE FOR MONEY
Meeting the Challenges of the Changed Economic
Environment Annual Conference September 2009