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Water Services Training Group

Water Services Training Group. 13 th Annual Conference 10 th September 2009. Prioritising Mains for Rehabilitation/Replacement – Large Rural Areas. Gerard Gibney Managing Director. Introduction. Mains Rehabilitation/Replacement - Why? Large Rural Areas Prioritisation

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Water Services Training Group

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  1. Water Services Training Group 13th Annual Conference 10th September 2009

  2. Prioritising Mains for Rehabilitation/Replacement – Large Rural Areas Gerard Gibney Managing Director

  3. Introduction • Mains Rehabilitation/Replacement - Why? • Large Rural Areas • Prioritisation • Key issues for Effective Mains Rehabilitation/Replacement

  4. 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.

  5. Asset Life Time Costs Annual Cost of Replacement

  6. Asset Life Time Costs Annual MaintenanceCost

  7. Asset Life Time Costs Whole Life Cost = Cost of Maintenance + Cost of Replacement Minimum Whole Life Cost

  8. 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

  9. 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

  10. Internationally -What Others are Doing ? • US Projections - $100’s bn for water infrastructure over the next 20 years • Hong Kong - $ 2.5 billion Project • UK Water Companies rehabilitated 4,565Km (>1%) 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

  11. 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

  12. 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

  13. 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

  14. 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).

  15. How do we compare ? • Irl in an International Context (using Infrastructure Leakage Index (ILI))

  16. 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’

  17. 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

  18. Stage 1 Stage 2 WSTG Training Stage 3 – Rehabilitation Commenced National Water Conservation Programme }Advanced Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

  19. Water Conservation in Ireland 44% Extract from WSTG Guidance Manual “Network Management – Leakage Control” Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

  20. Current Situation In Ireland- Volumes of UFW Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

  21. 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 Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

  22. Asset (Network) Size Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

  23. 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 Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

  24. Effective Prioritisation of Works Information Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

  25. 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

  26. 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

  27. Information – Key! - Rural Water Programme Experience Demand Management Active Leakage Control + Pressure Management Mains Rehabilitation Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

  28. Effective Prioritisation of Works Information Analysis Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

  29. 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 Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

  30. Rehabilitation Strategy Reports - Prioritisation of DMA’s Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

  31. Rehabilitation Strategy Reports Prioritisation of DMA’s Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

  32. Prioritisation – Sample Counties- % UFW • Based on Countywide Rehabilitation/Replacement Reports and Projects Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

  33. Prioritisation – Sample CO’s % 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

  34. Effective Prioritisation of Works Information Analysis Implementation Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

  35. Implementation-Rehabilitation / Replacement Works Site Investigation Outline Design Archaeology Ecology Consent Licence Detailed Design Construction Works Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

  36. Effective Prioritisation of Works Information Value For Money Implementation Analysis Meeting the Challenges of the Changed Economic Environment Annual Conference September 2009

  37. 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

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