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Water Services National Training Group and National Federation of Group Water Schemes

Water Services National Training Group and National Federation of Group Water Schemes. 7 th Annual Rural Water Services Conference 18 th September 2008. Treated Water Demand Management, Leakage Control & Conservation Joe Gallagher N.F.G.W.S. Introduction.

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Water Services National Training Group and National Federation of Group Water Schemes

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  1. Water Services National Training Group and National Federation of Group Water Schemes 7th Annual Rural Water Services Conference 18th September 2008

  2. Treated WaterDemand Management, Leakage Control & ConservationJoe GallagherN.F.G.W.S

  3. Introduction • The Need for Water Demand Management? • Implications of high Unaccounted for Water (UFW) • Reducing UFW on Group Water Schemes • New Training Course Reducing daily water demand on Group Water Schemes

  4. Why is there a need for Leakage Control on Group Water Schemes?Example of DBO Schemes in Year 2 of O&M Contract

  5. Reasons Schemes exceed design demand • Deficient distribution networks • Major leaks • Lack of PRVs • Lack of Metering • Bulk Meters • Universal Meters • Charging policies • Over reliance on flat rate charging • Resistance to realistic usage charge • Unknown Sources of Demand

  6. Leakage in Distribution Mains Vs Consumer Side • Leakage across 6 GWS in Co. Mayo Slide Sourced from Ryan Hanley Consulting Engineers

  7. What are the Implications of UFW? • Cost • Capacity of treatment plant • Sustainability of source • Quality • Supply & pressure

  8. Galway GWS (90 Houses)

  9. Burst in Distribution Pipe Network • At a pressure of 30m(3 bar) the following losses will occur: Slide Sourced from WSNTG Leakage Control in Rural Supply Networks

  10. Extent of Water Loss From Leaks/Bursts • At a pressure of 30m(3 bar) the following losses will occur: Slide Sourced from WSNTG Leakage Control in Rural Supply Networks

  11. The Cost of Water A 450m3 reservoir @ €1.20/l would store water worth €540,000 Typical Litre of bottled water €1.20 What is this load worth?

  12. Cost Implication for Scheme Members Figures from a GWS: • GWS charge is 80 cent/m3 • (€3.60 per 1,000 gallons)

  13. Capacity of Treatment Plant • Ability of Treatment Facility to cope • Design Demand • GWS with high UFW reach their Design Demand much more quickly • Plant failure, water outages and/or failures in water quality

  14. Sustaining the Source • Excessive abstraction • This will impact on surface and groundwater supplies and may result in: • Slower recharge of the source • Poor quality raw water being drawn into the treatment plant • Increased costs for monitoring and treatment

  15. Supply & pressure • Potential difficulty in admitting new members • A scheme with 50% UFW has the capacity to increase its domestic membership by a third when UFW is reduced to 25%! • Members situated on the network beyond a leak in the system may be affected by poor pressure and breaks in supply

  16. Calculating Legitimate Demand • Average daily usage figures from the National Water Study: • Schemes need to estimate the numbers served on the scheme in relation to: • Human population • Dairy Cows • Drystock • Others (e.g. Sheep/Calves/Poultry/Mushroom)

  17. Setting Targets • 25% UFW is considered acceptable, but is it enough? • Kilmaley Inagh GWS – 1900 Houses with < 10% UFW: • Installing /Monitoring district & consumer meters • Isolating the network into District Metering Areas (DMAs) • Repairing leaks and replacing critical mains • Monitoring the distribution network on a consistent basis • Implementing realistic pricing policies, based on usage

  18. Setting Targets Erne Valley GWS - > 1,100 Houses (2007 Figures) • Original Usage 5,700 m3/day • Target 3,000 m3/day • 2007 usage 3,300 m3/day • 2008 usage 2,900 m3/day • UFW (REDUCTION) 2,800 m3/day • 49% Reduction • Saving to Scheme > €250,000 aprox. p.a.

  19. Reducing UFW in Distribution Network • Reduce Distribution Network to < 25% UFW 4” Pipe 3” Pipe 2” Pipe Service Pipe District Meter M Consumer Meter Box

  20. Reducing UFW in Distribution Network • Reduce Distribution Network to < 25% UFW • Typical District Metered Area 4” Pipe 3” Pipe 2” Pipe Service Pipe District Meter SV M SV Consumer Meter Box

  21. Reducing UFW in Distribution Network • Reduce Distribution Network to < 25% UFW • Typical District Metered Area • Possible solutions identified • Consult with GWS Engineer Leaks Critical Mains Rehab District Meter SV PRV M SV Pressure Reduction Valve Reducing Pressure from 70m to 40m should reduce leakage by 55% Consumer Meter Box

  22. GWS with 90 Houses • What Caused this Fluctuation in Measured Daily Usage on this GWS?

  23. GWS with 90 Houses Meters Installed

  24. GWS with 90 Houses Meters Installed Bills Issued

  25. This Part - Private Mayo GWS successfully reduced its UFW through: Active Leakage Control Critical Mains Replacement Pressure Reduction Demand Management Mayo GWS (150 Houses)

  26. The results can be seen in the table below: Mayo GWS (150 Houses)

  27. Reducing daily water demand on Group Water Schemes • Requirement for training in Water Demand Management • Developed by the NFGWS as an introductory course to be delivered to the GWS sector in advance of the more detailed WSNTG course: “Leakage Control in Rural Supply Networks”

  28. Course objective • To provide a practical framework for schemes dealing with high levels of water wastage, in particular unaccounted for water (UFW) and • To assist those schemes wishing to maintain and improve their current low levels of water wastage and UFW.

  29. Course Format • Four Modules • Module 1: What is UFW? • Module 2: What are the implications of UFW? • Module 3: How can UFW be quantified? • Module 4: How can UFW be reduced?

  30. Conclusion • High UFW will have cost, capacity and supply implications for GWS and the individual member • High UFW may affect the sustainability of the source and also the quality of water supplied • UFW must be reduced • This Course is design to do exactly that • Delivered in your locality • < 3 Hours to complete • At €75 per head it’s a steal!!

  31. Contact Details Joe Gallagher & Barry Deane Training Co-ordinators N.F.G.W.S. 12 Henry Street Tullamore Co. Offaly Tel / Fax: 057 9328068

  32. Water Services National Training Group and National Federation of Group Water Schemes 7th Annual Rural Water Services Conference 18th September 2008

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