Managing leakage by managing pressure - …

1 Conferenze sulle Strategie di Gestione delle Perdite Idriche Managing leakage by Managing pressure IWA Water 21 October 2003 rev. Julian Thornton Thornton International IWA Water Loss Task Force Visit Italy Genova Ferrara 15-19 May 2006 1. Water 21 journal article IWA Water Loss Task Force Visit Italy Genova Ferrara 15-19 May 2006 2. IWA WLTF pressure management team 31 members from 11 countries team focus: Compile case studies on PM success/ failures Investigate new equipment & methods Test N1 predictions to predict leak flow changes w/. pressure Develop & test N2 factor to predict break frequency w/ pressure Develop and test N3 factor to predict customer consumption changes w/ pressure As we get closer to our goals it is ever more important to be able to predict benefits the first savings are easy but they get incrementally more difficult to produce IWA Water Loss Task Force Visit Italy Genova Ferrara 15-19 May 2006 3.

2 Article transition and revision Published October 2003. Focus on out reach and awareness building Currently under revision Update scheduled for publication 2007. Key revision - N2. pressure vs. break frequency predictions Key revision - pressure is perceived as an operational indicator no pressure no loss more pressure losses increase How to bench mark performance in systems where pressure is increasing due to improved supply conditions IWA Water Loss Task Force Visit Italy Genova Ferrara 15-19 May 2006 4. Definition of pressure management The practice of Managing system pressures to the optimum levels of service - ensuring sufficient and efficient supply to legitimate uses while: protecting the system from the source eliminating transients and faulty level controls reducing unnecessary or excess pressures all of which cause the system to leak unnecessarily IWA Water Loss Task Force Visit Italy Genova Ferrara 15-19 May 2006 5.

3 pressure management and infrastructure pressure management is a short and medium term action It can help to extend the life of existing infrastructure But should not be used in place of infrastructure management programs The two tools complement each other IWA Water Loss Task Force Visit Italy Genova Ferrara 15-19 May 2006 6. pressure management tools Pump control pressure relief Distribution districts pressure sustaining Altitude control for storage pressure reducing Fixed outlet valve control Time modulated valve control Flow or demand based valve control Remote node closed loop valve control IWA Water Loss Task Force Visit Italy Genova Ferrara 15-19 May 2006 7.

4 pressure management and demand pressure management can be and is used as a demand management tool It is extremely efficient for Managing un-wanted demand It can be very effective as a single point conservation tool It can be very effective for reducing the negative impact of theft or fraud IWA Water Loss Task Force Visit Italy Genova Ferrara 15-19 May 2006 8. Illegal connections Malaysia IWA Water Loss Task Force Visit Italy Genova Ferrara 15-19 May 2006 9. Illegal connections Bahamas IWA Water Loss Task Force Visit Italy Genova Ferrara 15-19 May 2006 10. Illegal connections Brasil IWA Water Loss Task Force Visit Italy Genova Ferrara 15-19 May 2006 11.