Protecting the Integrity of Drinking Water Distribution Systems, 2005 – 2007

 

Canadian distribution systems leakage rates range from 5 to 50% from four types of risks such as major pipe breaks with loss of pressure, pipe breaks with pressure reduction, planned repairs (pipe leak with pressure maintained) and design/configuration of the system (orifice in main, dead-ends, flushing). Click here or on the pdf file to learn more or read an excerpt below.

 

Challenge

A significant portion of waterborne disease outbreaks have been shown to be caused by sources of contamination in water distribution systems (DS). These include cross-connections, contamination during repairs and contamination of reservoirs. Studies suggest that the current design and operations of DSs may not fully prevent contamination by intrusion. Research on pilot scale systems has shown that transient negative pressure in the DS provides an opportunity for back siphonage, backflow and intrusion. Canadian systems leakage rates range from 5 to 50%, providing possible entry points for intrusion under certain pressure conditions.

Project

The research project identified four types of risks related to intrusion in a DS: major pipe breaks with loss of pressure, pipe breaks with pressure reduction, planned repairs (pipe leak with pressure maintained) and design/configuration of the system (orifice in main, dead-ends, flushing).

 

 

 

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