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Water Main Breaks vs. Number of Water Mains

This is the graph that stunned me into silence in 2001. I had twice as many mains with ten breaks as eleven; twice as many again with nine, twice again with eight, all the way down. The only bend in the curve is the high number of mains with zero breaks - because half our system is plastic and that has basically zero breaks because of Calgary's ultra-conservative, careful install practices with PVC.

© Roy Brander, P.Eng 2016