Pipe Materials in Calgary Presentation Slide #25

Well, a quarter century later, I'm prepared to retract some of that assertion on behalf of my predecessors.
We not only have data from another 25 years of break rates, but data from sandblasting thousands of metres of recovered mains and measuring pit depths. This graph follows the break rates for the DI and PDI that is still in the system today, so the breaks are all from the same cohort of pipe.