Some initial info on the water main assessment.
https://globalnews.ca/news/10872670/...ain-break/amp/
High chlorides in water, microcracks in the mortor leading to corrosion and hydrogen embrittlement.
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According to the city, the preliminary findings indicate that several factors may have contributed to the pipe failure including microcracking of the “protective mortar” outer layer of the pipe, chloride levels in the soil at various locations along the line, as well as wires snapping due to “corrosion and hydrogen embrittlement.”
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According to the city, preliminary review found the original design of the pipe was “consistent with the proper guidelines of the time and operations of the pipeline were well within the design parameters of the pipe.”
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No mention if the integrity program was consistent with good practice yet.
The report will submitted on Dec 11th.