Why did Calgary's feeder main break? A new report shares the answer
CTV
The final report on the Bearspaw feeder main break is scheduled to be presented to a city committee on Wednesday, along with a price tag on the repairs, which is in the neighbourhood of $35 to $45 million.
The final report on the Bearspaw feeder main break is scheduled to be presented to a city committee on Wednesday, along with a price tag on the repairs, which is in the neighbourhood of $35 to $45 million.
The City of Calgary's infrastructure and planning committee will be given the nearly 600-page report during its regular meeting.
According to the agenda, the report is expected to "provide the final, detailed results" on the investigation into the Bearspaw south feeder main, including the cause of its failure on June 5.
It's also supposed to "prioritize asset condition assessments" and help to manage risk.
The report, produced by Associated Engineering, said that design and operations of the feeder main did not contribute to its failure, but "several failure mechanisms" and "soil conditions" did.
"The cause of the June 5 failure was the breakage of a sufficient number of prestress wires in a pipe segment causing a loss of pressure resisting capability in the pipe," read highlights of the report, included in the committee's agenda for Wednesday.
"The prestress wires are wrapped under significant tension around the pipe’s outer concrete core. The wires are protected with cement mortar.
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The final report on the Bearspaw feeder main break is scheduled to be presented to a city committee on Wednesday, along with a price tag on the repairs, which is in the neighbourhood of $35 to $45 million.
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