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Originally Posted by burn_this_city
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Very good read for anyone who follows this thread. I just wish people would get that they aren't saying to implement everything the Montreal Engineering report suggests, but rather at least take a good look at what could be done to mitigate damage from future floods, since they will happen...it's just a matter of time.
Trying to imagine the "worst meteorologically likely storm" with a peak Bow River flow of 6145 m3/s is insane. Hopefully we will never see close to that.
EDIT: Reading this report on Alberta Transportation's site about flood frequency analysis (
http://www.transportation.alberta.ca...ffasixcase.pdf) was interesting. It notes that it is difficult to arrive at frequency conclusions for the Bow River basin because the events in the late 1800s and early 1900s varies so much from the rest. One report noted that "extensive forest fires that are said to have burned 60% to 80% of the Eastern Slopes in the late 1800's and early 1900's might partially account for the extreme floods before 1910." Also, there is apparently no explanation for the "major shift in rainstorm patterns after 1932".
This report notes that the lack of cyclonic rainstorms that draw moisture from the Gulf of Mexico are one reason for the lack of floods in a long period of time. The 2013 storm was definitely cyclonic in motion.
Very interesting stuff.