Quote:
Originally Posted by octothorp
I'm skeptical about their ability to accurately determine what a 100-year flood is, given that there have been so many conflicting reports about what this last flood is. In regards to the Bow, I've heard this estimated as everything from a 50-year to a 100-year flood. It also seems that this sort of estimation changes based on actual floods. So what might be a 100-year flood now might be re-estimated to be a 50-year flood based on the next few years of weather patterns.
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This is the map to The City of Calgary's Floodway / Flood Fringe. It looks like these maps are before this flood. I'm pretty these maps are based on the 100 year flood and they look pretty close to the maps the AB government just put out. I am also pretty sure that a 100 year flood is not a flood that occurs once every 100 years, but rather the worst flood in the last 100 years. So that flood could have occurred in 1913 or 2013, or even multiple times in between. I too haven't heard if this was a 100 year flood or not.