There are many ways to mitigate the catastrophic flood event impact in Calgary, which would have to be used in combination. Deepen the Bow and Elbow river beds, construct diversion and overflow channels, raise river bunks where possible, build accumulating reservoirs (lakes, swamps) etc. So, not impossible. Expensive, yes. Practical? Perhaps, but it's hard to say yet. Last flood of this magnitude occurred here in 1929, I believe. Based on that re-occurrence rate – probably not practical. But as climate is changing, we can see these events more frequently; thus, making a $10-20B investment in flood mitigation measures less ridiculous and more forward-looking.
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