The last time something like this happened, the April 21, 2008 Montreal Gazette reported that water levels rose 25 cm when all 14 gates were opened and the daily flow rate was 6,060 cubic meters per second.
|Map of Ottawa River Carillon Dam|
|May 2017 Carillon Dam Flow Rates|
Update May 8, 2017: The flow rate of the dam was 8,793 m3/s yesterday and reached 8,900 today, which is markedly close to the trend-line. Officials are now saying the peak is near and by Wednesday the water should recede.
Historically,the chart below shows the daily maximums and minimums for the dam. As you can see, the highest ever recorded was 8,190 m3/s in 1976 and before that 8,105 m3/s in 1974. Now, as of May 6, 2017 the daily average flow rate was 8,121, just 0.85% away from the record high. As they open the 14th gate at Carillon surely the flow rate will reach the highest levels ever, as too will the water levels in the surrounding areas of greater Montreal.
|Daily Maximum and Minimum Flow Rates for Carillon Dam|
|Carillon Dam Flow Rates by Month per Year|