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The Flood was Man-Made (confirmed)

You are here: Home / Media Bulletins / The Flood was Man-Made (confirmed)

May 18, 2012 //  by twinlakes//  Leave a Comment

Thursday, May 17, 2012

The majority of the flooding on Lake Manitoba in 2011 was artificial – A Rebuttal to Greg Selinger

The Majority of the Flooding on Lake Manitoba was artificial flooding: 

In Estimates in response to a question from me, Premier Greg Selinger said:

“And I think there’s even a view among some people that, even if the diversion had not been used, that the dikes would have breached and would have impacted the communities on Lake Manitoba, including Delta Beach and Twin Beaches and St. Laurent, et cetera, and would have put a lot of additional water into Lake Manitoba, even in the absence of the diversion, because of the way the land flows. And the water would have wound up there, and then it probably would have wound up in Lake St. Martin as well. So we just had a heck of a lot of water, and it needed to go someplace, and I think the diversion was used to minimize the negative consequences for as many Manitobans as possible.”

Andy Zubrycki wrote to me to say that the Premier must be “well aware that the majority of the flooding on Lake Manitoba last year was artificial, and it troubles me that his response seems to imply that much of the water that entered via the Portage Diversion would have gone into Lake Manitoba regardless. In fact, as you may be aware, the province’s own flood forecasters know this is not the case, and acknowledge that only a minor portion of the Diversion’s flow would have entered the lake naturally.”

“In a moment I would like to forward a reply that I received from them in December of 2011, in which the Director of Flood Forecasting answers one of my queries, noting that in fact, only 20-30% of the water from the 4.13 feet of height-equivalent channelled through the Portage Diversion is believed to have been “natural” input. The other 70-80% from the Diversion was artificial. Again, this is according to the Director himself. If this information is not already readily available, then I am hopeful that these facts could be referenced in case there are attempts in the future to imply that the flooding was natural, since it so clearly was not.”
Andy Zubrycki asked

“Could you please confirm the total volume of water that was channelled in through the Portage Diversion from April 6 until early August this year, and what this is equivalent to in terms of feet of water added to Lake MB? “
Phillip Mutulu,, Director of Flood Forecasting and Coordination for Manitoba replied:  “In 2011 flow was conveyed from the Assiniboine River to Lake Manitoba via the Portage Diversion from April 7 to August 5; a period of 121 days.  The total volume carried by the Portage Diversion in 2011 was 4.7 million acre-feet, or 5,800 million cubic metres.  This is equivalent to 4.13 feet of storage on Lake Manitoba.”
Andy Zubrycki also asked “I’m also aware that the actual artificial volume contributed was slightly lower (one non-government article I read said 20%) due to the fact that some of the water would have naturally flowed into lake. I imagine that it can be a difficult estimate, but is this 20% figure a good estimate?”
Phillip Mutulu, Director of Flood Forecasting and Coordination for Manitoba replied “This natural overflow volume is very difficult to estimate, but detailed modelling studies are currently under way to determine what that volume might be.  Preliminary estimates are that the natural overflow from the Assiniboine to Lake Manitoba with 2011 Assiniboine River flows (adjusted to remove the effect of Shellmouth Reservoir operation) would be in the order of 1 to 1.5 million acre-feet (1200 to 1800 million cubic metres).  That would be 20 to 30% of the total volume diverted in 2011.”
It should be noted that that above just considers the impact of the water coming through the Portage Diversion.  If one considers the government’s “drain, drain, drain” policy which has moved much more water off the land more quickly, then the impact of human and government induced changes has had a much larger impact on the flood of 2011

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