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Post by graywolf on Nov 10, 2015 5:28:49 GMT -8
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amaruq
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Call me Little Spoon
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Post by amaruq on Nov 10, 2015 7:03:17 GMT -8
The mean flow of the St. Lawrence river near Montreal exceeds 7,800 m3/s, or 673,920,000 m3/day. Assume a construction period of 2 weeks (the article states they have until December 5 to wrap everything up) for which they will be discharging 8,000,000,000 L or 8,000,000 m3. This is 571,429 m3/day, or less than 0.09% of the mean river flow. Low taxes, High quality of infrastructure and thus life, Zero ecological/environmental impact: pick two. |
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Post by Lamebeaver on Nov 10, 2015 7:39:50 GMT -8
Seems to me they should be able to come up with a bypass solution that would greatly reduce the amount discharged into the river.
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FamilySherpa
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Post by FamilySherpa on Nov 10, 2015 7:58:14 GMT -8
The mean flow of the St. Lawrence river near Montreal exceeds 7,800 m3/s, or 673,920,000 m3/day. Assume a construction period of 2 weeks (the article states they have until December 5 to wrap everything up) for which they will be discharging 8,000,000,000 L or 8,000,000 m3. This is 571,429 m3/day, or less than 0.09% of the mean river flow. Low taxes, High quality of infrastructure and thus life, Zero ecological/environmental impact: pick two. I really don't know enough about the history of the infrastructure repairs to comment on what could have been done to prevent this, but this seems like an awfully slippery slope way of looking at this. If we were allowed to do X, can we get away with X+1, X+2, +3........
Isn't this sort of what happened with the East River in NYC?
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Deleted
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Post by Deleted on Nov 10, 2015 8:01:05 GMT -8
From the article: Not really surprising. |
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amaruq
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Post by amaruq on Nov 10, 2015 8:47:14 GMT -8
I really don't know enough about the history of the infrastructure repairs to comment on what could have been done to prevent this, but this seems like an awfully slippery slope way of looking at this. If we were allowed to do X, can we get away with X+1, X+2, +3........
Isn't this sort of what happened with the East River in NYC?
I'm not familiar with NYC's East River. The history of infrastructure maintenance in Montreal is the butt of many jokes up here. That is to say, there isn't very much history of said maintenance. Ultimately, this is the lesser of two evils for a given price point. " On Monday, Catherine McKenna, Canada's environment and climate change minister, said the city could proceed with its plan once it meets the conditions for monitoring and minimizing the environmental impact.Calling the city's plan 'far from ideal,' she agreed with the findings of an independent panel of scientists that the city's planned release this fall was preferable to an accidental release of wastewater caused by Montreal's decaying sewer system." Personally, I think there are other -- albeit costlier -- means to lessen the impact, but I don't have the ins and outs of the project and what diversion options are available. I can give an example of a similar project I know more about: I was a part of a project in Toronto where a damaged section of trunk sewer needed repair and/or bypassing. The sewer transmits 400,000 m3 of effluent per day and the emergency plan (should the sewer collapse or otherwise become blocked) was to divert the flow into a nearby river. This was because it had no other means of diversion. The river's baseline flow is on the scale of 345,600 m3/day. That's more raw effluent than water, which would effectively turn the waterway into an open sewer, contaminating the kilometers of parkland along the river. We tunneled a bypass sewer around the damaged section and then permanently connected it to the existing sewer through -- very simply put -- a pair of high-risk swap-outs of straight-pipes for elbow-pipes (these pipes are almost 9' diameter and had to be installed in deep excavations) under live-flow at 12:00-3:00am. Notice the sewer steam rising out of the 130' deep shaft as this elbow is being swung into position over it.  |
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Post by graywolf on Nov 10, 2015 9:12:44 GMT -8
Very informative post amarug. I still wish there was another way but you have at least helped me to understand the situation better.
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johnnyray
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Post by johnnyray on Nov 10, 2015 9:33:15 GMT -8
That's the way we've always done it.
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