Quote:
Originally Posted by Riverman
I don't know what that means, it might another datum they're working to. The engineers have set up an office trailer on Carmen Avenue at Glenwood for just this reason - to help the neighbours understand what's going on. If you are going to go and ask I'd like to go with you as I want to absorb all the info I can. I signed up to be a dyke captain for my street.
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Hey, just got off the phone with Lloyd (city of wpg flood coordinator). The numbers on the stakes are the metric "meters above sea level". They just dropped the "200" because that was implied.
So, when I have a stake that reads 29.522, it actually means 229.522 to the TOP OF THE STAKE (the orange ribbon at the top). To convert metric to imperial you need to divide by 0.3048.
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In my scenario:
Stake near house says 229.522
229.522/0.3048 = 753 ft at the top of the stake
Distance between top of stake and the ground is approx 3 ft, so the ground level of my walk-out basement is 750ft.
Datum is 727.5 ft, so in theory, if the water rises to 22.5 feet above datum, I would have a trace amount of water hitting the house.
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This is where it gets confusing. In 2009 the water did rise to 22.6ft on its 2nd crest (no ice jams).
The water did not touch our house although based on city measurements, it should have. Based on the city website, the difference between St-Norbert (far south) water levels and Kildonan bridge (far north) is as much as 6 feet during peak flood times. This makes sense, the water runs North to lake Winnipeg. I am trying to determine where my house fits along that span.
Because I am in between James Ave and the Kildonan Bridge, the water level at my house will be LESS than James, but MORE than Kildonan. The difference between those two points in 2.5 ft (based on historic flood levels). My theory was proven in 2009 when the water SHOULD HAVE BEEN HITTING MY SANDBAG DIKE, but didn't. Based on this, I am quite certain that flood levels in my yard are 1ft less than James.
So, practically speaking, the water levels at James would need to hit 23.5 ft before I get a trace of water near my house.