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A hole large enough to be seen by planes flying overhead is just one small part of Calgary’s flood control work.
The 13-meter-diameter hole along 10 Street NW is large enough to accommodate a bus and goes 20 meters underground. A power drill will make its way to 7 Street NW and Memorial Drive, creating a tunnel connecting to the Bow River.
Department 7 count. Terry Wong said the upper plateau separation is designed to divert rainwater from higher elevations directly into the river.
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“It basically separates the stormwater from the upper part (north of Hillhurst/Sunnyside) and doesn’t spill over into the lower area,” Wong said.
The chairman of the Hillhurst Sunnyside Community Association’s flood control committee said it is one of the most important flood control projects for Sunnyside.
Charlie London described it as a “highway” for water.
“It will bring the water straight into the river instead of flowing through Sunnyside, because when the river is even just a little bit high and the river gates are closed, that water in the past – and even today – flows back to Sunnyside” , he said. told Global News.
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London, a resident of the area since 2005, said water from the North Hill backing up to Sunnyside is a common challenge.
He said the city has been looking at several options to resolve the issue.
“They looked at all sorts of alternatives that didn’t involve this technical level, and nothing else worked,” London said. “This is where we ended up, because this is the best solution.”
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The work will occupy one lane of 10 Street NW, near 5 Avenue and the sidewalk, and Wong said the impact on the surrounding community was minimal.
The river path near 7 Street has also been rerouted.
“Certainly, the cyclists going up and down the hill have to navigate around the construction site. But again, they’ve protected the area so the cyclists are protected from the roadway,” the area councilor said.
In June 2013, floods caused more than $400 million in damage to city infrastructure and $5 billion in damage across the county.
A 2019 report from Public Safety Canada found that flood mitigation efforts yielded a 1-to-7 to 1-to-10 return on recovery costs after a flood.
“We’re on budget — it’s a $48 million project — and we’ll definitely be on time,” Wong said.
© 2022 Global News, a division of Corus Entertainment Inc.