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I'm no hydraulic engineer but I think the real problem is the storm water drain.
Once the outlet to the storm waterdrain gets plugged during a rain storm, the drain builds up significant backpressure, and I believe there is a leak somewhere near where the bobcat is hammering in the last picture. That leak undermines the street, which eventually collapsed.
I have been at the launch during heavy rains and seen the water pooring out of the leaky pipe drain from under the road, and shooting up out of cracks in the sidewalk, while the metal/wood cage at the outlet looked like a guiser.
Like others have said I'm just glad they are fixing it period....just be glad we're not in one of those less access friendly citys to the north, then it would take two years and a couple lawsuits to get work started.
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