So we understand each other, I don't disagree with you on the issue. I was just surprised that it was still a problem.
Keep at it, and try using the power of the local press to embarrass those in charge for failing to fix this after 40+ years.
If your local TV station has one of those problem solver teams, reach out to them. One possibly good angle might be that the cost of the one settlement (known of) was probably more than the cost of replacing all those grates.
The problem is that you're dealing with politicians and civil servants who have no personal investment to act. You need to change that.
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