A city has asked me to design a culvert to replace one that they say is in "bad shape". I look at the culvert and it is a cm arch culvert with concrete walls for footings and a concrete bottom. Its diameter is equivalent to 8' and is under a busy road, in a flowing stream. The problem seems to be, not the pipe, but severe erosion at the outlet. The stream has undermined the wing walls and there is a fall of about 4' from the pipe to the stream. There seems to be a better solution of fixing the outlet situation instead of replacing the culvert. Am I missing something? I don't want to tell the city that we can just fix the outlet situation and they tell me why it would need replacing, thus I look like the idiot!
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