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Your idea seems like it will work. I am guessing you will place the 12" piece in the bottom half of the larger culvert? The pressure of earth/gravel will be high. I would mix up some concrete and pour it over the smaller pipe at the join to re-inforce the joint and prevent water from going through the joint.
Best
Les
__________________
Best
Les
My train of thought has been replaced by a bumper car.
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