Originally Posted by cb100
I am trying to figure out sizing for culverts in a creek crossing. Currently we have four forty inch culverts in place normally its fine but it has gone over the top four or five times in the last ten years. This year twice. I am looking to put another row of culverts above the fortys. And am trying to figure out the difference in flow between various sizes

Have you talked to your counties NRCS office?

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