Thanks for the helpful replies and comments. I have watched this location over the last five years, and the flow does not increase significantly even during hurricanes and severe rains which cause flooding in the region. It is primarily spring fed. I also had the forestry dept calculate the culvert size needed, and they only calculated 18". Because the stream bed takes a very gradual bend in this area, I am now thinking about using HDPE pipe. I believe that it may be possible to have plastic pipe approximate the natural bend in the stream bed- also it would not have the sealing problem that I would have with concrete. I have already received permission from the forestry department to proceed, I just have to notify them before starting. In our state, if the crossing was to be used for other purposes, there would be multiple approvals required as some of you mentioned.
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Today's Featured Article - Measuring with Calipers - by Staff. The legs of inside calipers are curved outward at the extremities to facilitate measuring small holes, while outside caliper legs have a large curve inward to increase their capacity for large work. Firm-joint calipers are adjusted approximately by the hands and then set to the feel of the work by tapping them on a metal surface. It is a common practice when opening calipers by this means to tap the top of the joint. It is better, if possible, to tap the inside of the legs, as repeated blo
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