This isn't exactly a bridge/culvert scenario because the grading for the 200' of overland flow is not consistent. Is there a way to model the culvert and overland flow all in RAS? The pipe is way under capacity obviously, and what i think happens is that the pipe passes X amount of water and the rest is overland flow (above the pipe) for the 200 feet until you pick up the stream on the other side. I am currently using hec ras 4.1.0 and have a situation where i have the stormwater from a 300 acre drainage area traveling down a stream and the stream becomes a 30" pipe that is 200 feet long, and then the stream picks up again on the other side.
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