I've got a tricky hydraulic open channel modeling problem (see the attached rough sketch). Essentially I have a large open channel that carries the 10- and 50-year storms, then a large swale parallel to the open channel to help convey the 100-year storm. However, the swale cannot extend past our property, so we are looking at putting in a very large pipe to move the water from the swale into the main channel. I have a HEC-RAS model from the county for the main channel, but I'm guessing HEC-RAS cannot model the dead-end swale + large culvert. Would SWMM work for this? Or do you have any other ideas for how I could model the water surface elevations? The overall goal of the project is to mitigate for a big mound of dirt next to the main channel. Widening / improving the channel is not really an option.
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