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I've never used FLO-2D but have seen a few example setups, so prefer HEC-RAS from a familiarity aspect. Also, the state DOT wants files in HEC-RAS format as a deliverable for their use.

I agree with the flooding comments, and as part of the scope the replacement is required to maintain or lower the flood elevations. It already floods at a 10 year storm which is really his own fault for building in the flood plain. It did give me some fairly exact storm/water elevation...

Is this a 3-sided or 4-sided box? If 3-sided I would recommend cast in place footings and knee walls to keep the box at the higher elevation, unless it is designed for the loss of height. Also, the stream elevation may lower due to contraction scour which may help with this. On the other hand...

SLOCivil, One thing to note is that the HEC-RAS scour function does not take into account the latest changes to HEC-18 so it may be best to do a hand calc for your scour. It isn't really a very long calc but you want to make sure that the proper provisions are used. I recommend you look at...

All, I have a unique situation that I am trying to model. Looking at a culvert replacement that has a sharp bend downstream with most of the inner point bar region in the floodplain. This results in flows going over the floodplain during large storms as well as in the meander bend. In...