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Yes "option" define Table. True that it don't show on the detailed output table (which is something weird).

You may want to check the attached document. http://files.engineering.com/getfile.aspx?folder=f826394a-3779-4e6c-91a0-f4196f5d6b1b&file=Stormwater_Collection_Systems_Design_Handbook,_p._18-13.JPG

Under "Channel Type" select "Enter Constant Tailwater Elevation" or a Rating Curve if you have different Elevation for different flow rate.

Thanks, for the information. We do ignore embankment scour as well. Just to mention: that flow rate of 10,000 fps is the 500-year storm (well 1.7 x 100-year).

The bridge is cutting a floodplain and there's a significant increase of velocity between the approach and the bridge. I just thought it was overly conservative but you bring good point by saying that the scour will be filled back in. I'm just keeping it back before sending it to Structural...

Sorry! 10,000 cfs hehe

The bridge has overbank flow forced back in the river channel by the bridge approach embankments. Based on the Live-bed scour in the contracted bridge opening, the maximum scour depth is ... 15 feet. The D50 is 1.5 mm and the flow rate is almost 10,000 fps passing through an opening of 100...