Abutment setback (ft/m)

Setback is the horizontal distance measured from the channel bank or edge of channel to the abutment: When the overbank sections are relatively small, and where the channel is likely to move laterally within the structure, consider analyzing the flow as being all channel flow without overbank sections. For this case the setback is zero.

Click here to see a definition sketch of setback for an abutment

Click here to see a definition of setback for a bottomless culvert