Low chord elevation at downstream side of bridge (ft/m)- Channel
The average elevation of the low chord (or lowest part of the superstructure) on the downstream side of the bridge over the channel.
This elevation (instead of the downstream water surface elevation) will be used to determine the elevation of contraction and abutment scour
when the downstream water surface rises above the elevation of the low chord.
Click here to see definition sketch of the low chord elevation