Low chord elevation at downstream side of bridge (ft/m)- Left Overbank
The average elevation of the low chord (or lowest part of the superstructure) on the downstream side of the bridge over the left overbank section.
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