Distance From Left Edge of Water to Left Abutment Face (Spill-through Slopes Only)

Leave this cell blank for vertical wall abutments. The table below can be used directly for vertical wall abutments because the setback is measured to the face of the vertical wall abutment.

For a spill-through abutment slope, enter the horizontal distance between the abutment face and the intersection of the water surface with the spill-through slope. If the water surface elevation is above the spill-through slope so that it reaches the abutment, leave this cell blank.