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The Jubilee River story - Afflux at Black Potts
You will need to know that afflux (from Google) - is the rise in water level (above normal) on the upstream side of a bridge or obstruction caused when the effective flow area at the obstruction is less than the natural width of the stream immediately upstream of the obstruction.
The image below taken in July 2007 clearly shows the significant step or jump in the water levels at Black Potts as a consequence of sub-standard design i.e. insufficient cross-sectional area.
For further technical details please see The Conveyance and Afflux Estimation System