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The Jubilee River story - Uneven flood walls at Black Potts

I keep asking myself why the two sides of the channel upstream of the Black Potts railway viaduct are protected by raised walls of different height?  Yet another cost saving suggestion maybe? 

The flood water was supposed to be retained within the channel (on the Datchet side) - Atkins Ltd – Jubilee River Hydraulic Review – July 2004.

As can be seen from the previous page, the lower flood wall on the Datchet bank enables flood water to leave the channel and overwhelm the public footpath at a very early stage in the flood event. The higher wall actually prevents flood water from flowing through unused arches on the Eton bank

The small and enlarged images below (January 2008) record the differences in height of the two walls.

Please see enlarged images below: