Unbuilt Britain

Does anyone have information regarding the effects of the Thames itself if these projects were carried out such as increasing the speed of the river flow downstream or if it would dissipate the build up of silt thus negating the need to dredge?
In the event of wastewater treatment failures, the North Sea would become unpleasant but the Thames might stay OK.

Worse, disturbance of the Thames estuary could destabilise the sunken ammunition ships, leading to some major issues and possibly a very large explosion.
 
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