[WillyHeckaslike]

There is a drawback to river dredging, it is a double-edged sword which played a part in the flooding of central London in the 1920s. The drawback being that the tide is mightier than the river and while river dredging allows river water to flow out easier it also allows seawater to flow in easier too when the tide turns. An incoming tide on the back of a storm surge can cause much flooding and misery which can be compounded by other weather factors when they act in unison. The Thames Barrier was constructed to mitigate against this happening but it has its limitations and while London can be thankful for it other rivers are not so fortunate in being protected to the same degree.