There's a rather nice photograph on the above blog of children being rescued from the upper floor of a Rotherhithe home during the 1928 flooding.
I've attached a small copy but go to the above page to see the large image.
There's an article about the flood on Wikipedia, which describes the flood as "disastrous". Fourteen people drowned when the Thames flooded its banks, and thousands were made homeless. It was apparently caused by the sudden thawing of snow in the Cotswolds, which doubled the volume of water in the river.