The driver of the boat, Matthew Gibson, had no UK-recognised qualification despite having five years' experience as a ski-boat driver. Staff said there was a "lax" attitude to health and safety.
The court was told how parents of some of the children were watching from picnic tables when Mari-Simon fell into the water. Two of the witnesses leapt into the river after failing to get Mr Gibson's attention. The driver later told police he did not see the girl fall in. He said:
I turned the boat around and she went under.
More top news
Public services union Unison says it will nominate Jeremy Corbyn in the Labour Party leadership contest.
Google search now shows you when businesses and attractions are busiest.
The planning application said the museum would be dedicated to celebrating the achievements of East End women. Residents are very angry.