My lad went to uni in York and just before he went students were ending up in the Ouse with alarming regularity - I don't think the Mrs slept for the first month because of some of the states he used to come home in.
As did I. It's not that surprising though when you've lived there, walked the rivers edge and seen how people behave around the river.
Pissed up folk show off and walk along the bridge walls, take shortcuts down towards the millennium bridge where there is very little lighting, a couple of rat runs along behind the Park Inn hotel and regular flooding catch people out. Not to mention people often go for a swim in it further down, which is fucking daft.
I knew people affected by some of the people that passed away in the rivers, some seemed to highlight mental health states and personal choices, whilst others weren't satisfied and thought foul play. Though it was regular in the press (used to work in Sainsbury's there) that people would look for their 'way out' by jumping in.
It's all common place, and I would think that the same for canals and other Cities.