Not true mate, 2 major canals meet in the City centre, just at the back of Broad Street they have done up the canals and there are a few bars etc in very close proximity, I would say a lot more people hanging around them drinking than in Manchester.
In fact a friend of mine, decided he could jump the canal in full view of a packed beer garden, they all watched as he took out all his stuff and handed it over and proceeded to not even make half way the daft ****, he swam to the edge, got out but had somehow cut his leg open, so dripping wet took himself off to the hospital just down the road for a tetnis jab. This was about 15 years ago thinking about it and they have been done up since then.