Touche - you ride my route !
I've been in touch with Edinburgh Park Management about this for over two years, and the the council is being as effective as only the City of Edinburgh Council can be. They are making excuse after excuse to EPM and blaming red tape that doesn't exist.
There are a number of other high-ranking people from Edinburgh Park now also getting stuck into the council over the issue. I'll try and remember to PM you some of the details tomorrow when I'm back at work.
It's a right bloody hazard now as you point out; the submerged rusty, sharp metal back of a washing machine will slice anyone open should they hit a submerged rock and fall in. Now that the metal fence has joined it, the cones, the polystyrene chunks, the guttering pip etc it's a veritable slalom.
If we shout loud enough in the meantime, we might get the council to come and dredge all the crap out of the water again (they did it over a year ago to try and placate EPM for a bit longer)