The 1971 breach was the reason the Bridgewater Trust was formed, which was a "get together" of all the councils in the area which the canal ran through. Manchester, Salford, Wigan, Trafford, Warrington and Halton (as it is now, not sure what it was back then) which came up with the funding for the restoration.
Although the breach took 2 years to fix back then, The actual ground works only took 8 months, the rest of the time was taken with sorting out who's paying for what, and probably a lot of arguments embetween.
Of course the Bridgewater Trust is still in existence, I beleive, but the money to fix it this time is, I've heard, coming through a rather large insurance claim! And of course the delay will be a knock on effect of that, and with all the rest of the H&S etc that goes with it.
If you're a Bridgewater license holder you would have received a letter through the post from the Bridgewater Canal Co with information on the breach, confirming that they will be repairing it and the appropriate time frames for the work.