Has anyone witnessed the devestation done to the banks of the murray river after a mob of cattle have been there to drink?

There is nothing special about the banks of the Murray River. Anywhere in the world that cattle or other cloven hoofed animals mass to drink the soil will be damaged, but if you look closely at herd behaviour, you will note that they return to the most easily accessed water every day, not constantly erode more of the bank. This is one reason why farmers pump water to troughs to water their animals.

The river banks should not be used as a boundary for domestic livestock. Proper fencing should be used, and sheep and cattle watered in apropriate manners. Not all farmers provide watering facilities for their animals when there is a river handy. Grazing of stock on properties bounded with a river frontage must be addressed by law.

Actually Jason you may find much of your concern addressed by the drought. Significant numbers of properties fronting rivers have had problems with wandering stock passing between neighbours, as where once was a natural barrier (water) recently there has been nothing (or little enough not to impede stock).

I have not, but I'd wager it's all part of the corruption necessary to retain the votes of the fools who exploit and live off it for all this time. You'll find every one of them are unapologetic and dismissive, much like the governments in eastern europe who ruined the Aral sea, or the Chinese government on it's own rivers.

Properties with grazing permits along the vic side of the Murray River, must be withdrawn. Fencing installed along their titled boundary. The whole area will have to be unweeded and re planted. After years of grazing nothing has been done by graziers to replace damage done to public land.