If you take a walk along the river bank, you'll notice many of these huge majestic river redgums, some of which are very old. Unfortunately though, a lot more of them are dying at the moment, due to the drought and the fact that the river hasn't flooded its high banks for several seasons. This is partly due to low rainfall and partly due to irrigation, and there is a lot of debate going on at the moment about what can be done so more of these trees don't die. Throughout history, they have come to depend on the river flooding at least once every 7 years for their survival.
Now their exposed roots are even more exposed than usual, as the water has receeded further from the bank.