@farmerman,
SE Australia copped the worst of the prolonged drought (Victoria, South Australia & parts of NSW) ...
I can't say with too much authority what other states are doing to ensure long-term water supply, but in Victoria the state government is in the process of building a (hugely expensive, short & long-term) desalination plant for an ever expanding Melbourne, via a private company. We aren't privy to all the details of the deal. But water is going to become very, very expensive as a result.
Problem is, we used to have just one (state run & operated) water authority. But, under a previous zealous free market government that was broken up into a bunch of different corporations ... because, it was argued, this would be more "competitive". (Don't get me started!
Grrrrrr!)
Just this week there has been talk of the virtue of capturing run-off after heavy rains .... but I haven't come across too many details of the hows & whys & wheres.
I think it's fair to say that future planning appears to have been a rather haphazard process.
As to farming methods like dry farming, etc, I honestly don't know, farmer. Perhaps some of our Oz A2Kers who live in rural areas will be able to comment? Hope so.
I wish dadpad was around. I'm sure he could tell you a lot more about such things than this city person can.