Angelika Maier wrote:We have this terrible drought right now and sheep are dying of starvation. I think they are so desperate that they damage the paddock beyond repair, digging out the roots. Farms are pretty big here but there is only sheep paddock and very little vegetation. Farmers don't even have gardens or some chooks or an orchard. I wonder apart from the better holding of water on properties could you actually make rain by planting more trees? Farmers complain a lot and it is probably very hard for them, but they do not change the practices.
Planting trees in quantities large enough to make a difference will require willpower at the scale of the nation. You do not indicate how much yearly precipitation you get, just that you are in Australia zone 10, which is pretty darn tropical. (I'm in zone 4b, Central WI.)
So armed with that, I looked it up. There are regional differences, of course "Coastal areas of Queensland, Northern Territory, and Western Australia often experience upwards of 1,500–2,000 mm, with some areas exceeding 3,000 mm (120 inches)."
By comparison, I get and average of 31-32" per year.
So it appears to me that you are not so much low on annual precipitation, but you appear to have a very wet and a very dry season.
Your solution might reside in holding on to the water that you do get. Building underground cisterns like my great grandma had under her house might be your salvation. It would at least allow you to have ample water for you and your animals, maybe even a nice garden?
In the south of France, a whole village would build a cistern for the town and carefully meter that out.
It is not perfect but it's better than having starving sheep
I remember looking up the number of gallons of water you can collect from a regular sized roof. I almost fell off my chair!
"One inch of rain on a 1,000-square-foot roof produces approximately
600 to 623 gallons of water.
and that's just one inch of rain! A cistern can be made of a septic tank or several that are joined. A normal septic tank is about 1,000 to 1,500 gallons so with barely one inch of rain collected from a roof, you are already more than half way up a septic tank full.
The Romans would build their house with a central patio and instead of having the rooves shedding water away, they would have it collected in the middle and down to a large cistern that was mostly covered to prevent bugs and other critters. But, you know, the Romans were really pretty good with that kind of construction!
You did not indicate what sort of soil you have and if it would pay to excavate swells and berms, but if you have more clay, that might help too.