Thanks @outlander and @Former-Member .

I have vast ammounts of rock at my farm, not many smooth river ones though.  I built a fairly low rock wall when I first got the place and was quite surprised when it showed up on satelite maps.

I think as usual with the rain its a bit hit and miss.  It's nice that it has fallen out west though.  I'm just south of Sydney and its been a very hazy week or so.  The firies and volunteers do an amazing job of keeping control of the fires when they can.