Another aussie here. South Australia (driest state in the driest nation)
When I see clips like this I think......"wow look at that wonderful lush green grass" and "wow look at that great soft WET soil".
You would need a jackhammer to make a video like that in some of our parks. The southern states have been in drought for 10 years now, and a fair bit of that time water restrictions has stopped the watering of most pubic parks, with the exception of few parks and ovals. Hard dirt with dead grass is the norm for me, some parks are better though.
I think that as long as you leave the place as you found it, and no one could notice you have been there, and the grass doesn't die....you've done a good job.
You are very lucky if you hunt a park like this lush.
Cheers