An email to the Post from Riversdale volunteer Dawn Giles has showed the damage of Saturdays' storm on one tree in the historic property grounds.
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"This is what happened to our beautiful pine just outside the gate during the storm on Saturday. Not much of it is left," the email read.
Ms Giles said some 30mm of rain fell upon the grounds in only five minutes.
"I was on a PR trip to Berrima when Ros rang and told me the news and was amazed at what had happened to the tree."
Do you have any photos from Saturday's downpour?
Send them to editorial.goulburnpost@fairfaxmedia.com.au with the subject line: Saturday's storm.