I can't see anything amiss with using 'dump' in such a context. One meaning of the word is 'to put down heavily', which sums up heavy falls of rain/snow/whatever. Perhaps it would have been more correct to have said 'was dumped'? My apologies for mangling the language. I'll have to check my records, Rosie. Unfortunately I took the trouble to transfer my data from notebooks to a computer spreadsheet program and promptly lost it all when a hard drive failed. Naturally gubbins here hadn't got around to backing up the files. There were about fifteen years of it and I've not had the inclination to do it all again. I'd have to find the notebooks, too (no doubt they'll be in a 'safe place'). I'm about the same distance from Sydney as is Richmond - 80 Km/50 miles - but with about 1000' extra elevation and 30 Km south-ish.
Further to that lot, Rosie, if you are interested then look here for information on current Sydney dam levels. The bit found here includes a small reference to Goulburn (I could drive there in less than an hour and a half - I think). It's not quite up to date as the town has tapped the aquifiers and is using 'grey' and recycled water quite extensively. Strange though it may seem, much of the recycled stuff is used for keeping the sporting fields operational - combined with water carted in to the town (at some considerable expense to the clubs involved). I won't bore (sorry) others on this site with useless chatter, I'll send an e-mail in the next few days. I noticed that London is expecting well over 30°C today (Sunday) and will ask you a couple of questions about it. That sort of reading is becoming seriously warm.
[Dujon] There's nothing grammatically wrong with using the word "dump" in that way - it's just highly amusing to those of us with the minds of small boys. Maybe Australians don't use the word in - ah - that sense? I'm most surprised!