Sydney had heavy rain from daybreak and Murrihy said on announcing the postponement that the Sydney rain radar for the remainder of the day looked "horrendous".
"That's exactly how it played out - it poured all day."
The postponement will conservatively cost the club upwards of A$1 million, but everyone agreed that had racing begun the chances of getting through the entire 10 races safely were close enough to zero.
Surface water would have quickly become a major visibility problem for jockeys.
"I can't see it coming back to better than heavy," said Logan. "The inside of the track this morning was still under big lakes of water."
Which spells almost certain bad luck for Volkstok'n'barrell and good luck for fellow New Zealander Mongolian Khan, who appears well able to handle a wet surface and, more importantly, loves a dour fight, which the Derby is certain to turn into under these conditions.
"We really don't know if our bloke will handle the conditions or not, but there's only one way to find out - hit and hope," said a resigned Logan.
The Chris Waller-trained Preferment is the one to beat in the Derby.
He looks a more complete racehorse than the 3-year-old who won the tough Victoria Derby in the spring.
His close second to Volkstok'n'barrell in the 2000m Rosehill Guineas showed he is right on target for this more defined staying test.
Well-backed Hauraki has no form on wet footing but two other outside prospects, Ruling Dynasty and Omeros, do and must be rated as trifecta hopes.
Spare a thought for jockeys Corey Brown and Craig Newitt. Both rode at Singapore on Friday night then rushed to the airport for an overnight flight to Sydney to ride on Saturday.
After their fruitless trip the pair flew back to Singapore on Saturday night to ride there yesterday and made that same rushed trip to the airport last night to return to Sydney for today's meeting.
That would be brutal under any set of circumstances, but Brown's task was made horrendous by being required to ride in-form Suavito at 50kg in today's A$3 million Doncaster Mile.
Brown allowed himself a small piece of fish in Sydney on hearing of Saturday's postponement and said the one saving grace was that each of the flights allowed him time to sweat off 1.5kg on arrival in each country. "That saves you from being dehydrated for 24 hours."
Weather woes
*Trainer Donna Logan has no idea if Volkstok'n'barrell will handle the heavy track at Randwick today.
*However, fellow Kiwi Mongolian Khan is likely to be suited by the conditions for the Australian Derby.
*International jockeys Corey Brown and Craig Newitt flew back to Singapore on Saturday night to ride there yesterday after which they headed to the airport to fulfil their engagements today.