A reserve day was built into the schedule for the knockout stages of the men's 50-over World Cup in England last year, and New Zealand qualified for the final by beating India in what was effectively a two-day match.
CA chief executive Kevin Roberts on Wednesday said with heavy rain in the forecast for the Sydney Cricket Ground semifinal doubleheader on Thursday, a call had been made to the International Cricket Council.
But Roberts said no such proviso is in place for T20 tournaments, meaning both Australia and England could be knocked out without a ball bowled. South Africa and India would play in Sunday's final at the Melbourne Cricket Ground after finishing atop their groups, meaning there'd be a first-time titlist.
India is scheduled to play England first on Thursday, followed by four-time champion Australia and South Africa.
"We've asked the question (on a reserve day)," Roberts told a Melbourne radio station. "It's not part of the playing conditions and we respect that. It gives you cause to reflect and think about how you might improve things in the future."
England captain Heather Knight said she was frustrated by the lack of a reserve day and perplexed by the different rules between the tournaments.
"It would be nice if we could maybe play it in (Melbourne), I don't know if that's feasible, it's probably not," she said. "If both semifinals are lost it would be a sad time for the tournament.
"I guess it's the same for the men's T20 World Cup. We did check that this morning. It is ... strange."