The phrase "a flood of speculation" is correct and usable in written English.
It can be used to describe a large amount of conjecture or theories about a particular topic or event.
Example: "After the announcement, there was a flood of speculation regarding the company's future plans."
Alternatives: "a surge of speculation" or "an avalanche of speculation".
But this scepticism has not stopped a flood of speculation on who might benefit most from Nisman's demise.
However, the incident resulted in a flood of speculation as to whether she would ever compete at the highest level again.
The incident has unleashed a political storm, and a flood of speculation: government loyalists, disgruntled intelligence officials, Hezbollah, Iranian spies and Mossad have all been suggested as potential culprits.
"There's been a crescendo in negative sentiment against the dollar, leading to a flood of speculation," said Brian Dolan, chief currency strategist at FOREX.com.
She released the single "Bow Down" through SoundCloud in March, causing a massive spike in plays (more than 1.5 million that day), and setting off a flood of speculation around when she would be dropping an album.
In October, Thorpe Park dropped the first hints of Brown's attraction, which was followed by a flood of speculation among fans.
It's barely been 30 minutes since the attack in Woolwich and already my Twitter feed is drowning in a flood of vitriol, speculation, racism and recrimination.
Like many tantalizing archeological finds, especially from Egypt, it attracted worldwide attention and a flood of energetic speculation.
Last weekend's much-heralded smooch between Russian sprinter Kseniya Ryzhova and her teammates, first Tatyana Firova and then Yulia Guschina at the track and field World Championships in Moscow, unleashed a flood of headlines, tweets, and speculation.
And the mini-series includes a scene in which the Ramseys, after a flood of bad publicity and much speculation that they are the only suspects, have dinner with two English television producers who say they want to present their point of view.
Outside Washington, a number of ordinary, nonpolitical Americans — influenced no doubt by the flood of speculation, innuendo and downright accusation they receive from the news media — seem to fear that the Kennedys have a long-term plan to monopolize power.
