The phrase "a flood of protests" is correct and usable in written English.
It can be used to describe a large number of protests occurring simultaneously or in quick succession.
Example: "After the controversial decision was announced, there was a flood of protests across the country."
Alternatives: "an outpouring of protests" or "a surge of protests".
Our article on Lyme disease prompted a flood of protests from readers who said the condition is not "in their mind".
The strike, which began the day after Labor Day and forced school closings two days later, has spurred a flood of protests from parents and students in the primarily blue-collar suburb of Trenton, particularly from high school seniors worried about college admissions and delayed graduation.
The station's impending shutdown was announced in 1926, but it was saved by a flood of protests from citizens who relied on the service.
Since the Iranian authorities have cracked down on the demonstrations that rocked the country after a disputed election a year ago, a flood of protest music has rushed in to comfort and inspire the opposition.
But last Friday, Amnesty International declared Mr. Montiel to be a prisoner of conscience, provoking a flood of protest letters to the Mexican authorities.
I know this will bring a flood of protesting e-mails, but fishing from a boat is like watching grass grow.
The second wave of attention to the photo was an internet flood of protests -- "Leave the dead their dignity!" people wrote, "Show some respect!
Bloomberg faced a flood of criticism and protests in the spring when he proposed axing more than 4,000 of the city's teaching jobs.
(A scheme to set up an 11km cable car capable of whisking 1,000 visitors an hour up to Son Doong was initially supported by the government but, after a flood of local and international protest, is on hold – for now).
The result were protests, a flood of court cases, violent riots, a worsening economic crisis, and a two-week period in which Argentina had five different presidents.
The flood of protests over the Keystone XL pipeline should persuade President Obama to reject this dangerous venture.
