Montreal declared a 48-hour state of emergency on Sunday but has extended it to five days.
More than 130 communities in Quebec have been hit by the flooding, with some 700 people forced to abandon their homes.
The man was driving with his 2-year-old child in the Gaspesie area of Quebec when powerful flood waters pushed their vehicle off the road, said Scott Bardsley, the spokesman for the Public Safety and Emergency Preparedness Ministry.
Across Quebec, almost 1,900 homes have already been flooded across 126 towns and cities, CBC quoted authorities as saying.
"The situation won't improve overnight, " said Quebec Public Security Minister Martin Coiteux.
"We will follow the fire department and actually remove the people if need be", Gruenwald said. Were looking at potentially getting frost in our area and thats a big issue for us, he says.
The downpours are expected to continue throughout the weekend as a massive weather system of persistent heavy rain steadily drenches the east and centre of the country.
More than 1,200 Canadian troops have been deployed to help with rescue and flood prevention efforts. "I would feel the same, even some anger, if it were my home being affected the way I've seen certain homes being affected".
Environment Minister David Heurtel said there were "encouraging signs" in the Outaouais region, near the Ontario border, where water levels are rising more slowly than before.
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New evacuations were ordered in Pierrefonds, on the northwestern shore of the Island of Montreal, after three temporary dikes ruptured, quickly sending water levels higher.
Coderre said earlier Sunday the city has 30 Canadian Forces personnel helping firefighters and other emergency responders with the flood response.
Premier Philippe Couillard toured Quyon, a Quebec town that borders the Ottawa River, and applauded the sense of solidarity, community and volunteering in the community.
Environment Canada said Montreal usually sees around 80 millimetres of precipitation in April, but this year, nearly double that amount fell on the city.
He says the Wynne government asked for "additional flood mitigation resources" to help in its battle against the flooding.
Some federal employees were being advised not to go to work on Monday because of the flooding.
The floods, she said, have allowed her to get to know her neighbours.
While the deluge has tapered off in the province, New Brunswick's St. John River is spilling its banks, prompting several road closures.
Meanwhile in British Columbia, two men remained missing as flooding continued to plague the province's Interior.