"heavy flood" is a correct and usable phrase in written English.
It is typically used to describe a large amount of water that causes damage and destruction. Example: The heavy flood swept through the town, destroying homes and businesses in its path.
Exact(9)
Still, there was heavy flood damage, especially in areas below sea level like New Orleans.
The urban context and form adjacent to the study area then inherently accentuates heavy flood risks.
Heavy flood waters swamped not just Louisiana but also southern Mississippi.
One town was cut off entirely, and highways were shut down by heavy flood waters.
There, strong waves broke over the seawall, and caused heavy flood damage to some of the town's old buildings.
On 6 November 1997, a heavy flood devastated several neighbourhoods of the city, causing the deaths of 21 people and devastating the property of hundreds.
Similar(51)
Heavy flooding is common.
In 2013 Passau experienced heavy flooding that caused extensive damage.
During heavy flooding the river sometimes changes its course.
"Over the last week the first rains have caused heavy flooding.
In January 2009 heavy floods in central Mozambique forced 50,000 people into resettlement centres.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com