"major floods" is a perfectly correct and usable part of a sentence in written English.
For example, you could use it in a sentence like: "In 2013, the region was devastated by major floods."
Katrina Kremer, a doctoral student and the study's lead author, was conducting seismic soundings, searching for thin sediment layers that might be evidence of major floods.
The major floods are destructive, of course.
There were 16 major floods in Houston's first century.
Damanik recalls how the fish catch plummeted and major floods swept away entire villages.
"The inshore area is still recovering from major floods we had in 2010 and 2011.
In response to the major floods, they extended and raised the levees.
Major floods occur in some coastal locations as nearby oceans get warmer.
And in Fargo, the city has prepared for major floods year after year.
In 2011, major floods hit Thailand, setting off panic among investors.
Almost all of our major floods in California correspond to these atmospheric river storms.
