floodwater

noun

1. (countable, uncountable)The water of a flood.

   “European adventurers found themselves within a watery world, a tapestry of streams, channels, wetlands, lakes and lush riparian meadows enriched by floodwaters from the Mississippi River.”

   “South Yorkshire 2019: The track at Conisbrough is deluged by floodwater. Lines were shut and services were disrupted across Yorkshire and the East Midlands.”