flood devastation; damage from heavy rain
Refers to the destruction and suffering caused by torrential rain and subsequent flooding. Often used in news reports and disaster contexts.
Many houses were washed away in this year's flood devastation.
Recovery from the heavy rain disaster takes a long time.
水害 is a broader term for flood damage, not necessarily from heavy rain alone; 豪雨禍 emphasizes the cause as torrential rain.
Compound of 豪雨 (gōu, 'torrential rain') and 禍 (ka, 'calamity, misfortune').