The phrase "rainfall intensity" refers to how heavy or strong the rain is coming down from the sky. It measures how much rain is falling within a specific time period. Full definition
A one per cent increase in rainfall intensity is estimated to result in soil loss from crop lands by 1.5 per cent. (chimalaya.org)
The analysis demonstrated a decline in rainfall intensity, despite an increase in total rainfall over the years. (sciencedaily.com)
Work by researchers from Taiwan and China found that the increase in rainfall intensity over the past three decades has been an entire order of magnitude greater... (newscientist.com)