the.com/freshet

the river's adolescent growth spurt, swollen with snowmelt and bad decisions

means A sudden rise or overflow of a stream, usually caused by heavy rain or melting snow in spring.

from From Middle English, built on "fresh" — the same word for unsalted, newly-arrived water. A freshet is literally a gush of fresh water, the spring meltwater flooding into rivers and out toward the sea. The "-et" is a diminutive-flavored ending, so the word carries a sense of a little fresh outpouring, though the floods themselves are anything but little. "Fresh" traces back to Old English "fersc" and Germanic roots, a cousin of the same family that gave German "frisch."

origin
From 'fresh' — meltwater diluting salty estuaries
timing
Spring snowmelt and heavy rain trigger it
power
Carves channels and reshapes floodplains overnight
old usage
Once meant any small freshwater stream
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