Might mean (unverified): Initial rainfall washes away pollutants.
Definitions Related words Mentions
We found 2 dictionaries that define the word first flush:

General (2 matching dictionaries)
  1. first flush: Wiktionary
  2. First flush: Wikipedia, the Free Encyclopedia

Definitions from Wiktionary (first flush)

noun:  (horticulture) The first growth of buds, flowers, seeds, or whatever is harvested from a plant.
noun:  (by extension) The beginning; the period of time when something is first starting.
noun:  (wastewater management) The flow of wastewater at the start of a storm or season, when runoff has the highest concentration of pollutants.

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