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Noun: afflux  'a,flúks
  1. (hydrology) the rise in water level (above normal) on the upstream side of a bridge or obstruction caused when the effective flow area at the obstruction is less than the natural width of the stream immediately upstream of the obstruction
  2. [archaic] A rush of fluid or gas
    "an afflux of blood to the head"

Derived forms: affluxes

Encyclopedia: Afflux