(1) The top of a dam, dike, or spillway, which water must reach before passing over the structure; in international usage it refers to the crown of an overflow section of a dam. (2) The summit or highest point of a wave. (3) The highest elevation reached by flood waters flowing in a channel as in Crest Stage or Flood Stage.
CREST
Meaning of CREST in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012