bore, tidal—A wave of water having a nearly vertical front, such as a tidal wave, advancing upstream as a result of high tides in certain estuaries; a similar wave advancing downstream as the result of a “cloudburst,” or the sudden release of a large volume of water from a reservoir. The bore is a hydraulic jump in that it represents the limiting condition of the surface curve wherein it tends to become perpendicular to the bed of the stream. Tidal waves are also called “eagres.”

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Source: NSPS “Definitions of Surveying and Related Terms“, used with permission.

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