Maximum height of the water onshore observed above a reference sea level. Usually measured at the horizontal inundation limit.

Runup is the height of the water pushed onshore (above normal sea level) after a tsunami.

The rush of water up a beach or structure, associated with the breaking of a wave. The amount of runup is measured according to the vertical height above still water level that the rush of water reaches.

a substantial increase over a relatively short period of time; "a runup in interest rates"; "market runups are followed by corrections"