freshet(redirected from Ice freshet)
Also found in: Dictionary, Thesaurus.
a comparatively short and aperiodic rise in the water level of a river occurring as a result of the rapid melting of snow in a thaw, the melting of glaciers, abundant rainfall, or the release of water from reservoirs. Unlike seasonal high water, a freshet may occur at any time of the year. If a freshet occurs because of a rapid increase in the discharge of water in a certain segment of a river, it rapidly spreads downstream at up to 5 km/hr in rivers on level ground and 45 km/hr in mountain rivers. The height of such a freshet usually decreases downstream, but its duration increases. A large freshet may cause a flood.