Their discharge has grown by a factor of ten within 24 hours.
The discharge of Geithellnaá was over 480 m3/s at noon 28th Dec., probably the greastest since 1971. The older maximum was 454 m3/s 31.10.1980.
The discharge of Fossá has now exceeded
220 m3/s. The last time it exceeded 200 m3/s was 29.12.2006 but the Fossá river maximum also occurred 31.10.1980, i.e. 395 m3/s.
River discharge
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