of the glacier, confirmed a steady water level increase that indicated the onset of a jökulhlaup (see
top part of graph). Measurements between 2 and 3 PM on Oct. 31 indicated a discharge of 143 m3/s (cubic meters per second) and the water was confined to a narrow part of the channel. Between 9 and 10 AM on November 1, the discharge had increased to 455 m3/s, filling most of the river channel
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