Múlakvísl river level could rise as gas pollution remains high

Water conductivity in the Múlakvísl river has risen steadily in recent days and is now unusually high for this time of year, mbl.is reports. The readings indicate that a small glacial outburst flood is under way.

The Southern Iceland Police said the conductivity measurements, which indicate the amount of geothermal water in rivers, had recorded a high value in Múlakvísl.

The river level has not yet risen in line with the increase in conductivity, but it could do so over the next few days, the police said.

Outbursts of this size are not unusual in Múlakvísl, but the current event has been accompanied by unusually high gas pollution. Hydrogen sulphide levels exceeded health limits overnight, making it inadvisable to stop near the river or its sources at the edge of the glacier.

The gas is heavier than air and usually settles in depressions. It is odourless and dangerous to human health. Anyone experiencing irritation in the eyes or nose should leave the area as quickly as possible.

According to the Icelandic Meteorological Office, the high gas pollution is caused by the flood containing little meltwater. Instead, it is the result of a geothermal leak, meaning the water contains a higher proportion of dissolved geothermal substances than usual.

The water volume itself currently poses no danger. The main warning concerns the gas pollution.