Deflection Dams May Be Built to Divert Lava from Roadway Skip to content
Meradalir eruption, August 2022
Photo: Golli. Meradalir eruption, August 2022.

Deflection Dams May Be Built to Divert Lava from Roadway

The Department of Civil Protection will likely build deflecting dams to prevent lava from flowing onto Rte. 427, RÚV reports. Also called Suðurstrandavegur, this road runs along the south coast of the Reykjanes peninsula between the municipalities of Grindavík and Ölfus.

Lava has yet to start flowing out of the Meradalir valley, but scientists say it’s just a matter of time. At time of writing, the lava around the low-lying mountain pass called Meradalaskarð had reached a height of eight metres [26 ft]. Should it rise a mere metre or so higher, however, it will overflow the valley. On Wednesday, scientists estimated that this could happen over the course of a few hours, but so far, the lava level has been rising slower than anticipated.

See Also: Lava Could Reach Reykjanes Roadway If It Rises Any Higher

“The lava’s been flowing in other directions since we got this tongue, which has actually reached the pass where it can start to flow out of Meradalir,” explained Kristín Jónsdóttir, the Met Office’s team leader for natural disasters. “And, of course, the way the lava flows is random. Tongues are breaking off from the lake of lava and what we saw yesterday was that the lava was mostly flowing in the immediate vicinity of the crater, mostly to the west and the north.”

But currently, it isn’t possible for scientists to say whether the lava will overflow the valley “tomorrow or in a week,” said Kristín.

Plan to divert lava from fibre optic cables, important infrastructure

Diversion dams are only temporary measures, added Björn Oddsson, a geophysicist with Civil Protection. But experiments erecting these barriers in the path of oncoming lava were successful last year and as such, Björn expects that “the engineers and designers who are working on this will make use of [this experience] and will resort to [diversion dams] if the lava starts to flow toward Suðurstrandavegur or fibre optic cable or other things we want to divert it from.”

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