Huge gullies that open up suddenly, swallowing homes and businesses, are advancing at a worrying speed, warn experts.
Canyons like this are known locally as “voçoroca” or “torn land” in the indigenous Tupi-Guarani language., one of the most aggressive forms of soil degradation caused by rain and waste water.This was once a bustling street in Buriticupu, a city in north-east Brazil.Canyons like this are known locally as “voçoroca” or “torn land” in the indigenous Tupi-Guarani language., one of the most aggressive forms of soil degradation caused by rain and waste water.
He was knocked unconscious and woke up at the bottom of the ravine three hours later. After a complicated rescue operation and months of convalescence, he can now walk without crutches.His experience is a vivid example of the risks facing Buriticupu’s 70,000 residents. This type of erosion threatens fertile agricultural land in some parts of China, the US and Europe too.There are no official statistics for gully-related deaths, but the authorities in Buriticupu say gullies have swallowed up at least 50 houses and some residents have had to abandon their homes, leaving neighbourhoods deserted.
In the 1990s the timber industry was booming here. There were more than 50 sawmills working 24 hours a day. Twenty years later, most of the city's native vegetation was gone. He and his colleague Jean Poesen analysed data from more than 700 gullies around the world and concluded that if extreme rainfall increases by that amount, it could double the risks of gully erosion.
The public prosecutor’s office for Maranhão state is taking legal action against the city of Buriticupu, saying it has not carried out plans that had been agreed.
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